Explaining, Designing And Building A Single Cylinder Four-Stroke Exhaust Pipe : SSR Part 10
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- čas přidán 30. 07. 2024
- I'll explain how four-stroke exhaust tuning works and build my own single cylinder four-stroke exhaust system in this video. The entire process from designing the pipe to fabrication is shown. Learn about wave tuning and inertia tuning and how to determine exhaust pipe diameter and length with formulas. A simple method for creating a tapered header. Lots of info for anyone considering building their own DIY four-stroke exhaust system, especially for single cylinder engines like scooters, mopeds, pit bikes, dirt bikes and more.
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Four-Stroke Performance Tuning : amzn.to/3v3oNHl
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Performance Automotive Engine Math : amzn.to/3ejWK0b
Performance Exhaust Systems : amzn.to/30gKwNP
Slip-On Muffler : amzn.to/2PAzFfj
16ga U-Bends : amzn.to/3c5XEuw
1/4" Steel Plate : amzn.to/3bohqSV
Other Pipe/Tube & Supplies From : www.mcmaster.com
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• SSR Lazer 5 Moped Project
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#ExhaustTuning #ExhaustBuild #TunedPipe
0:00 Intro
1:16 Four-Stroke Exhaust Tuning Explained
3:45 Formulas For Primary Pipe Length & Diameter
6:24 Measuring Curved Pipes
8:31 Tapered Header Info
10:11 RPM Range
11:27 Doing The Math
15:41 Port Length
18:04 Building Begins
22:28 Tapered Headpipe
29:47 Flange Mount
38:47 Muffler Location
46:57 Pipe Support Bracket
51:16 Muffler Support Bracket
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Songs provided from the CZcams Audio Library. (In order of appearance.)
- Sun Spots by Silent Partner (Intro)
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Sources & Links :
"Performance Exhaust System Design And Theory." Trevor Anderson, "Engine Labs". www.enginelabs.com/engine-tec.... Accessed Feb. 25, 2021.
"Muffler and Header Pipes Information - Thumpstar." Thumpstar, • Muffler and Header Pip... . Accessed Feb. 23, 2021.
"Piranha 160-R Dyno Vs.Piranha Daytona 150cc Anima 4 valve." Wholesale Cycle Piranha Pit Bikes, • Piranha P160-R Dyno Vs... . Accessed Feb. 23, 2021.
"High Performance Exhaust Pipes For Pit Bikes." TBoltUSA, tboltusa.com/store/tech.php?p.... Accessed Feb. 23, 2021.
"Calculate Exhaust Header Length." Stephen P. Mullen, Oldsmar, FL, www.nightrider.com/biketech/ca.... Accessed Feb. 23, 2021.
"Tuned Exhaust Pipe Length Calculation For Single/Twin/Fours." "Mez Porting". www.mezporting.com/exhaust_len.... Accessed Feb. 23, 2021.
"Four 4 Stroke Exhaust Pipe Calculator", Version 14. "Ariyant Creative". (2021) play.google.com/store/apps/de.... Accessed Feb. 23, 2021.
"Tapered FXR header. Ideas?" "KiwiBiker". www.kiwibiker.co.nz/forums/sh.... Accessed Aug. 18, 2020.
"Harley Exhaust System Design." "RB Racing". rbracing-rsr.com/exhausttech.htm. Accessed Feb. 23, 2021.
-Bell, A. Graham. (2012). "Four-Stroke Performance Tuning." Haynes.
-Baechtel, John. (2011). "Performance Automotive Engine Math." Cartech Inc.
-Baechtel, John. (2012). "Competition Engine Building." Cartech Inc.
-Mavrigian, Mike. (2014). "Performance Exhaust Systems." Cartech Inc.
-"Two-Stroke Pipe Building Information." 190mech, "49ccScoot.Com". 49ccscoot.proboards.com/threa.... Accessed Mar. 14, 2021. - Auta a dopravní prostředky
The detail and tons of work put in these videos are outstanding!
I agree absolutely!
I'd like to point out a couple of things regarding exhaust sizing and steps. Steps can be used for two things, acoustic tuning and reducing velocity.
You want to keep exhaust from going too fast or you induce backpressure through wall friction, and you want to keep it fast for inertia tuning, but the neat thing is that right at the port the gas hasn't expanded much and velocity is lower. You can typically use a *much* smaller tube off the head than common wisdom would suggest, if your transitions and bends are nice (long radius bends, like 4x tube diameter CLR). I have no trouble speccing a 50hp cylinder through a 1.5" OD tube for the first few inches, and that's not even pushing the limits. So if your port is "too small" it probably actually isn't if you're prepared to put the labour into your pipes. You'll still get that section of high velocity inertia driven vacuum at the end of the blowdown phase of the exhaust without the backpressure inducing super high velocity at the end of the pipe.
