X-DYNO Tested - Reedy VR-ST .21 Nitro Engine_ Velocity RC Magazine
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- čas přidán 26. 08. 2024
- We fire up X-Dyno to get some hard numbers on the Reedy VR-ST .21 nitro mill. Former factory Yamaha Supercross mechanic Brian Kinney is at the controls hacking out a perfect tune and maximizing output. BK has also designed nitro engines for the RC hobby and really knows his stuff. Check out the full Reedy 121 engine review with dyno charts and graphs in VRC_004.
Final X-Dyno Data
HP: 1.30 @ 24,300rpm (peak corr. hp)
TQ: 55.42 @ 23,900rpm (peak oz. in. tq)
Peak Dyno RPM: 43,000 (peak rpm measured)
Low Avg HP: 36.07/.58 (oz. in. tq/corr. hp)
High Avg HP: 31.53/.86 (oz. in. tq/corr. hp)
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Camera_ Derek Buono
Intro_ Wes While
Editing_ Jeff Eveleigh
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It's truly amazing that this engine doesn't blast apart at the top end. Definitely a beast.
Now that’s very insane rpm
I own an X-Dyno. Brian is a very knowledgeable and stand up guy and really did his homework when he designed the X-dyno. It wasn't a cheap investment to my business here at AB Mods but it was a very good investment!
Adam Blevins,
AB Mods
I borrowed a inertia dyno over a decade back using the "performance trendz" software and data collection hardware, (direct drive with clutch and disconnect coupling, steel flywheel reving to 21,000 rpm) and was going to build myself one for the gas Zenoah engines (I build those for a living), but I bought/put together a water brake type instead.
If all the operating factors are controlled pretty well, the inertia dyno should be pretty accurate. Other than some bearing resistance, and all you have to do is calculate the flywheel "inertia" correctly when you build it.
I am a past motocross guy myself, and I can say with very high confidence, that you will not work on the pro's bikes for a factory, if you are not a sharp guy. If I had to bet money on weather this dyno is accurate or not with in "+ or - 3%", I would put the money down on "it is". If I see comments that the engine should make more power, that could be because other dyno operators claim inflated values (by mistake or on purpose), which would come to nothing more than "wishful thinking for sale".
Now I believe it is possible to get 2 different dyno's to read the same (with a bit of natural engine variation of a very small percentage of power). A mile is a mile. A gram is a gram. And a Horse power is a Horse power (which would actually be a different amount of power, if James Watt had used a different horse for his calculations.). The difference is "calibration".
Nobody has a good way to calibrate a dyno. If, for example, I had a "certified" electric motor that made exactly, say 2hp @ 10,000 rpm from a reliable electric power source, I could get a very accurate calibration.
Then we can all use that calibration set up to calibrate our dyno's, and if all the running factors are controlled for each dyno, they should be very close to each other.
I calibrated my dyno with a gas engine, and the manufactures HP claim of that engine. No, it is not the best way to calibrate it, because I am relying on the manufactures claims, but I should be as accurate as they are, and probably with in about "+ or - .2hp" from actual.
Here is my dyno running, and it is not calibrated. If I change the software input number for the "efficiency loss factor" (the resistance of the dyno drive train), I can make it read anything I want. I have some competition who has inflated claims, (weather by mistake or on purpose) so I did this vid as a joke about it. The rpm numbers are correct, but the hp and torque are almost 3 times what the engine actually produces for power.
For some reason, I can't copy and paste the vid link on here.
Type in "earthsurferUSA" on youtube, and it should be first on the page. You can see some of the red and black dyno console on it.
As for the lower compression I mentioned for the marine application, I raised it back up. Hot and muggy days (like in Southern Florida) effected the power too much with the lower compression.
+EarthSurferUSA The dyno you borrowed as the dyno we developed with Brian Kinney. They were all setup to be as close as possible to each other and has coast down procedures to remove drag from the system.
The manufacturers never had a dyno and 99% of all their numbers were fake calculated values.
+vrcmag
I have wondered if Zenoah actually had their own dyno. But with the inertia dyno I used, (which was also built by a sharp guy--so I am sure he got the flywheel inertia calculations right, and a piece of cake compared to the rest of the engine he designed,--which never made it to market), matched the results of Zenoah's claims in the owners manual,-- 2.8hp @ 12,500 rpm with no exhaust and no air filter.
