The Most Powerful Two Stroke Ever - Stuffing it!
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- Опубліковано 20 сер 2024
- Gigantic crankcase volume great for on the pipe power, not so much for starting - who would've guessed...
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This is the road to the most powerful two stroke (relative to cc) ever. Aiming for 30+hp from 50cc.
Lofty goal!
Here's a few key points:
- 100% bore width single exhaust port, no bridges, non. This leads to unrivaled blowdown specific time area.
- What should be excellent transfer duct geometry, large radius on inner walls to minimize flow separation, constant side wall angles for control, large duct volume for gentle "delivery"
- Valveless tuned length intake with nitromethanol injection, aimed at the transfer inlets.
- Ridiculous crankcase volume, no piston pumping here, it's all about resonance!
- Tuned pipe, tuned crankcase, tuned intake, tuned everything, resonance!
To be able to run such an monstrosity of an exhaust port without instant catastrophic failure there's a special two-piece piston with a retained piston ring(thanks Mark Atkinson). It has no holes in the skirt either, no short circuiting between the transfers and the exhaust.
I've designed the whole thing from scratch.
3D printed, cast(lost PLA), and "Nikasil" plated the cylinder myself in my garage. Designed the case and pipe for it. I've received lots of help from the community with things I haven't been able to do myself(lack of machinery and/or skill)
Especially machining, until recently I didn't even own a lathe.
Thank you guys, you're the best!
I've designed and built a landspeed bike for the engine, plan is to set a new class record at Bonneville.
Thanks for following the adventure, and fear not, I've already got plans for the next project - Symmetric transfers, four exhaust ports, two rotary valves(but not where you think they'll be), forced induction, no need for expansion chamber(!) ++
Many years of two stroke madness up ahead!
Easy is not worth anything
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He did it he did two stroke stuffing
lmao
That family guy joke when they say the name of the movie in the movie
Ditch the fiberglass pedals and get polini sheet material in .025 .030 .035 and .40, then play with stackin them and cutting out half moons to dual stage to pedals
@@KevinTPerformance or boyesen carbon fiber reed valve sheet
@@AmirPomen we took the metal reeds out of our Yamaha bikes and put in Kevlar reeds and a better tick over and at higher RPM the Yamaha RD200 it give more power and the ,2stroke oil has the best you can get and the oil tank were kept full and just a little in the tank as with higher revs and I can say it made a better bike to ride,
I've been following your build for almost 2 years now, im smiling from ear to ear. So happy to see it running,
God jævla jobb, hilsen fra Sverige
I too have been watching for almost 2 years now and i am so stoked to see this
this guy has made an engine at his backyard, unbelievable stuff, how this is possible, earlier I thought it is impossible to make an engine at home but this guy proved it to the whole world that it is possible to make an engine at home. and not just any engine, he made the most powerful 2 stroke engine the world has ever seen. This guy is like the ultimate engineer who did designing, manufacturing, and now tuning and everything possible at his backyard, WOW man what a great man are you. this man deserves great respect and also he was so kind that he provided every bit of information about his engine on the internet.
Thanks for the kind words! I've had lots of help with machining tho, No mill yet.
Its the standing in the shoulders of giants thing. Taking a solid start based on well understood theories and rules and a passion project pushing it further.
Watching this move from a modified moped case has been really interesting as he shifted from modified to pure performance prototype.
One thing to remember is this project would have floundered without a whole crowd of very clever people throwing ideas out there and the fact he is working with a 50cc single engine means that machining time isn't going to be insane and material costs are really low which helps.
This isn't going to be the most powerful 2T ever but it will be 9ne of the most powerful 50cc 2T's ever made. Im going to be reay interested to see the BHP/Ton figures on this thing. It will never be a panacea given its designed for WOT and a single rpm but its one hell of a project.
I have a 27cc Strummer motor downstairs waiting for disassembly partly insp8red by this build. Getting back to t8nkering with 2T stuff
@@2STROKESTUFFING man you are really one of the greatest engineer and I learned a lot from you, thanks for inspiring us
So glad your sharing all of this with everyone, keep up the great work man!!!