The second is that a large enough step acts like the end of a pipe. If you go from a 1.25 to a 2.5 immediately at your tuned length (using a cone that slips over your pipe would be the easiest and most attractive way) you can then taper that back down to your normal exhaust size (or slightly larger, say 1.5") and run the exhaust whatever length you need to. The major tuning point will be that first large step still
This is awesome. The world needs more single cylinder header design materiel.
Glad you mentioned correcting that graph. I was confused at the torque and horsepower converging at what appears to be 10504 RPM. It's supposed to be Torque*RPM/5252=HP
Hooray, fresh material!
Hey I’m all caught up on your SSR project. Thanks for sharing.really enjoyed it so far!hope there’s more to come. Learning a lot!
Thank you so much Brent. As always, such a pleasure watching you work.
Sincerely,
Alicia.
Nice job! Finally someone who dives into the math of 4t exhaust tuning.
I am amazed at your skill, patients and ability to actually make parts out of plain hunks of metal... You da man Brent. Another great video... I look forward to the car show footage coming up...
Thanks! Car show vid will be a bit. Gotta get caught up on the build stuff that I didn't have time to edit before the show. Then I can edit the stuff from the show. I'll just say it was a whole lot of fun. 😁
Really enjoyable video.
There are so many custom touches on this bike. It's really going to stand out when finished.
Thanks Bud. It may stand out in all the wrong ways, but it definitely won't be exactly like anything else. lol
You, good sir, have given me a lot of very valuable information. I'll be referring to this video a lot when I fabricate my exhaust!
The equations you used and calculators you found are solid gold to a guy like me. I can cut and weld but maths kick my ass.
You're a gentleman and a scholar.
I'm glad to hear that it helps! Good luck with your exhaust project!
This channel is sooo addicting! 🔥
This is my favorite channel , the amount of information in every video is just insane 😍😳👏
Thank you so much for sharing this knowledge I know all the hard work that goes into every video
Keep up the good work!
Thanks so much!
Excellent job start to finish !!
Under rated CZcamsr! great vids
Looks like a fun project. Came out excellent...
Thanks for all your info, You done a fantastic job, nice one
Love these technical explaintions
I like the way you do for your bike. Keep posting more for your bike stay safe and ride safe.
Thanks!
Nice exhaust. Good build.
So happy when i see you upload.. Been waiting.. Cant wait to see this build done and tested.. Then back to the 2t stuff again hopefully.. Either way keep it up man.. One of my favorite channels for sure..
Thank you. I'd like to be riding the 2T right now, but the piston is out of stock at the manufacturer.
@@49ccscoot ya man just love ur vids. imma upload my 70cc polini adly soon. just waiting for weather to be better.. much inspiration from ya man.
Very informational, thanks you !
Amazing video
This video makes me want to perfect my Huasheng 144f 53cc ungoverned to 9300 RPM to perfection.
Hell yeah.....welcome back, it's been a minute friend.
Great video
wow thats beautiful exhaust
Thanks!
Interesting stuff
Konkretnie 😁😁 gratuluję
Please, continue!
great video, we made a lot of testing with YX160 based engines with 184cc and TB Raceheads V2 (using takegawa S35) Cams. We used also LM-Exhaust Systems for Pitbikes. the ID of the Pipe is arround 31mm and the silencer had 38mm, we made a piece to reduce the silencer (similiar to a DB-insert) to 31mm. We also have a dynojet here, and found with the 31mm piece 1hp more power. So keep in mind to check your insert in your silencer, we also tested the same type as yours, and had arround 3hp loss of power. Thanks for the great details
How much do they typically put down stock and then after the big bore, head and cam?
@@49ccscoot Results here (all rwp on dynojet)
160cc Stock with Nibbi PE26 (well recommended) 14-14,5 HP
160cc Stock with Nibbi PE28 (well recommended) 14,9-15,6 HP
184cc with Stock Head (compression adjusted) 15,7-16,8 HP but NM torque increase over 2nm
160cc with TB race head and S25 (ports stock not ported) 18-19hp
184cc with TB race head and s35 cam (ports stock not ported) 19-20,5 significant increase on torque nm
184cc with TB race Head and S35 cam (good porting + copper guides and seats) up to 22,8hp (thats currently the highes rating we had)
For now i build one with a bigger inlet valve (custom made) hope to reach over 23rwp.
All fuel tuned with a Bosch Lambda Sensor and a thread insert in the pipe.
