czcams.com/video/_gYCaLDKxNY/video.html I've got you beat. I am the greatest in the world, and the only man in the world that can convert four stroke engines to two-strokes retaining the stock piston/rods/crankshaft. My family made them in 1910, the 'Roberts aluminum boat/aircraft two stroke.' You are wrong. Cylclic dispersion takes over. Small port two strokes run exactly like four strokes when run rich. There's a four stroke combustion schedule in fast two-strokes. Try again..
I can honestly say I didn't learn a damn thing from this video, BECAUSE... I'm very familiar with most engines. I have studied and built two strokes for years and have always been amazed at the looks I get when trying to explain how they operate to those who are unfamiliar. Every time I thought there was going to be something you left out, you covered it 3 seconds later. Hours of my life arguing over this same subject in the past. I agree with everything you said and you explained it so well that I could have gone to some other video after 5 min but watched the whole thing anyway. Very well explained, keep up the good work.
This guy's brain is super charged. It must weigh 52 pounds. Hat's off to his mastery of the topic and his superb ability to communicate it in a manner we mere mortals understand. Genius.
done for years on snowmobiles, boondocker are making complete plug and play turbokits to ALL 2 stroke sleds, the upside with the new sleds are that they have EFI and have a lot more tuning capabilities. I've personally built turbo 2 stroke sleds, 2004 ski doo rev 800cc was my second turbo 2 stroke, my first was a 97 rotax 580, both carburetor engines. my biggest problem was jetting. and maintain a good air fuel mixture. I used adjustable powerjets so I could rejet on the run, when there was a temperature change or altitude change. otherwise a completely stock engines, pipes and so on. on the 800cc I had to change reed blades to handle the extra flexing caused by the boost. let's take the rotax 800cc etec for example, 150 stock hp, 2 cylinder, with 5 psi boost by a turbo, and it gets around 200hp on crank, a bit less on the track(wheel). some Swedish students turbocharged a AM6 50cc to 30 hp and they also turbocharged a yamaha tzr 125 with stock engine, and doubled the power. my experience with turbocharging 2 stroke engines that uses carburetors are a pain in the ass to jet, and to make it work 100% all the time. if anyone wants to turbo a 2 stroke, go foor a EFI fueling setup, ecotrons.com have EFI kits for most engines up to 800cc, and you'll save a lot of time on the tuning part, because that's where the problems start ;)
I turboed my switchback assault, the boondocker 2860 turbo is actually to small for 800cc in my opinion. I went for a 2873 kpa turbo, it was so much better for temps over all, cooler engine, more fun on higher boost etc. Had that sled for years with no issues, engine took it well, was never under 10-11 psi. With the big turbo i went for 18.3 psi, that was a kicker, still no issues lol. 2 stroke turbo`s is so much fun, not hard to get right either with a little bit of knowledge or help. Today, kits and pull and go.
@@abccba2344 how many miles did you get out of that engine. Did u ever get to tear it downn to see what kind of wear and tear the turbo did to the engine
@@joshlaquerre3197 rebuilding an 800 costs me around 1k in parts. i have a 2013 m800, i converted to the alpha 1 suspension (video on yt), i put a speed works turbo kit on and im sitting around 230hp on the crank. i rebuild it every other year, like any good two stroke owner should do, and have no issues.
FYI - check out the McCulloch BP-399-T engine from the 70's, that was going to be for snowmobiles .. production was canceled, only a few were made .. it had a small piston opposing the main combustion piston/cylinder ... that small piston was used to pump / supercharge the fuel/air mixture and to also balance the motor. IMO, its almost as complicated and costly as a 4 cylinder 2 stroke, so why not just do that? 2 strokes are simple, adding parts and complexity is almost always a step backward.
There where more companies who where experimenting with this design. I have a moped which also uses this double piston design. The air pump piston has a very large diameter with a very small stroke. The piston is also ludicrously heavy to balance the system. Check out the Motobecane 99z engine. You can find photo's on internet of this engine. This engine was mass produced somewhere between 1976 en 1982 I think (I don't know the exact dates).
Thank you for putting that too bed for all of the naysayers. In the western US we have been running turbos on our 2 stroke snowmobiles for years and the performance gains are incredible, especially when you are talking about elevations from 6-14 thousand feet. They do work and they do work very very well. I have a skidoo summit 850 that is 165hp stock and at just 8psi boost it is about 225-240hp depending on elevation and fuel used and absolutely incredible. The funnest thing you can experience in my opinion.
Think it would work on my 1999 KTM EXC300? I’m 19 building a supermoto build with the ktm and my dad has a turbo laying around from when he did it to normal bikes. But do you think I could actually well put it together and turbo the ktm 300?
everyone's using the Detroit diesel 2 strokes as an argument for turboing 2 strokes, but those engines and gasoline 2 strokes are completely different. on the Detroit, the fuel doesn't go through the crank case, it goes straight into the cylinder through ports in the sleeve. you must supercharge them, or else the exhaust wouldn't be forced out and the new air/fuel wouldn't be forced in.
metallicakid83 correct and they are oil lubricated like a four stroke.dont always need a blower they made one way clutched turbos that would spool at idle until the exhaust would build up past idle and spool the turbos
metallicakid83 they only need a few psi of boost to idle till the turbos take off on exhaust.look up emd motors im pretty sure some detroits were only turbo charged to with no blower
To sum this up, the greater the difference between input pressure and ambient exhaust tip pressure becomes, the lower the efficiency of a 2 stroke will be. At no time is a 2 stroke sealed, to maintain any kind of reasonable efficiency it completely relies on equalibrium. Definitely the best explanation I've seen online completely correct with common sense included!
I can understand where you're coming from for 2 stroke engines I'm general, but for snowmobiles you'd be suprised how big of a market after market turbos are. On most modern 2 stroke snowmobile engines, 1 psi from a turbo is 7-8 hp and most engines will handle up to 11 psi on pump gas. So for most engines you will go from 150-160hp on a 800cc twin to 220-240 hp. You may think that's not worth it but it most cases where people use turbos it absolutely is worth it lol.
One of the big reasons to turbo a sled is altitude. Air gets thin at high altitude, so even with perfect jetting, the 150 hp your engine makes at sea level is knocked back considerably. With a turbo you can gather more of that thin air and keep your power.
Back in the 80's we used to "turbo the crank" of our 2 stroke motors. This consisted of machining deep groves on the outer edge of the crank flywheel to pick up more fuel mixture from the case like a fan blowing straight into the intake port. To this day I have no idea if it actually had any benefit, we thought it was pretty trick.