Had these ideas. For oil filed bladders in the crankcase to change the case volume on the fly. Also a spring tensioned manual controlled sliding exhaust tip bleed to change the backpressure and soundwave pitch manually
Oil filled bladders is a magnificent idea. Just 5mins ago I was playing with the idea of water bladders, but in case of failure oil would probably reduce the amount of carnage.
This is the best 2 stoke channel ever
Thanks man!
Excellent cant wait to see the fuel injection side in action.
Llp
P
P
@@andreethoelen1551 stroke?
Thomas McCabe Looks like he had more than 2 stroke.
I put carbon fiber reeds in my kart engine. Helped the top end.
Never give up 👍😎🏁
Lol
Awesome, man ... you did it! The first thing I was thinking “when will we hear the ring break!”? Never came. Kudos !! Almost there! Super cool stuff.
iv'e watched everything in this journey,and relate extremely well to all the ideas and experiments,im just the same,learn,make mistakes and move on,in my circles terms, alex is a "doer" top bloke,he is an inspiring character,and due to youtube and other social media,we are all witnessing something amazing,we are all behind his endeavours and his willingness to educate himself to prove something,be it right or wrong,i'm hooked like many others....in a negative thought......this will end at some point,but bugger it,this is like no other insight into another mans passion and struggle..big up to "mr stuffing".i salute you.
I like it, developing ideas and engineering it at home keep at it. Allen Millyard is a great engineer too, I enjoy watching you both.
Damn, that's a short tuned length!
As happy as I am for the channel growing, sooo many noobs who think they know what they're talking about (or understand what they're looking at) in the comments section these days..
We aee at a point with this where its so far outside of whats done commonly or even in speed trials that... the next problem solved could be by smeone clueless who doesn't know what he doesn't know. Has no idea X 'can't be done' just as much as it could be someone whose well versed in this sort of things.
I mean, constant rpm, a moving engine to put tension on the belt to get the cvt to cope with the power. A solid one piece ring thats softer than standard hardness. We have shifted so far outside accepted 2T tuning wisdom we have bugger all to go on but fuck it test time.
@@jediknight1294 I get what you're saying, but It's the "it needs an expansion chamber", even when he shows one in the very video, or 'this is pointless, look to late 70s' dirt bikes' (like 2t evolution stopped there) comments i'm talking about.
Swinging engines tuned for certain RPM and CVTs are nothing new in the moped world, neither is controlling the variation manually, specially on french bikes (le resistance). This is all about achieving a 360-degree exhaust port. The resonance pumping action, large shaped case volume, and primary intake with injection, (making it essentially a pulse-jet piston engine), are icing on the cake.
@@macelius oh I know the CVT is nothing new but iv never come across the idea of moving.the engi e to keep the cvt in the powerband.
interested to see what happens and how they affect things because Sooooo much moped tuning lore is based on 'feel' and the reputation of the tuner/person talking about it. Theres so.much bollocks in the industry designed to rip off 14yr olds.
Must admit I'd have gone for a conventional gearbox by now tbh but I hate CVT's with a passion tbh.
I know what you mean about clueless though, currently having a discussion with a guy on this videos comments who is calling me an idiot and clueless and that iv obviously never worked on a 2T before because I didn't agree with him.that it needs an expansion chamber and shouldn't be fired up until the exhaust has been made who then talked shit to me because iv commented that a straight pipe.is fine for development work where you have no idea whether a ring will die 30s in because apparently building and developing an engine from.the ground up is totally the same as buying parts online then bolting them to a 2T moped or dirt bike.
@@jediknight1294 Exactly those kind of people. They had a goped when they were 13 and they think they know more than he does.
Of course, even a straight pipes tuned length is best for a certain rpm (and it looks like this one is about the same as the expansion chambered pipes tuned length is going to be); the wave is not shaped and the scavenging effect is not magnified, but it's there. Racers realized this in the early days and started cutting their pipes down, then came trumpets, then came chambers. Then came computers.