I got 2.78hp at 12,500 rpm. If Zenoah did not have a well built dyno, they had a pretty good way of determining the power output.
I would like to see more side by side comparisons on current popular .21 and .28 engines that cost 3 to 4x's as much as a stock .21 engine and also tuning the stockers for more power and reliability.
Depends on the engine, if you want a quality engine then you should probably look at a .21 since they are the only size used in racing where quality and power is what you need
It's on a dyno with clean air. We don't run air filter to avoid any performance issues from an air filter.
2 things to remember about dyno's. no 2 will read the same and the numbers doesn't really mean squat. I could make the dyno show my engine has 8hp if I wanted to.
they're not really reliable for proving your hp numbers as they are for testing your mods and tuning the engine.
Good Sound bro. It sounds great !!
Did the camera man just drink fifty cups of coffee? lol
whoa cool ive wondered if its possible to dyno a engine this small
NICE! would be interesting to see some comparison, e.g. with air filter, different fuel, etc....
Very cool! Should run with air filter installed for most accurate data.
Rob M we decided a long time ago no filter largest Venturi.
This is amazing💪🏼💪🏼💪🏼
I haven't been in the nitro scene for about a year. Is this the step up from the 121 VR I assume? Still a 3 port? Also, I see a lot of manufacturers claiming 2.5-3 hp on their motors. Are they testing differently or is this thing way behind. I kinda doubt the latter is true.
Good job congratulatios fron Brazil i love 21 vê reedy
can you make a video for the engine
alpha A852?
I forgot: especially I would be really greatful for a comparison with different venturi inserts.. rpm-bhp wise. If you could schow some things like taht, tha would be cool
Advertised HP isn't based on Dyno results. The X-Dyno is the only commercial dyno that produced real numbers.
sweet dyno set-up
Can anyone tell me where to find parts for a reedy 121 vs now that they've been discontinued???Favorite engine of all time.
is that 1,3hp for 13ccm ??? Data is maybe understandable for dyno-stand-owners, but nor for common people...
Love the 10 speed road bike levers 🚴
I noticed that too, being a cyclist.
That was freaking sick please teach me your ways
This is cool. Great job on building the engine Dyno
dude thats bad ass how much for one of them Dyno set ups ??
Hey love the video I was thinking of doing a swap since I have this engine but wanted to see how much power it made and this video helped a lot I just noticed you guys are running a clutch bell and spur gear is that what is reading the dyno numbers? And could you just run it off the output shaft of the motor? I'm not too familiar with rc dynos.
You can't run off the shaft, nothing grabs it. There is no clutch, it's locked. The dyno software does the computing. A dyno is a simple machine. The gearing was selected for the length of run, and to not have the weigh spinning at such a high RPM.
Pretty cool. I have that engine in a Savage.
Great work ;)
Now that's a great tuned nitro ...man I can't get mine to take the fuel on the mid range
Jason Compton there is no mid. That means you Are too lean on top or bottom.
Could you test the effects of a super charger. To get some hard data about performance increases or decreases. Cause some people SWEAR they add power so could you accurately test this.
@blue03r6
I agree that a dyno can't tell the truth but it's a great tool to test different exhausts and/or plugs under the same condition.
Break-in an engine is also much more convenient than having it on a chassis.
Does anyone know where one can get such a dyno on the web?
What Byron fuel is that ? Is it 30%Nitro with 11%oil or is it 30%Nitro with 8 % Oil? Or even the 9 % oil because Byrons also has that?
Did you build it? Because I would like to have one of those and I was thinking if maybe I could try and build one.
why did you block the air intake briefly after throttle down? btw, you have new subscriber.
+MyFatty69 im assuming to prevent any accidental over-leaning the engine, and to lubricate it with the oil
The dyno tune is actually a leaner tune. So after you rev it out it's actually a bit lean and you get the run on, that just sucks a bit more fuel in.
Wow...listen to that baby SCREAM!!!
So what was the final power read out? Was it one horsepower? It would have been helpful to see an edited text readout of the final figures for clarity
Kerry Kalls that's why the data is all the description 😉
oh my fucking god...i have seen cars puke out guts on plenty of dyno runs...
shit i've even seen a 3000hp dyno max out...
but i've never, ever... seen a nitro engine dyno... on a film that makes it seem like a 1320 video...
internet always slaps me in the face with a fresh load of new
I showed my Rc club at my school this vid
there are rc clubs at your school?