@@danielg6967 We didn't have access to a dyno back then, so any "difference" was measured only subjectively. Was it a significant night & day difference, no. That said, having a psychological advantage of my magic secret weapon did improve my competitive confidence.
the part you are overlooking in this video is the expeller of the turbo acts as a constantly fluctuating valve. it's rotatiomal movement, or lack there of creates the pressure in the exhaust pipe to cause the reverb of pressure back into the cylinder as the exhaust gas pushes on it's vanes... and the open, 2-stroke system is actually the better option for spooling a turbocharger, you can put a bigger turbo on a 2 stroke than a 4 stroke because it moves twice the air at a given rpm...
You're quickly becoming my favorite mechanical style channel. The simple fact that you give the TL;DR at the beginning for 5 seconds. Watch the rest if you want. You're informative, easy to understand, and funny at spots too. I love it. Cheers brother
I was just looking at some of the comments you get. OMG. You have the patients of a saint. Thanks for showing my bike. The 750turbo. I am a member of Lorcan's site.
Great explanation, I have been a 2 stroke mechanic since the late 60's, my father was a McCulloch dealer, raced go cart's and even set a track record in the single engine class at 127.5 MPH, the engine was only 5 cu.in. or 80cc. Turbo charging isn't worth the trouble, you are better of "stuffing" the crankcase (filling all empty space in the crankcase that you can, Now McCulloch had a prototype snowmobile engine BP-399 and a chainsaw BP-1 that used a balance piston to not only balance the engine but to draw more fuel/air mix in and compress it just that much more these engines put out insanely high power and RPM for their size. my BP-1 would turn 15K rpm and practically vibration-less. here is a video I found on the BP-399 that scares the daylights out of me because where on earth are they going to find a clutch that will stay together at 16,600 RPM? enjoy czcams.com/video/c7eTGDn8mmk/video.html
Back in the late 80s I had a tuned Honda VT250 (4 stroke) and that reved to over 12,000. There was a racing series in Japan, so you could get parts if you had money, it did blow up a lot though. I think I red lined at 13500 but that is from memory and with a lot of tuning parts and work.
Yet another person that doesn't get how a two stroke turbo works. I.ve seen over thirty five lbs of crankcase pressure with a turbo, never seen ten by stuffing.
its to bad that the two stroke engine is slowly dying out. love the sound of them. you learn us so much. wished there where more channels like yours. cheers
Main problem is they kinda stop developing them . Imagine if they put the same amouth of money in 2 stroke that company put in 4 stroke .... Direct injection could help a lot 2 stroke performance .
Chears matt. Great channel l understand how you feel. I worked for a company full of delboys with a delboy line manager. After paying to go to Australia for some experience (couldn't find any one willing in Scotland) and paying to go to college for two years to achieve two asme 9 qualifications and finish top of my class. I found myself in Fife welding copper boilers for a company(fantastic work) Unfortunately I only lasted 2 years before having a mini breakdown. This was due to the relentless bullshit, lies and fukin morons that I worked beside. To give you an idea, the company had a cad system, used the cad system on a daily basis, but my "technical" drawings came from Microsoft word with no measurements and not to scale. I've been working delivering pizzas on minimum wage since I left, and that was 3 years ago. I love fabricating and welding, but can't shake the massive dent in my confidence in the industry ( I worked a couple other places for a couple of weeks and they were the same sort of thing) If you have any advice I'll take it. (or a job) If not, I hope this helps explain why people like dell are a bad influence and shows the effects they can have on people as well as there chosen profession. FAKIN CANTS
Just curious. Not for a turbo but for a supercharger. Constant flow of it yeah, but crankcase seals on downstroke. Diverter valve from intake port to exhaust pipe. Would it help keep fuel mixture in cylinder if timed right?
Thing is a 2-Stroke is relatively simple, powerful and light, so adding a turbo to it seems like you don’t get a lot of pay-back? Now it is more complicated, more powerful and heavier. And as said they were being fased out because of emissions. To be honest the last time I rode a Turbo was the 90s, and it wasn’t fun on a motorcycle.
did you cover the pressure rise in the exhaust from the turbo. if your turbo provides boost it will provide back pressure. say a 1.5:1 ratio. if you have 10psi of boost youll have about 15psi of back pressure on the hot side of the turbo. youll get exhaust reversion with a turbo you wont piss away the intake pressure when the intake and exhaust ports are open together, you have the chance to fill you intake with exhaust instead. this is a good example oh a supercharged instance not a turbo.
I guess it depends On intake the piston scavenging may be enough to offset the backpressure of the exhaust On exhaust the chamber has just fired and it will be at even higher psi than the backpressure because it is so hot, blowing the backpressure and exhaust out through the turbine together
I'm 3 min in to this and I am very interested.. lol, thank you. I've subscribed. never learned motor works but like to pretend I can understand what all these # are.
@The Workshop It is supercharged. It has a volumetric effeciency of greater then 1. meaning it is able to process more then it's static displacement per revolution.
A similar thing happens with normal 2 strokes, although this is compounded when using a turbo system. This is called reed valve flutter and I'll go into more detail in the next video on this subject - good comment - matt
the way I see it, four-stroke engines have completely isolated intake and exhaust cycles, so you are free to add pressure to the intake (to an extent). In two-stroke engines, intake and exhaust cycles overlap, so if you add pressure to the intake, a lot of fresh air/gasoline mixture will rush out of the exhaust port (something that already happens to some extent in regular two-stroke engines)
This is why power valves became the choice for manufacturers to increase horsepower reliably. The part about increased heat and pressure forces the manufacturer to use better quality parts which increases cost.
I think you mean the Detroit Deltic (greatest engine ever) which had opposing cylinders and ports at the bottom of each stroke, detroit engines with one crank and a head would use valves 2 or 4 for exhaust and ports for intake
Great video, you didn't really explain the reflected pressure wave from the back of the expansion too well for anyone who doesn't understand it, but other than that good vid. I've lay in bed at night and wondered how it would go on a dirt bike but other that, too much fucking around to make it work well, like you say, and the best thing about a two stroker is simplicity and reliability....and they scream their tits off anyway! Leave it alone, mix up some fuel, tip it in the tank and try not to kill yourselves, how fast do you really want to go anyway! Peace bro ✌️
An excellent explanation of the basic pros and cons of 2-stroke turbocharging. A lot of the problems can be solved by having an exhaust valve instead of an exhaust port -- but that's more complexity, and the whole point of 2-stroke engines is to make as much power as possible with the least complexity possible.
It seems from your explanation that the biggest issue is the exhaust geometry? I think it’s a good rule of thumb to thoroughly research the tolerances of any engine before modifying it. I appreciate you taking time to explain to the average person what to expect when turbocharging a two stroke!