About lifetime, we have some engines running over 30-40hours and still going strong. Nothing crashed jet
@@marvin22racing99 Awesome! Thanks for all of the info! I may have to check out the 184cc setup someday if I end up liking my moped.
2 strokes are the passion !
you are the best!
I really thought you were going to skeletonize that muffler bracket like the cargo rack. Still it's refreshing to see someone breaking out of the TIG fabrication everyone seems to be doing. Awesome build series.
Well, I didn't own a TIG at the time. I wish I did have one (and know how to use it) for some of the welds TBH. I didn't cut the bracket up because I didn't think it should lose any rigidity. Plus, you'd be looking at the swingarm and it's defects through the holes in the bracket anyway.
Awesome!
Nice 🎉
love the shout out to kiwibiker
Would have been nice to hear the exhaust after seeing you make it in for 35 minutes! Very awesome and informative video are you going to make one as well for a 2 stroke?
Imagine how I felt after the amount of hours that it took me to build this thing. lol I don't have any wiring setup for it, carb/intake not installed, kick start not clearing...
No plans in the immediate future to build a 2T exhaust. Maybe someday.
@49ccScoot How about now? Very curious if it worked how you wanted, etc
It definitely needs wide 16" bobber style tyres.
Btw, did you see new SSR laser5? In my country it is called Delta Millennium (2 versions Sport or Joker).
And another one Joyride Moped 50cc or 110cc.. I don't know American market names.
Nice rear brake shaft. Much better than original! Nice job.
I'm going to stick with stock size tires. The reason is that increased surface area and tire weight will only slow it down more. Probably not a lot of difference, but even something like a tire pressure change can be noticeable on low power vehicles.
I looked up the Millenium. Some improvements on styling. The one that I saw had front drum though.
@@49ccscoot it depends on price. Usually Delta Millennium has front disk and drum back breaks. But it still look overload with plastic details and parts. And it is twice expensive previous Delta (SSR Laser5 for you) $560 vs $980
Joyride has front disk breaks only. And it is hard tail fat tyre "chopper".
In my place, sometimes, people set fat tyres on such Laser5 moped for better off-road (sand, forest, gravel roads) something about 3.0-16" and spoke old motorcycle wheels. With 110cc it runs ok.
Nice looking exhaust. May be you can Polish te scratches on the muffler to get them less noticeable. Aren't those closed bends near the end gonna restrict flow?
Not ideal, but I don't think they'll be too restrictive.
انا مشترك جديد ويبدو انني سوف اتعلم الكثير من المعلومات شكرا لك
Yes
I watched all your ssr lazer build videos and have to say you did a great job! Thanks for all the tips and I’ll be using a few of them on my ssr build. Any chance you could sell me those upper ssr side covers? Mine are missing on both sides and I also need the left side engine cover. Looks like the chain broke and then broke the side cover. Thanks again for the videos!
My panels were cracked so I tossed them. Sorry.
@@49ccscoot no worries, I had to ask, thanks for replying back, have a great night!
This couldn't be better timing. I'm looking at building my own muffler for my very modified predator powered mini bike.
If you want to build the actual muffler, I have done that before as well. TBH it isn't worth it unless you really want to try it because you enjoy it or have some very specific need, because there's so much stuff available fairly cheap now.
Here are a couple of chambered mufflers that I have built for scooters. The rectangular muffler was ugly, but my favorite sound from any small 4T scoot.
czcams.com/video/udq3ZwbLTJ8/video.html
czcams.com/video/mctRxIvbzJU/video.html
Hey dude ! I was wondering what happened to the build 🤔 . Thanks to good old CZcams, I haven't been getting notifications for your new Vids 💯🛵 hope all has been well on your end. Salute 👊🤘
This has always been sort of a time filler project. If I have nothing else to work on, I go back to it. Lately, I've had more than I want to work on.
I would have liked to see the finished product work for gratification of all the hard work . Great job though.
Me too. lol This is basically a project for when I have nothing else pressing to do and I've been able to keep myself plenty busy, so it's not on a fast track to completion ATM.
Your videos are very informative and I have learned some things I did not know before, but I have to ask, did you give up on this build?
Thanks. I didn't give up on it. It's something that I work on when I don't have a lot of other stuff going on. Lately the two-stroke and TMAX have kept me pretty busy and I started redoing some of the garage last winter when I probably would have worked on this otherwise.
@@49ccscoot Cool. Thanks for the fast reply!
Hi. When will you continue with the SSR project? I really like your channel but the most interesting serie for me are the SSR.
Br. Peter. Sweden.