Anyway, imho if one hasn't at least done the math and tuned their own ports, pipe/chamber, intake length, etc, then built that engine, tested, re-tuned, etc at least a few times over, one probably has little to offer Mr. Stuffing in the way of technical advice, and should probably stick to encouragement and paying attention trying to learn something :).
@@macelius iv done some tuning and some of the maths though I used a lot of help with a platform that has had a lot of R&D so know my limitations.
When it comes to total one of R&D, I'm somewhat out of my depth but I understand the principles.
Crankcase stuffing was tried in the fifties ,sixties to no advantage and in the late seventies Suzuki started opening up the crankcase mouths and transfers to aid inertia as it was found that the easy movement of the fuel air mixture "up stairs" was better.They also added massive reed valve blocks and huge inlets too.
When you say "to no advantage", you mean for power. He is stuffing the cases just to get it started. The Suzukis probably would have started quite nicely with the cases stuffed, but not had the power
Yep. With the volume I wanted for peak power it's proven very difficult to get it going at all...
About the assembly lubrication. I've started using biltemas chain-lube when assembling, very easy to apply and it's sticky and stays in place where you apply it and doesn't run away and end up somewhere else when you're about to start.
Great tip!
@@2STROKESTUFFING try it as cutting-drilling oil works great also foam filter lube(bar and chain lube)
Man, that thing is going to rev like crazy. You can tell by the sound of it.
I'm loving the build. The idea of building a motor from scratch must be so exciting! Well done! From South Africa
From scratch dude!!! I consider myself pretty good at small engines but you have taken it to a whole new level...You have my absolute attention.
Just put thicker 0.40mm Polini Carbon Reeds and install a pipe the next time to start it, cant wait to see that thing pull on the road !
no road. bonneville.
Great Stuff
Your all fired up again ! the only restriction now is Mrs Stuffings curfew laws
LOL@ "Mrs. Stuffing".
'Mr. and Mrs. Stuffing', that's gotta stick!
happy that the major hurdle of the ring question isn't an issue! can't wait for next update!!
Alan millyard is on another level to the rest of us. He surprises me every time 👌
Yep
I think you can reduce the ignition advance by one or two degrees,because at this prototype stage without exhaust you don't need much ignition advance.
You cannot follow the ignition advance that the rotor manufacturer recommends.They usually recommend an ignition advance based on more than 80cc.
Im surprised the ring didnt snag! To me that seems like the most likely point of failure. The fact that works is quite the innovation!
Yes yes i thought the ring was a problem but it seems to work very nice... i hope you can run you engine this is a very cool progect i am wating for the secondary intake and the injection sistem
@@lorenzotesta7794 why is he using a 4 stroke straight pipe exhaust instead of a 2 stroke expansion chamber?
@@killaz123456789100 He showed the soon to be pipe in the video.
@@killaz123456789100 until high rpm, 2-stroke will run good enough with no expansion chamber.
@@adamberggren5815 right but hes trying to start it with a straight pipe lol
It make me a smile when the spark of life begins.And the rings survived the test that is really positive response from the engine run.You nd ur project is insane.Its R&D of an epic built.Now you are decreaseing the crankcase volume.
Now, thats some progress. Im glad you started testing the engine setup!
man this is some incredible workmanship and labor just for this engine. There has been so many problems XD
Backward Engineering at its best
Heck yeah! So happy to hear it fire up! Great work
Congrats 100% of bore exhaust and it runs! That is worth a pat or your own back, my fingers are crossed that you will be able to exceed 400hp per liter reliably! Truly inovative!!!
Thanks, it's awesome! My "old engine" produces ~450hp/l, hoping for >600 in this one...
I seen that your aiming for 600 truly inspiring! I remember when you hit 20hp I was jumping up and down right along with you 450 is impresive enough! I personally took a 130hp 799cc rotax to 170hp n/a and it runs awesome nothing compared to your accomplishments but along with lightening up my chassis it has made for an entirely different realm of machine than where I started from. I can't wait to see you get it up on the dyno and back to the flats in Utah great work man keep it up! Truly amazed by your inovation!!!