How To MLG yes I teach a class in Rc cars at my school
#212 thats cool :)
Where can i buy one???
holy damn it went over 30000 rpm!
Oscar Thorpe put that on a rc road car, and strap wings on it!
Oscar Thorpe nitro engines can regularly exceed 40,000rpm
How to measure the rpm?
id like to make something like this, how does your starter work? where can I find a drawing that shows a DIY person how to?
+Jonathan Buchanan It's a bump start on the bottom. Modified starter box.
why does the test dyno have 2 throttle levers?
Oscar Thorpe throttle and brake - 8.xxx pound weight spinning at 8000rpm, but it slows down to the flywheel to make a pull.
Is this a force .18 or .12?
Err the engine is in the title of the video 😃
Hello
Whats the max. Rpm?
I have the same engine
Can i use it in a onroad competition car?
Hans Dampf read the description.
where can you go to get this done?.. do they have them in hobbystores... or who's does it?
Dyno? We're the only magazine with it. We helped get this to market over 10 years ago. :)
vrcmag how do we know it's accurate if your the only one who does this besides a program that only exists on your laptop educate me...
How do you get the engine to sound like that and what upgrades can I do to make my thunder tiger eb4 pro 21r engine
Levi Brown I believe they used a stock Reedy .21 engine. There's nothing special about the engine or pipe its just the know how to adjust tuning. Get some help from sombody at a local hobby shop or track that's willing and able. "be careful because there's alot of people who say they know EVERYTHING but will ruin your engine.
And I really mean be careful who you let tune it. My father just ruined his nieghbors brand new engine a week ago because "he knew everything".
Will this fit on my tmaxx
savinitout14 there was .21 adapters for larger engines.
nice I like that
nice
Hi, how much dyno?
It’s been out of production for a long time.
could you imagine if... THIS THING HAD A TURBO?!??! I wonder if its ever been done..
turbos/superchargers have absolutely no effect on a 2 stroke.
+behemothfan666 I've seen plenty of turbo-ed two strokes, Matter of fact I've seen one irl
+Jimmy Alfonso yes I have also but I know for certain that they have no affect on these Nitro and petrol/gas engine's for the baja 5b and other 1/5th scales.
+behemothfan666 after thinking about it I'm sure you're right, with such a small engine it really doesn't need much more air intake
+Jimmy Alfonso yes, I'm not sure if you're know who RB inovations are but they sell superchargers for the baja and 5ive and all they are is a extended air filter that actually can put unecessary strain on your engine. they have a video of them doing a dyno test and with and without their "supercharger " and the readings don't match the sound of the engine's RPM'S. The most power enhancing upgrade you can do with a 2 stroke is a half decent tuned pipe.
sound like a formula 1
a cuantos km/h llega ?
No air filter?
More air flow, No dust and what not around to really get in there anyway :)
more airflow doesnt matter.. thats not why they do it
We're not testing the air filter.
What's up with the Herman monsters music LOL
wow no air filter
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I get absolutely nothing, from watching this video .
Allen Traylor the information is in the info and in the magazine. 😳 and the video shows the HP graph. Not sure what else you are looking for.
@@vrcmag
A clearer image of the graph / numbers , would be good ....
The guy shooting the video never stopped moving the camera....
Look at the last 20 sec.
Allen Traylor the video compliments the magazine which has the data printed/displayed to read. The numbers are posted in the video description.
But again. This is a video tease for the magazine.
No airfilter? That's gotta increase HP
+asdfasdf asdfasdfadsf we're not texting air filters. Tuning the engine to with and without won't make much of a difference.
Mhm. I would have to disagree honestly. You're putting more air into the engine, if you're having to richen the mixture then I would say you're going to be making a bit more power.
+asdfasdf asdfasdfadsf Again, we are not testing air-filter efficiency. We're testing how much power an engine produces. So if it moves the power curve, or even reduces HP a bit it's a constant that is removed from the equation.
+vrcmag So why you guys not even bother to test brushless DC systems on this dyno? Scared to show that they would make more power than Nitro?
EETechs
Why would we be scared of testing something? LOL. It's not news that electric brushless systems create huge power.
hey buddy?
looks like shimano bicycle shifters !!!!!!!!!!!!!!
Personally I think it's a load of bull though.
if he realy knows his stuff why not show results of the pull ...thumbs down check waisted time
Lance Menke read the text🤷♂️
this is cringe