I'm seeing alot of 'Detroit Diesels are supercharged'. No, they are not. The blower is used as a scavenge pump to pull exhaust/ push air through the engine
Quite true, that was coming up in the next video to this subject, but you've beat me to it lol Technically is known as artificial aspiration. - great comment - matt
the first thing you said: can you turbo 2-strokes, yes. can it be down well, no. on that fact is a turboed snowmobile putting out around 160hp stock naturally aspirated. turboed they put out over 300hp. doubling your horsepower isn't good enough to be considered well? it's only the thousandth time I've heard some youtuber spurge bullshit on a topic which they didn't research well enough
The Workshop no need to even build it from there. because power is such a high priority for snowmobiles running at the high elevation the precision fit of the parts are much more spot on than a normal car. that's why 800cc produces 160hp
Interesting material, thank you! What if one based a turbocharged gasonline 2 stroke design on diesel 2 strokes, coupled with direct injection? I'm wondering (strictly on a theoretical basis) if it may be a good tradeoff of simplicity for more power and maybe improvement of some other properties?
I may have missed something here, but if you have a turbo fed by the exhaust, wouldn't you have a higher pressure built up in the exhaust as a result, negating the higher pressure differential you spoke of, and essentially turning the system into something resembling your bigger planet scenario?
Yes you can i have done it before. But they get hot so godamn quick. A/F is hard to understand on a 2 stroke. But if running on NOS you should add a little more oil to your gas.
Would it work on a PWC? My standard ratio of oil to fuel is 30:1 .... what would be the right amount now?...... would I want to have 10.7 - 11.7 afrs under load on pump fuel?.... I am thinking maybe even pump E85 which 9.7 (stoich) and 7.7 AFR under load with NOS.... any thoughts? Engine Longevity? Its just more brainstorming right now.... also now that you said the engine heats up it is concerning but detonation/knock would be more concern..... the engine is cooled from water flowing through exhaust and engine cylinders so I think water temp and ambient temp would play a factor there. E85 is supposedly better at preventing knock/detonation.... I just have to plan to best way like bigger fuel pump(s) bigger injectors ... fuel pressure regulator, NOS and special NOS controller w/AFR gauge.... and of course finding the right oil to fuel mixture..... 30:1 won't cut it lol
2 stroke engines are very temperature sensitive adding NOS always increases the combustion temperature due to the free oxygen. As for engine longevity - its only going down. Alot of the heat is transfered into the piston rings, even more so with NOS included, this is usually what gives up the ghost first. I have seen a couple of drag racers use thicker rings when running NOS to reduce things going tits up. As for premix etc I wouldn't know to be honest, although it don't think it would be too much of a problem. By the time the oil makes it into the cylinder its done most of its job with the bearings etc. Changing the premix ratio will have an effect on how stable the combustion is, and I don't know what chemical reactions take place with NOS and the oil itself. As for coolant and knock, the knock occurs during compression, the coolant has little effect with a system that is fixed. Coolant removes waste heat after the fact, and obviously from the power stroke previous. In other words you have to test the heat saturation of the cylinder/head before making any judgements out changing the coolant system. If the cylinder/head is too cool then this could cause condensation, which when running NOS would lean out the mixture. This would cause combustions temperatures to climb and then knock would occur. So you then cool it some more making it worse. - matt
What is the base fuel pressure for this 3 cylinder EFI 2-stroke.... is it the same as 4 stroke 43.5psi? Do you think a standard eBay type of fuel pressure regulator would suffice for measuring that set base pressure someone on the forums locally is having issues with hesitation and the like and I suggested 5 tips: 1)upgrade and Hardwire Fuel pump to relay (hardwire cause of voltage drop issues in electric pumps), 2) clean, replace or totally remove fuel pump's filter (fuel pump wasn't designed for oil/fuel premix, factory has a separate tank that injects oil but is removed cause of common recall issues), 3) have injectors sent out to be cleaned 4)Add fuel pressure regulator to keep fueling optimal for such a finicky particular 2 stroke engine design. I say that cause with carbs they were always picky on my goped and now with EFI premix is picky so setting base pressure or even increasing pressure could eliminate hesitation issues etc and allow to dial in/tune better. 5)Add AFR gauge and make sure its at least 10.7-11.7 AFR rich underload. Any thoughts?
I'm wondering whether the crank case tranfere system can be eliminated by directly feeding the charge in through the in let port by using the pressure from a turbo or super charger.??
great vid mate! i personally have always been amazed with 2stroke engines, my first vehicle was a 75 rd 350, there power production per cc in those days were unmatched, seems to me thou that a geared charging system rather than a turbo would be easier to deal with the expansion chamber issues. but after seeing what Suterczcams.com/video/0leUj-p43uU/video.html has recently done with the MMX500 engine ( with combustion chamber the size of the bottle i'm drinking out of ) putting out 200hp (and more now from what i have read) in a bike that weighs 280lbs, whats the point? i mean really, how much craziness can somebody handle? LOL czcams.com/video/O5NUEwwwtgs/video.html
This video is addressing the idea of a 2 stroke, there are other problems too, like reed valve stresses (fluttering etc) and others. With regards to the oil feed system, you can always just add an oil pump from a regular 4 stroke and have it belt, gear or chain driven off the crank - good comment though - matt (p.s - there will be a follow up to this and your point will be included, I can see there being load of questions from this video)
The Workshop if the premix can lube the crank, wouldn't the oily exhaust vapor be enough to lube the turbo? That's how expansion chambers work, in that they reuse the unburned vapor. thoughts?
lol no. The turbo requires oiling at the bearings within the turbo body where the shaft is. All you would do is oil the blades of the turbine, which would do nothing, apart from slow down the turbine slightly due to the weight. Expansion chambers use the high pressure combustion wave.
Since iam a faithful companion of your channel...... I have a request I'd like to know the ideal timing for minimal transmission wear when quickshifting my bike I can adjust delay and ignition cut timing Since you proven your skills I would really appreciate your opinion and explanation
I would make a kind of mech valve just after the exhaust port, and raise the inlet ports as hi as the exhoust maybe even further, then drive the turbo with a big brushes motor 3turn at 160 Amp
When you did your math on the ex pressure wave you did not account for drive psi? Witch would be 5-7 psi higher than you boost pressure. How does that play in to the reversion wave?
I have a question, in my 2 stroke the reeds are on the side of the cilinder and not on the crankcase so that difference in pressure that you talked about from the crankcase to the cilinder is not important anymore and so an engine like mine would make similar power to the type of engine you described, having similar displacement and all the rest?
So I'm planning on doing this on a 500cc virtical twin 2 stroke from a snowmobile making about 125hp , if I reduce my stinger Id, increase fuel, and put about 8 psi into the intake, is it realistic to go from 125hp to 180?
I imagine there could be some sort of effect on the turbine wheel absorbing the head end of the exhaust pulse, and sizing your turbine is probably pretty important to make sure to conserve as much of that pulse as possible without building excess backpressure, but this is interesting! And it certainly works in a very different way to 4-strokes.
Please correct me if I'm wrong but if you have a turbo before the expansion chamber wouldn't that be counter productive to boost, If the gases from the expansion chamber is putting back pressure on the turbine ?