Great job ! You are missing one thing though. 2 stroke motors have a specially shaped expansion chamber exhaust. It is a must have on 2 strokes.
Thanks, pipe is coming.
Now, this was proper 2STROKE *STUFFING* 😎
It's been a long time coming, and I'm proud of the whole project. Keep on it m8, your eager is just as big as ours!!
I love the idea of integrating the tuned intake valve to also restrict chamber volume, killing two birds with one stone.
Just amazing.... loving the care you are taking and also seeing the thought process.... some stuff works, some doesn't. Thanks so much.
How did i not notice i wasn’t viewing in the right order! Now i have to start at the beginning and watch in order, yipeeeeeeeeeeeeee 😊👍
Hyppigheten av videoer har økt betraktelig :) Det blir artig å se om du får dette til slik du ønsket :)
2 stroke lives
If the crank case volume is too large, perhaps a variable crank case volume is in order? Similar to a choke, could have either
A: An elastic bladder with a thin steel plate that is pushed by a pin on the outside to "Inflate" it
B: Change the crankcase design to have a plastic shape that you can "Tuck" into the available space when it is running, and extend when starting.
As another comment stated, you may also have a fuel supply issue with that dip in the fuel line as well.
👍 I'm shortening that line, and both A&B are definitely options to explore.
Primary compression is a big deal with the little chainsaw motors I build. Partly because they are SO over square. I wonder if there is a way to "vary" that volume to optimize as the RPM's go up and the pipe begins to work. Husqvarna "performance" oriented saws like the 562 & 576 have crank stuffers to jack that primary compression. One difference being in addition to being really over square, chainsaw motors have "pressure can" exhausts as there is no space for an expansion chamber. ( Still would be totally off beat and cool using an electric super charger / pump to pressurize those cases to at lower rpms to get things started :) )
Just what I needed to get thru work... Doesn't matter if it's motors or wood working love all the videos keep them coming
I hope you smash the record you deserve it
I believe after 45 years of working and diagnosing two strokes I think the only reason it runs at high rpm is due to the lack of compression try using copper for the head gasket as the heat will not cause damage and the second thing is I think the ring is not made of the right material hence causing lower compression. Don't give up just remember Honda's V-4 two stroke that kicked ass after they went to one crank, the first bike to top over 200 mph.
👍Might be that progress so far has mostly been because the ring is seating, have to do a control run without stuffers in there. New piston/ring is in the making.
Im doing the same using a yamaha jog reed cage in a honda dio housing with a walbro hda 76b carb on.m a stihl ts440 cylinder mated to a custom modified chung yang 46cc crank case and bottom end with a ada racing +1mm stroker with boyesen ports custom made by me with boyesen ports also by me, with a yamaha yz250 exhaust pipe with a modified headder to run on a goped gsr scooter. It comes out to 64cc about 17 hp at 20k rpm with room for 21k. (Currently double ring piston might go custom weisco piston or modify something 49mm bore off shelf
Getting closer All the Time, well done 👍
Clean the pilot jet it will idle way better ! Love the build can’t wait to hear it get on the pipe
Back to engines yes!!! Awesome stuff Alex! 🙂
It's alive! Good work sir.
Opening windows in my brain.... thanks again buddy...😁
Could also make some sort of bladder or bellows design for that crankcase stuffer thing so it's adjustable inflated during startup and deflated while on pipe.
Been thinking about it, not ruled out yet.
Good to see the ring working, it might pay to warm up the crankcase a bit with heat gun before trying to start it on petrol, methanol works fine with a cold crankcase, petrol in my experience prefers a warm crankcase.
"Starting to run like a normal engine" 🤣 good work man!
Great progress, great watching from the UK
You cannot get a consistent thickness with sanding the reeds so the flex won't be even and they will crack.
Is due to backfires, reeds are not made to stand them.
@@framegrace1 or you have cause and effect backwards... if the reeds fracture first then it will backfire. You cannot have an inconsistent thickness, they will just break. That comes from 40 years experience of racing two-strokes!