I'm not sure exactly, but I am hoping to work on it more before too long.
i like how the book 4 stroke tuning is twice as big as 2 stroke one
It does actually cover a wider range of topics, from fuels to blueprinting. It's not all tied up in 4T valvetrain info.
😍😍😍❤️
Do the length of the pipe includes the catalytic converter?
Pls suggest best position of piston rings for honda wave dash 110
Im from philipines your no. Fan 😊
If you mean clocking or positioning the gaps, there's a pic here : www.49ccscoot.com/bbk.html
Invest in a TIG plant! Even a scratch start one would save you hours in grinding!
Check my more recent vids. A few of the guys from the forum sent me one! Now if I could only use it properly.
You need higher gas pressure on your welder otherwise nice videos lots of good info
There's no gas to regulate with flux core.
cant wait to see a new episode of the tpr build.
Currently trying to decide what I'm going to do. The piston is still out of stock at the manufacturer. I can find it overseas, but for 150% of the price.
@@49ccscoot maybe its time to try out something else?
@@mickis7282 I'd like to and plan to, but I would prefer to see what happens with the TPR in tune with the Lectron first.
@@49ccscoot i would like to see how that lectron performs as well. are you going to do a comparison from 25mm to lectron?
@@mickis7282 I've got lots of test runs with the 25mm, so whatever results I get if the 30mm Lectron is ever in tune could be easily compared. I don't think it's really doing anything for me, but it would be nice to decide based on a better tune.
Bought new gy6 139qmb,best so far at 300$.Non-egr but crankshaft is off top dead center,a 1 cm.Forgot to change stator crushed 2 front bulbs,all inside speedometer,back-light and regulator.For to tighten the new 320mm rear spring,so frame mashed up the main-wire.A CDI from aliexpress gy125D.And it worked great 200m,lost spark.Checked everything,came back without repair.Now it wont start,but old cdi do.9 different program,cheap 20$.Nr1 it has broken,but that is too fragile.Maybe its crankshaft 1 cm off tdc.Same with ALL electric components,has to work 1 minute before it sets in a pattern.But CDI worked compare to the 139qmb cdi for sale.Got 50 bulbs,5 headlight,50 fuses,5 regulator,5 flashers,6 rear light AND 24 volt bulbs.Everything on yellow wire exploded.Last time on the black-white earth.
If the key in the crank has it out of alignment with TDC, the flywheel can be installed without a key. The taper should hold it. That said, I would still prefer to replace it so future service is easy.
If you mean the crank doesn't come up far enough in the bore, then the stroke or connecting rod length may be incorrect or perhaps the cylinder is too tall. 1cm off would make a BIG difference in compression.
@@49ccscoot Different crank on 300$ motor.It is stronger,but never exceed 60km\h.1 cm off on flywheel.Cylinder off angle,old 300$ motor,2 exhaust gasket.Poor workmanship.White signal workED,cdi cuts yellow high rpm.
@@49ccscoot I have a russian car video constant here.He uses 4 top-gaskets on his 4 cylinder Lada engine.Guaranteed to tune the engine,worlds poorest garage.No other reason.
You gotta love the level of translator mess one get used to sometimes xD Small brain cell take hot very much the benchmark. xD
You have a 160 one lung, I have a 600 inline 4... Each one of my cylinders is 150cc. Could I copy that exhaust, but keep it at the 54mm wide? Should I make the tips a little smaller for back pressure? I want to use stainless. Does that change it?
I want to have 4 pipes out of the back.
You may want to do a 4-into-1 or 4-2-1 design instead. If you have a popular 600, you may even be able to find some design info online from people that have already done it. If not, use the info in the description (calculators and reference materials) and tailor it to your ride. It can be a lot of work to build an exhaust, so IMO you should be sure you are working on a plan that is likely to succeed before fabrication begins.
I wouldn't go adding backpressure with a small outlet. Pipe material and thickness could change EGT and that could change how the pipe functions, but most commonly used materials are likely to be close enough.
@@49ccscoot Ok. I have to redo the entire exhaust to get this thing to fit how I want. The exhaust has like H pipes right off the engine, and it is a 4 into one. The exhaust goes under the bike, and I can't have that because of clearance issues. I want to make a cross kart with a bike, and that won't work because I want to keep everything above the frame, and put a skid plate underneath. 600 bandit (probably not the best choice, but it had no title.)
Have you got any further along with this project? 😊
No. I intended to work on it over the winter 2021-2022, but wound up starting working on the garage. I just finished the garage this past winter and early spring. I want to finish it, but I can't tell you exactly when that will be.
does this mean the design and size of canister does not matter? only we need to design the primary exhaust tube?