"turbo before the expansion chamber wouldn't that be counter productive to boost" Why? Or should I say in what way? The exhaust gases exiting the cylinder are at there hottest and this means more energy. However, it also messes with any backpressure you would recieve from you exhauts system so would wouldn't run an expansion exhaust. It would also mean some tuning on a dyno to know where exactly yo stick the turbo to balance out the pressure waves
There is a 2 stroke v10 japanese diesel tank engine that is twin charged and they had a lot of problems while developing that engine. Its called mitsubushi 10 zf mod 21 which was in their early to mid cold war tank which i currently dont remember its name
Hello !!! Great lecture sir !😀😀😀 I'm building a double turbine for my motorized bicycle engine ( 4 stroke 66 cc ) , that I will install at the end of the exhausting sistem . Do you have any advices ??? Thanks in advance !!! All the best , Sorin / ROUMANIA
That crank induction is so cool! You would have more power in higher ambient pressure for the same reason you lose power on pikes peak. The number of moles of 02 that you can fit into the combustion chamber directly dictates power production. Displacement, forced induction and nitrous oxide, are all about burning more fuel. Also, rolling resistance is liner, so higher gravity is net positive (Eg: trains/trucks work).
Another thing is that a turbocharged goes on the exhaust first then exhaust fumes spin the turbine and then the air made with that goes in to intake, thous getting higher pressure in engine, which Would require to tune to run more fuel as well to even out the a/f ratio
I thought about pressurizing the air box on a two stroke using a muffin fan. Or even my 1200 bandit. We need to have flexible rubber windows so it can exhaust the extra air pressure outward or open inward to let more air in till it’s a balance between the pressure. Thinking about this more a twin throttle cable to operate the reastat to adjust the rpm of a muffin fan on the air box relative to the throttle position vs rpm. Porting the intake and exhaust on the cylinder would help too. How about doing a video explaining this I think the two stroke bike would be ballastic to ride.
Now that KTM is coming with EFI 2 strokes for 2018 won't it be easier with all electronics + a electronic port exhaust maby not 100% but 90% instead of 60% efficient? WITH A Variable TURBO?
Thanks for the vids,really open up my view on 2T engine.. Question,can u feed Nitro(NOS) to a 2stroke engine??what could ne the result,if Nos were injected after the carb or directly into tbe crankcase or any intake port??
So, it would work... but it's alot of work.... turbo weed eater go kart time!!!!😂😂
no way i was also thinking that
guess I'm putting a turbo on my weed Wacker
Use the turbocharged weed wacker to supercharge your snowmobile.
Don't forget the VTEC
Sure gonna win the hill climb if u slap n dab the wacker
czcams.com/video/_gYCaLDKxNY/video.html I've got you beat. I am the greatest in the world, and the only man in the world that can convert four stroke engines to two-strokes retaining the stock piston/rods/crankshaft. My family made them in 1910, the 'Roberts aluminum boat/aircraft two stroke.' You are wrong. Cylclic dispersion takes over. Small port two strokes run exactly like four strokes when run rich. There's a four stroke combustion schedule in fast two-strokes. Try again..
czcams.com/video/_gYCaLDKxNY/video.html
I can honestly say I didn't learn a damn thing from this video, BECAUSE... I'm very familiar with most engines. I have studied and built two strokes for years and have always been amazed at the looks I get when trying to explain how they operate to those who are unfamiliar. Every time I thought there was going to be something you left out, you covered it 3 seconds later. Hours of my life arguing over this same subject in the past. I agree with everything you said and you explained it so well that I could have gone to some other video after 5 min but watched the whole thing anyway. Very well explained, keep up the good work.
Cheers dude - welcome to the channel
1:00 that just looks like bong with extra steps
This guy's brain is super charged. It must weigh 52 pounds. Hat's off to his mastery of the topic and his superb ability to communicate it in a manner we mere mortals understand. Genius.
done for years on snowmobiles, boondocker are making complete plug and play turbokits to ALL 2 stroke sleds, the upside with the new sleds are that they have EFI and have a lot more tuning capabilities. I've personally built turbo 2 stroke sleds, 2004 ski doo rev 800cc was my second turbo 2 stroke, my first was a 97 rotax 580, both carburetor engines. my biggest problem was jetting. and maintain a good air fuel mixture. I used adjustable powerjets so I could rejet on the run, when there was a temperature change or altitude change. otherwise a completely stock engines, pipes and so on. on the 800cc I had to change reed blades to handle the extra flexing caused by the boost. let's take the rotax 800cc etec for example, 150 stock hp, 2 cylinder, with 5 psi boost by a turbo, and it gets around 200hp on crank, a bit less on the track(wheel). some Swedish students turbocharged a AM6 50cc to 30 hp and they also turbocharged a yamaha tzr 125 with stock engine, and doubled the power. my experience with turbocharging 2 stroke engines that uses carburetors are a pain in the ass to jet, and to make it work 100% all the time. if anyone wants to turbo a 2 stroke, go foor a EFI fueling setup, ecotrons.com have EFI kits for most engines up to 800cc, and you'll save a lot of time on the tuning part, because that's where the problems start ;)
I turboed my switchback assault, the boondocker 2860 turbo is actually to small for 800cc in my opinion. I went for a 2873 kpa turbo, it was so much better for temps over all, cooler engine, more fun on higher boost etc. Had that sled for years with no issues, engine took it well, was never under 10-11 psi. With the big turbo i went for 18.3 psi, that was a kicker, still no issues lol. 2 stroke turbo`s is so much fun, not hard to get right either with a little bit of knowledge or help. Today, kits and pull and go.
@@abccba2344 how many miles did you get out of that engine. Did u ever get to tear it downn to see what kind of wear and tear the turbo did to the engine
@@joshlaquerre3197 rebuilding an 800 costs me around 1k in parts. i have a 2013 m800, i converted to the alpha 1 suspension (video on yt), i put a speed works turbo kit on and im sitting around 230hp on the crank. i rebuild it every other year, like any good two stroke owner should do, and have no issues.
what about electrically controlled carb?
Great video! I'm playing around with a supercharged two stroke idea involving a secondary piston or drum valve to control exhaust timing.
FYI - check out the McCulloch BP-399-T engine from the 70's, that was going to be for snowmobiles .. production was canceled, only a few were made .. it had a small piston opposing the main combustion piston/cylinder ... that small piston was used to pump / supercharge the fuel/air mixture and to also balance the motor. IMO, its almost as complicated and costly as a 4 cylinder 2 stroke, so why not just do that? 2 strokes are simple, adding parts and complexity is almost always a step backward.
2STROKE STUFFING u just need a special porting
Use very low port timings. Something like 110 deg transfer, 140 exhaust.
it isnt that insane to think about since most of the detroid 2stroke diesel engines depend on superchargers to work
There where more companies who where experimenting with this design. I have a moped which also uses this double piston design. The air pump piston has a very large diameter with a very small stroke. The piston is also ludicrously heavy to balance the system. Check out the Motobecane 99z engine. You can find photo's on internet of this engine. This engine was mass produced somewhere between 1976 en 1982 I think (I don't know the exact dates).
Thank you for putting that too bed for all of the naysayers. In the western US we have been running turbos on our 2 stroke snowmobiles for years and the performance gains are incredible, especially when you are talking about elevations from 6-14 thousand feet. They do work and they do work very very well. I have a skidoo summit 850 that is 165hp stock and at just 8psi boost it is about 225-240hp depending on elevation and fuel used and absolutely incredible. The funnest thing you can experience in my opinion.
Can you upload vídeos of your turbo setup ? I would like to see , seems hard to find videos of turbo snowmobiles
@@rodriguezfranco3839 czcams.com/video/GJQj38ifZao/video.html
Think it would work on my 1999 KTM EXC300? I’m 19 building a supermoto build with the ktm and my dad has a turbo laying around from when he did it to normal bikes. But do you think I could actually well put it together and turbo the ktm 300?
everyone's using the Detroit diesel 2 strokes as an argument for turboing 2 strokes, but those engines and gasoline 2 strokes are completely different. on the Detroit, the fuel doesn't go through the crank case, it goes straight into the cylinder through ports in the sleeve. you must supercharge them, or else the exhaust wouldn't be forced out and the new air/fuel wouldn't be forced in.
Finally, I don't have to state the obvious - cheers dude - matt
The Workshop lol finally did something right in my life
metallicakid83 correct and they are oil lubricated like a four stroke.dont always need a blower they made one way clutched turbos that would spool at idle until the exhaust would build up past idle and spool the turbos
Joe Cameron how would it spool enough to accomplish the scavenging and intake at idle? never heard of them ding that before
metallicakid83 they only need a few psi of boost to idle till the turbos take off on exhaust.look up emd motors im pretty sure some detroits were only turbo charged to with no blower
To sum this up, the greater the difference between input pressure and ambient exhaust tip pressure becomes, the lower the efficiency of a 2 stroke will be. At no time is a 2 stroke sealed, to maintain any kind of reasonable efficiency it completely relies on equalibrium.
Definitely the best explanation I've seen online completely correct with common sense included!
I love 2 strokes, and I love turbos, this video combines them, awesome. Thanks for making this vid, keep up the good work.
I can understand where you're coming from for 2 stroke engines I'm general, but for snowmobiles you'd be suprised how big of a market after market turbos are. On most modern 2 stroke snowmobile engines, 1 psi from a turbo is 7-8 hp and most engines will handle up to 11 psi on pump gas. So for most engines you will go from 150-160hp on a 800cc twin to 220-240 hp. You may think that's not worth it but it most cases where people use turbos it absolutely is worth it lol.
One of the big reasons to turbo a sled is altitude. Air gets thin at high altitude, so even with perfect jetting, the 150 hp your engine makes at sea level is knocked back considerably. With a turbo you can gather more of that thin air and keep your power.
Back in the 80's we used to "turbo the crank" of our 2 stroke motors. This consisted of machining deep groves on the outer edge of the crank flywheel to pick up more fuel mixture from the case like a fan blowing straight into the intake port. To this day I have no idea if it actually had any benefit, we thought it was pretty trick.
You tell us? Did it make a difference?
@@danielg6967 We didn't have access to a dyno back then, so any "difference" was measured only subjectively. Was it a significant night & day difference, no. That said, having a psychological advantage of my magic secret weapon did improve my competitive confidence.
cleared a few things up that i have been thinkink about for quite a while, great vid dude thanks
This is one of the best explanations I’ve seen on this topic!
the part you are overlooking in this video is the expeller of the turbo acts as a constantly fluctuating valve. it's rotatiomal movement, or lack there of creates the pressure in the exhaust pipe to cause the reverb of pressure back into the cylinder as the exhaust gas pushes on it's vanes... and the open, 2-stroke system is actually the better option for spooling a turbocharger, you can put a bigger turbo on a 2 stroke than a 4 stroke because it moves twice the air at a given rpm...
Hey look, a guy who actually knows what he's talking about. You should have done the video, instead of this knob.
William Ward yeah, we run gt30 turbo on 800cc 2 strokes, and it spools faster then a gt28
thank god I wasn't the only person sitting here screaming at my screen because he OBVIOUSLY doesn't understand turbocharging...thank you
It moves twice as much air assuming a VE of 1.0 at any given RPM. Never disregard friction, my friend.
William Ward. I fully agree with what the other comnenters are saying. You need to produce your own video.
thank you for answering the question in the first second of the video. High quality shit mate
exellent video i allways wonder how a two stroke engine work and you explained it perfect thank loads ste
Best explanation I’ve ever seen on this!
Damn good explanation. at 9:18 i wanted to know about the turbine's backpressure on the cylinder having any effects but you cleared that up later.
Glad that I answered your questions - thanks for the comment - matt
You're quickly becoming my favorite mechanical style channel. The simple fact that you give the TL;DR at the beginning for 5 seconds. Watch the rest if you want. You're informative, easy to understand, and funny at spots too. I love it. Cheers brother
I don't know why but I always watch the whole video when it answers my question in the first 5 seconds... Quality Video, great explanations 👍
Great video, i am quite intrigued. It gets my engineering cap on.
Snowmobiles have been doing it for years
turbo cr500 supermoto come on. someone do it
Supercharge it
What wrong with you!!
The CR500 is crazy enough as it is...
I was just looking at some of the comments you get. OMG. You have the patients of a saint. Thanks for showing my bike. The 750turbo. I am a member of Lorcan's site.
Insane information! Great video!
Great explanation, I have been a 2 stroke mechanic since the late 60's, my father was a McCulloch dealer, raced go cart's and even set a track record in the single engine class at 127.5 MPH, the engine was only 5 cu.in. or 80cc.
Turbo charging isn't worth the trouble, you are better of "stuffing" the crankcase (filling all empty space in the crankcase that you can, Now McCulloch had a prototype snowmobile engine BP-399 and a chainsaw BP-1 that used a balance piston to not only balance the engine but to draw more fuel/air mix in and compress it just that much more these engines put out insanely high power and RPM for their size. my BP-1 would turn 15K rpm and practically vibration-less. here is a video I found on the BP-399 that scares the daylights out of me because where on earth are they going to find a clutch that will stay together at 16,600 RPM? enjoy czcams.com/video/c7eTGDn8mmk/video.html
Back in the late 80s I had a tuned Honda VT250 (4 stroke) and that reved to over 12,000. There was a racing series in Japan, so you could get parts if you had money, it did blow up a lot though. I think I red lined at 13500 but that is from memory and with a lot of tuning parts and work.