The muffler may matter. You can certainly have restrictive designs, but also you need a point somewhere that the tuned length ends.
🖤❤️😈
So....how did you learn to do all this stuff?
Just messing around with stuff for years. I tend to learn the hard way.
@@49ccscoot 99.9% of this stuff is totally over my head....and I don't even own a scooter currently, but I can't stop watching. I think that definitely speaks to the quality of content you're putting out!
@@daddister7471 I appreciate the kind words. If you enjoy reading and learning about this kind of stuff, I think A. Graham Bell's Two-Stroke Performance Tuning and Four-Stroke Performance Tuning are great books to cover a lot of topics, depending which engine style you want to learn about. His 4T book is over 600 pages and covers a huge array of topics.
17:42 Am I missing something, or did you misread that and it should be 2.75" and not 1.75"?
I was measuring the intake port for the sake of video. It's really hard to film the exhaust port. So 2.75" was intake length and 1.75" was the exhaust port length.
Hey, wasn’t the mustang white?
Always been grey.
@@49ccscoot I guess I’m just too focused on the truck and bike work. I was gonna leave video and look at another before asking but stayed in the video. I’m at flange making now.
Where is this projekt at?
Haven't done anything to it since the last vid in the series aside from picking up some connectors so I can eventually build a wiring harness. I have every intention of continuing and finishing it because I'm looking forward to riding something with a manual transmission for a change. Just depends when I have time that other projects aren't taking up.
When do you think next video will be?
@@mikkelhagemann5116 I can't give you any answer that I'm sure to stick to. I'd like to work on it over the winter.
No sound bite at the end.. 😢
Hey! Nice Video. is´s a great pipe! but your sharp 2x 90° turns to the esd. makes the pipe from pressure and wave thinking longer. Key word is toubulenz airflow. Wide angels are better. I have seen some guy doing is one flowbench, i i think this is so easy to make. i have to show you! ok it´s not standartirist or some think. but it is a cheap ass way to messure your airflow standart vs moded. all you need i think its in your house.
the video is : /watch?v=cg77Uz31EX8
Thanks. I can't say that I was concerned with the pipe being perfect. My honest goal was not to lose a bunch of power with an awful pipe, and hopefully to end up with something that sounds OK but not really loud.
I have looked into a flowbench after reading David Vizard's books. I was looking at the method using a Helgesen plate. Those plans would allow for calibration and comparison to other people's numbers. The big downside is that the plate has to be precision cut and the plans are more involved. My thought was to try it if I ever ported a 4T head, but I didn't really think the effort was worth it. I wouldn't really need anything to compare to aside from my own before and after anyway, because it's not like people are regularly publishing flow numbers for 139QMB heads and the like.
Hey waltuh, where’s my 4 stroke engine exhaust waltuh
I am the one who knocks... when deflagration turns to detonation.
When it comes to headers and collector/taper it should be noted that as the exhaust gas travels the length of the exhaust it is cooled at the rear most vs the entrance when exiting the cylinder head....the header should be slightly larger diameter and taper down to a smaller diameter.
In auto racing this length is determined by drawing a chaulk line on a collector that is obviously too long and engine ran a bit will burn off the chaulk for a certain length and that length is where you would cut collector at giving you collector length and truely tuned exhaust depending on length may reduce down a couple times to retain port velocity to flow ratio as exhaust condenses as it cools traveling further and further
Basically your taper is backwards large end goes to cylinder head reducing down farther away....exhaust gas doesnt get hotter and expand as it gets farther from the engine, exhaust gas condenses(shrinks) as it cools down traveling away in pipe....how is this being overlooked?
@@jarvislarson6864 The taper is not so much about expansion or contraction of gases. It's for wave tuning, and in that case the only temp reaction we're worried about is how quickly waves travel through gases at different temperatures.
@@49ccscoot i would think 1cyl would be simple but i take it what i know about v8 isnt the same whore in a different dress and the physics are dissimilar? I get what youre saying its like the pulse wave that happens @2k & 4k on tpi intake manifolds and im missing something because jr dragsters have 1cyl & tuned headers but run only wot.is it the off-on-off-on throttle response the readon for tuning exh pulse wave?
17.21 foot pounds of torque at 7500 rpm is 24.6 hp that dyno graph does not make sense. Hp and torque will always cross over at 5252 rpm.
The original graph displayed 1/2 RPM. That's why it's now crossing over at ~10.5k. I never put much thought into it, just being glad that someone posted a dyno, but you're right. I was initially just looking at it as an RPM collection error, but since the dyno calculates HP it does throw it all off. Nice catch.
I bet after making all that stuff you were exhausted. ba-dump.