Try F1 clutch. They proven to be working at 20k so I didn't see the problem of running it at 16k
Yet another person that doesn't get how a two stroke turbo works. I.ve seen over thirty five lbs of crankcase pressure with a turbo, never seen ten by stuffing.
Did you build your shed over an old graveyard , random breezes , ghosts knocking stuff over and a raven perched above your chamber door
the graveyard he build it on is called great britten
The skidoo lads seem to have cracked the formula as they're turbocharging their sleds these days.
Super video , i have been looking for a good explanation on this topic
No worries mate, thanks for the comment - matt
So I can turbo my Husqvarna?
Always been curious about this due to crank case pressure.
Not run off crank new skidoo 2020twin turbo fuel injection triple
its to bad that the two stroke engine is slowly dying out. love the sound of them. you learn us so much. wished there where more channels like yours. cheers
Main problem is they kinda stop developing them .
Imagine if they put the same amouth of money in 2 stroke that company put in 4 stroke ....
Direct injection could help a lot 2 stroke performance .
You don’t understand i “need” to Turbo my 2 stroke 1/5 rc!
That's would be awesome! can you imagine those alx eninges turbocharged? The alx 80 look crazy already would love to see that!
Look new turbo skidoo 2020 will blow everyone mind
Chears matt. Great channel
l understand how you feel. I worked for a company full of delboys with a delboy line manager.
After paying to go to Australia for some experience (couldn't find any one willing in Scotland) and paying to go to college for two years to achieve two asme 9 qualifications and finish top of my class. I found myself in Fife welding copper boilers for a company(fantastic work)
Unfortunately I only lasted 2 years before having a mini breakdown.
This was due to the relentless bullshit, lies and fukin morons that I worked beside.
To give you an idea, the company had a cad system, used the cad system on a daily basis, but my "technical" drawings came from Microsoft word with no measurements and not to scale.
I've been working delivering pizzas on minimum wage since I left, and that was 3 years ago. I love fabricating and welding, but can't shake the massive dent in my confidence in the industry ( I worked a couple other places for a couple of weeks and they were the same sort of thing)
If you have any advice I'll take it. (or a job)
If not, I hope this helps explain why people like dell are a bad influence and shows the effects they can have on people as well as there chosen profession.
FAKIN CANTS
Good explanation, very well done.
Cheers dude - welcome to the channel - matt
Just curious. Not for a turbo but for a supercharger. Constant flow of it yeah, but crankcase seals on downstroke. Diverter valve from intake port to exhaust pipe. Would it help keep fuel mixture in cylinder if timed right?
Thing is a 2-Stroke is relatively simple, powerful and
light, so adding a turbo to it seems like you don’t get a lot of pay-back? Now it is more complicated, more powerful and
heavier. And as said they were being fased out because of emissions.
To be honest the last time I rode a Turbo was the 90s, and
it wasn’t fun on a motorcycle.
@@arnehurnik depends on the setup titanium mani weighs less than full ss. bigger snails definitely weighs more than smaller one
did you cover the pressure rise in the exhaust from the turbo. if your turbo provides boost it will provide back pressure. say a 1.5:1 ratio. if you have 10psi of boost youll have about 15psi of back pressure on the hot side of the turbo. youll get exhaust reversion with a turbo you wont piss away the intake pressure when the intake and exhaust ports are open together, you have the chance to fill you intake with exhaust instead.
this is a good example oh a supercharged instance not a turbo.
I guess it depends
On intake the piston scavenging may be enough to offset the backpressure of the exhaust
On exhaust the chamber has just fired and it will be at even higher psi than the backpressure because it is so hot, blowing the backpressure and exhaust out through the turbine together
How does your exhaust spool the turbo efficiently when you’re exhaust gases are flowing forwards and backwards a little.
Priceless easily understood explanations
I'm 3 min in to this and I am very interested.. lol, thank you. I've subscribed. never learned motor works but like to pretend I can understand what all these # are.
Thanks for the comment dude and welcome to the channel - matt
aweSome video! super nice and easy explained. did I understood correctly that you said pisses out? :-)
Yes sir I did lol
😂👍
Best explanation 👌💚
@The Workshop It is supercharged. It has a volumetric effeciency of greater then 1. meaning it is able to process more then it's static displacement per revolution.
and snowmobiles use 2 cylinder 2 stroke engines now a days, the picture you showed was a skidoo 3cyl 1200 cc 4 stroke turbo.
Yeah my bad, editing is so hard lol (smallest violin)
what about the forced induction forcing open the reeds on the downstroke when the inlet port is uncovered ?
A similar thing happens with normal 2 strokes, although this is compounded when using a turbo system. This is called reed valve flutter and I'll go into more detail in the next video on this subject - good comment - matt
cant wait to watch it, its been on my mind for years
rotary valve 2 stroke bruh
Jacob Westphal that's the 1st thing that came to my mine was the old rotary valve 2 strokes
Best way to make power on a 2 cycle
the way I see it, four-stroke engines have completely isolated intake and exhaust cycles, so you are free to add pressure to the intake (to an extent). In two-stroke engines, intake and exhaust cycles overlap, so if you add pressure to the intake, a lot of fresh air/gasoline mixture will rush out of the exhaust port (something that already happens to some extent in regular two-stroke engines)
This is why power valves became the choice for manufacturers to increase horsepower reliably. The part about increased heat and pressure forces the manufacturer to use better quality parts which increases cost.
the Detroit must have the supercharger to run. some have turbochargers added on top of the blower .the torque curve is pretty flat no lugging power
Detroit Diesel engines don't run the intake air through the crank case to pressurize it. And they also exhaust valves in the head.
Could you tell me why Detroit can't use VGTs?
Some can spool their turbos with a gear train on the turbo shaft for starting
no 2stroke detroid diesels depend on a supercharger to work and use ports not valaves
I think you mean the Detroit Deltic (greatest engine ever) which had opposing cylinders and ports at the bottom of each stroke, detroit engines with one crank and a head would use valves 2 or 4 for exhaust and ports for intake
I owned a 2 stroke, the exhaust kept clogging up, I can't imagine adding turbo without adding exhaust valves
What engine is it?
The Workshop uhm, it was just a 50cc. And it was the reason because the next street bike was a 4 stroke 250 instead of an aprila 2 stroke
Great video! =)
Does any of this change in regards to direct charge vs cross flow? And of course, with a bigger engine, like say a 100ci 6 cylinder.
you sir, are awesome
Thank you! lol - matt
Great video, you didn't really explain the reflected pressure wave from the back of the expansion too well for anyone who doesn't understand it, but other than that good vid. I've lay in bed at night and wondered how it would go on a dirt bike but other that, too much fucking around to make it work well, like you say, and the best thing about a two stroker is simplicity and reliability....and they scream their tits off anyway! Leave it alone, mix up some fuel, tip it in the tank and try not to kill yourselves, how fast do you really want to go anyway! Peace bro ✌️
Thanks for the comment dude - matt
An excellent explanation of the basic pros and cons of 2-stroke turbocharging.
A lot of the problems can be solved by having an exhaust valve instead of an exhaust port -- but that's more complexity, and the whole point of 2-stroke engines is to make as much power as possible with the least complexity possible.
Very true
It seems from your explanation that the biggest issue is the exhaust geometry? I think it’s a good rule of thumb to thoroughly research the tolerances of any engine before modifying it.
I appreciate you taking time to explain to the average person what to expect when turbocharging a two stroke!
The biggest issue is that 2 strokes are very sensitive to intake pressure and velocity, adding a turbo just makes thing worse
@@dirtygarageguy Got it, I totally overlooked the intake side of things.
I'm seeing alot of 'Detroit Diesels are supercharged'. No, they are not. The blower is used as a scavenge pump to pull exhaust/ push air through the engine
Quite true, that was coming up in the next video to this subject, but you've beat me to it lol Technically is known as artificial aspiration. - great comment - matt
Correctly put. Roots ts3 engine is a very good example.
the first thing you said: can you turbo 2-strokes, yes. can it be down well, no. on that fact is a turboed snowmobile putting out around 160hp stock naturally aspirated. turboed they put out over 300hp. doubling your horsepower isn't good enough to be considered well? it's only the thousandth time I've heard some youtuber spurge bullshit on a topic which they didn't research well enough
The Workshop look up skidoo 800 etec aerocharger. running around 14lbs of boost with a the intercooler and 110 that's what they achieve
The Workshop no need to even build it from there. because power is such a high priority for snowmobiles running at the high elevation the precision fit of the parts are much more spot on than a normal car. that's why 800cc produces 160hp
I second Ross.
I agree, there are many manufacturers making turbo kits for sleds that work great and have amazing power increases...
Nothing uncommon about that at all.
A 700cc Polaris with a hair drier on it will put out 300 HP.
Check out the mountain sleds.
Interesting material, thank you!
What if one based a turbocharged gasonline 2 stroke design on diesel 2 strokes, coupled with direct injection? I'm wondering (strictly on a theoretical basis) if it may be a good tradeoff of simplicity for more power and maybe improvement of some other properties?
I may have missed something here, but if you have a turbo fed by the exhaust, wouldn't you have a higher pressure built up in the exhaust as a result, negating the higher pressure differential you spoke of, and essentially turning the system into something resembling your bigger planet scenario?
Can you nitrous a 2 stroke safely ? what fuel and a/f ratio? what premix ratio?
Great question, it deserves its own video - added to the list
Yes you can i have done it before.
But they get hot so godamn quick.
A/F is hard to understand on a 2 stroke. But if running on NOS you should add a little more oil to your gas.
Would it work on a PWC? My standard ratio of oil to fuel is 30:1 .... what would be the right amount now?...... would I want to have 10.7 - 11.7 afrs under load on pump fuel?.... I am thinking maybe even pump E85 which 9.7 (stoich) and 7.7 AFR under load with NOS.... any thoughts? Engine Longevity? Its just more brainstorming right now.... also now that you said the engine heats up it is concerning but detonation/knock would be more concern..... the engine is cooled from water flowing through exhaust and engine cylinders so I think water temp and ambient temp would play a factor there. E85 is supposedly better at preventing knock/detonation.... I just have to plan to best way like bigger fuel pump(s) bigger injectors ... fuel pressure regulator, NOS and special NOS controller w/AFR gauge.... and of course finding the right oil to fuel mixture..... 30:1 won't cut it lol
2 stroke engines are very temperature sensitive adding NOS always increases the combustion temperature due to the free oxygen. As for engine longevity - its only going down. Alot of the heat is transfered into the piston rings, even more so with NOS included, this is usually what gives up the ghost first. I have seen a couple of drag racers use thicker rings when running NOS to reduce things going tits up.
As for premix etc I wouldn't know to be honest, although it don't think it would be too much of a problem. By the time the oil makes it into the cylinder its done most of its job with the bearings etc. Changing the premix ratio will have an effect on how stable the combustion is, and I don't know what chemical reactions take place with NOS and the oil itself.
As for coolant and knock, the knock occurs during compression, the coolant has little effect with a system that is fixed. Coolant removes waste heat after the fact, and obviously from the power stroke previous. In other words you have to test the heat saturation of the cylinder/head before making any judgements out changing the coolant system. If the cylinder/head is too cool then this could cause condensation, which when running NOS would lean out the mixture.
This would cause combustions temperatures to climb and then knock would occur. So you then cool it some more making it worse.
- matt
What is the base fuel pressure for this 3 cylinder EFI 2-stroke.... is it the same as 4 stroke 43.5psi? Do you think a standard eBay type of fuel pressure regulator would suffice for measuring that set base pressure someone on the forums locally is having issues with hesitation and the like and I suggested 5 tips: 1)upgrade and Hardwire Fuel pump to relay (hardwire cause of voltage drop issues in electric pumps), 2) clean, replace or totally remove fuel pump's filter (fuel pump wasn't designed for oil/fuel premix, factory has a separate tank that injects oil but is removed cause of common recall issues), 3) have injectors sent out to be cleaned 4)Add fuel pressure regulator to keep fueling optimal for such a finicky particular 2 stroke engine design. I say that cause with carbs they were always picky on my goped and now with EFI premix is picky so setting base pressure or even increasing pressure could eliminate hesitation issues etc and allow to dial in/tune better. 5)Add AFR gauge and make sure its at least 10.7-11.7 AFR rich underload. Any thoughts?
Video ends 0.06
More like 0.05 lol
The Workshop hahaha yeah, interesting tho, always wondered about putting a turbo on my rs125
lol don't lol after all its not worth doing. If you do your bike test you'll want something heavier
The Workshop no I wasn't gonna bother, when I'm 19 I'll do my a2 and get a Aprilia rs250
umm, do I need to increase or decrease the stinger id with the turbo? I'm guessing stock stinger id would work at 5 to 7 psi?
I'm wondering whether the crank case tranfere system can be eliminated by directly feeding the charge in through the in let port by using the pressure from a turbo or super charger.??
great vid mate! i personally have always been amazed with 2stroke engines, my first vehicle was a 75 rd 350, there power production per cc in those days were unmatched, seems to me thou that a geared charging system rather than a turbo would be easier to deal with the expansion chamber issues. but after seeing what Suterczcams.com/video/0leUj-p43uU/video.html has recently done with the MMX500 engine ( with combustion chamber the size of the bottle i'm drinking out of ) putting out 200hp (and more now from what i have read) in a bike that weighs 280lbs, whats the point? i mean really, how much craziness can somebody handle? LOL
czcams.com/video/O5NUEwwwtgs/video.html
lol I know what you mean, welcome to the channel mate - matt
the main thing your missing about small motorcycle two strokes is there is no forced lube system on these engines so you need to add a system
This video is addressing the idea of a 2 stroke, there are other problems too, like reed valve stresses (fluttering etc) and others. With regards to the oil feed system, you can always just add an oil pump from a regular 4 stroke and have it belt, gear or chain driven off the crank - good comment though - matt
(p.s - there will be a follow up to this and your point will be included, I can see there being load of questions from this video)
The Workshop if the premix can lube the crank, wouldn't the oily exhaust vapor be enough to lube the turbo? That's how expansion chambers work, in that they reuse the unburned vapor. thoughts?
lol no. The turbo requires oiling at the bearings within the turbo body where the shaft is. All you would do is oil the blades of the turbine, which would do nothing, apart from slow down the turbine slightly due to the weight. Expansion chambers use the high pressure combustion wave.
Yeah that makes sense. Wouldn't be very hard like you said.
Since iam a faithful companion of your channel...... I have a request I'd like to know the ideal timing for minimal transmission wear when quickshifting my bike
I can adjust delay and ignition cut timing
Since you proven your skills I would really appreciate your opinion and explanation
thank you for the concise video
I would make a kind of mech valve just after the exhaust port, and raise the inlet ports as hi as the exhoust maybe even further, then drive the turbo with a big brushes motor 3turn at 160 Amp
1 bar is actually 14.7 psi
1 bar is 14.5 psi, 1 atmosphere is 14.7 psi
Jordan Richards you played yourself
Zenkor, why would they have the 2 different terms for such an insignificant pressure difference?
Jordan Richards no.
But Earths atmosphere is 14.7 PSI though lol
What a bloody terrible explanation.
what a bloody terrible comment - reasons, arguments, examples - if not fuck off
Excellent Video, there's a specific name for Turbo'd 2 strokes and i can't remember what it is- any ideas?
exellent job. i did turbo my am6 2 years ago and it works fine as long as you know how to make it work. nice video.
Do you have any pictures, would love to see then. IF you had any I'd put them up in the next video - cheers dude - matt
i will take some when i rebuild the project. my bike got stolen last year..
that's a shame, yeah pictures would be great - matt
When you did your math on the ex pressure wave you did not account for drive psi? Witch would be 5-7 psi higher than you boost pressure. How does that play in to the reversion wave?
Now can you tell me how one works on a piston port 2 stroke 69cc motor how would u go about lubricating the turbo
I have a question, in my 2 stroke the reeds are on the side of the cilinder and not on the crankcase so that difference in pressure that you talked about from the crankcase to the cilinder is not important anymore and so an engine like mine would make similar power to the type of engine you described, having similar displacement and all the rest?
What engine is it if you don't mind me asking?
So I'm planning on doing this on a 500cc virtical twin 2 stroke from a snowmobile making about 125hp , if I reduce my stinger Id, increase fuel, and put about 8 psi into the intake, is it realistic to go from 125hp to 180?
Thank u u saved me a lot of time I just run a 2/5jet wet kit nos
Great vid. Thanks !
No worries, thanks for the comment dude - matt
I imagine there could be some sort of effect on the turbine wheel absorbing the head end of the exhaust pulse, and sizing your turbine is probably pretty important to make sure to conserve as much of that pulse as possible without building excess backpressure, but this is interesting! And it certainly works in a very different way to 4-strokes.
I like a healthy balance of delboy videos.
Wouldn’t the turbo add back pressure and allow somewhat normal running though?
great video! thanks!
Cheers dude, welcome to the channel - matt
People have been turbo charging two stroke snowmobiles for over 20 years.
Please correct me if I'm wrong but if you have a turbo before the expansion chamber wouldn't that be counter productive to boost, If the gases from the expansion chamber is putting back pressure on the turbine ?
"turbo before the expansion chamber wouldn't that be counter productive to boost"
Why? Or should I say in what way? The exhaust gases exiting the cylinder are at there hottest and this means more energy. However, it also messes with any backpressure you would recieve from you exhauts system so would wouldn't run an expansion exhaust. It would also mean some tuning on a dyno to know where exactly yo stick the turbo to balance out the pressure waves
Brilliant video thank u ❤️👀👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍
There is a 2 stroke v10 japanese diesel tank engine that is twin charged and they had a lot of problems while developing that engine. Its called mitsubushi 10 zf mod 21 which was in their early to mid cold war tank which i currently dont remember its name
Hello !!!
Great lecture sir !😀😀😀
I'm building a double turbine for my motorized bicycle engine ( 4 stroke 66 cc ) , that I will install at the end of the exhausting sistem .
Do you have any advices ???
Thanks in advance !!!
All the best ,
Sorin / ROUMANIA
That crank induction is so cool!
You would have more power in higher ambient pressure for the same reason you lose power on pikes peak. The number of moles of 02 that you can fit into the combustion chamber directly dictates power production. Displacement, forced induction and nitrous oxide, are all about burning more fuel. Also, rolling resistance is liner, so higher gravity is net positive (Eg: trains/trucks work).
Another thing is that a turbocharged goes on the exhaust first then exhaust fumes spin the turbine and then the air made with that goes in to intake, thous getting higher pressure in engine, which Would require to tune to run more fuel as well to even out the a/f ratio
I thought about pressurizing the air box on a two stroke using a muffin fan. Or even my 1200 bandit. We need to have flexible rubber windows so it can exhaust the extra air pressure outward or open inward to let more air in till it’s a balance between the pressure. Thinking about this more a twin throttle cable to operate the reastat to adjust the rpm of a muffin fan on the air box relative to the throttle position vs rpm. Porting the intake and exhaust on the cylinder would help too. How about doing a video explaining this I think the two stroke bike would be ballastic to ride.
I appreciate your view of PCC two strokes not being inherrently "supercharged". Never thought of the terminology like that.
Are the Reed valves tuned to some rpm as well ?
Metric: 1 Bar @ sea level
Imperial: 14,5 PSI @sea level
The Imperial system is so Intuitive...
Now that KTM is coming with EFI 2 strokes for 2018 won't it be easier with all electronics + a electronic port exhaust maby not 100% but 90% instead of 60% efficient? WITH A Variable TURBO?
Btw, your videos are awesome.
Thanks for the vids,really open up my view on 2T engine..
Question,can u feed Nitro(NOS) to a 2stroke engine??what could ne the result,if Nos were injected after the carb or directly into tbe crankcase or any intake port??
"Question,can u feed Nitro(NOS) to a 2stroke engine?"
- yes, however 2 stroke engines are temperature sensitive - i.e they quite easily detonate.