Send him some reeds with a note then
i mean 20000rpm probably wont need to shave reeds
@i don't believe in the sun ever?
So happy for you pal, I hope your grinning like a Cheshire Cat, because I am......genius......personified....... we salute you! X
In the reed valve try and use Kevlar reeds. the work better at low rpm and at high rpm
thanks man for the effort you put into inventing and making videos!
I cant like this enough. Pity we’re not able to repeatedly smash that like button
When you'll have time, take a look on a super lubrifiant (only natural products. No industriel garbage) Meca-run P18. On 2 stroke you put 2% in your oil. It's totally indcredible! More less wear and
increase compression.
It is so efficient that you don't use it during break-in.
Castor based oils and synthetic oils both have their pros and cons. There is no such thing as "industrial garbage".
This was always good, but now its getting fascinating! You go Viking man!
Once you get it running 100% maybe you could fit some kind of power valve help out with the bottom end power
Great tip, but not necessary with a CVT.
I think we all need a 2stroke project......
Look into rotary valve induction when you make the second version of the case. No more broken reeds, much more volume of air/fuel flow through it, and no relying on atmospheric pressure to get the valves open.
Also, that huge case volume is always gonna be a problem even on the pipe. IT has to be small enough for the piston to compress the charge in it enough to actually yeet it into the cylinder to begin with.
I agree about RV vs reed, but... That reed intake is just for starting/low rpm, there's a secondary intake with no valve at all for power. In the powerband, with a proper pipe and everything else built to suit, piston pumping really has nothing to do with getting fresh charge transfered into the cylinder, the pipe does all the work. High volume is better because even though the case/cylinder pressure differential might be larger when the transfers first open, the average pressure differential can be higher. Better transfer control too, not an initial squirt.
@@2STROKESTUFFING I've got a chainsaw with no valve at all and it runs pretty mint tbh. Open the carb, peek in there, can see the conrod, piston clear as day. You....could probably do away with the reeds entirely if you had a smaller plenum area and thus got enough vacuum to make that work for startup as well.
Maybe a variable plenum? If that's possible, some sort of RPM-sensitive valve that opens up a larger plenum area as the revs increase and it comes onto the pipe? Or perhaps a small roots type supercharger that declutches itself once the pipe can start helping with scavenging.
Might be some plenum+supercharger stuff in the next build... You sure that saw isn't piston ported(piston controlled induction)?
@@2STROKESTUFFING I'll have to have a look at it in a bit but I think the piston actually goes below the intake port. McCulloch 10-10S I got for free, saw bits all jacked up so I will prolly modify it for rc purposes. Thing runs great!
Im loving this series!!
WELL DONE!! this is brilliant stuff. It is also very bad because thanks to you and Allen Millyard I am not getting any work done :-) I am really looking forward to the next video, you have done amazing work and there is plenty more to come.
These are the problems anyone faces with huge transfer ports, I had the same problems when I ran TZ 350 barrels on my 350 LC road bike & it was great once you got her revving but was utterly hopeless all the rest of the time which is where most general riding falls into :-)
Loving the high RPM 😀😀😀
I think the progression of the mjn yoshimura needle will smooth out the starting even better
Woke up to a new video.Thank you!
You finally got a pipe! At 6:10 i can see the stock pipe of derbi drd pro, try that on it 😂😂😂
"you can't just revolutionize the auto industry"
"Haha 2stroke go BRRRRRR"
not sure if its the sound quality or that massive exhaust port but it sounds sick and has a very unique sound.
I know this may sound stupid but I think maybe it’ll help to have a more dirt bike styled fatty pipe for back pressure to help it run rather then the straight pipe, just a helpful suggestion 👍
Dam that pipe looks so nice
so nice to see it turning man
So close! Bring it on 2SS!
Have you ever seen the pipes that were designed back in the 60's and 70's i think that the pipe was allowed to "slide" back and forth to help its "tune"?
Another very complex item for your motor but I always thought they were a great idea.
Also, im sure you covered this but did you ever get your cyclinders properly nickeled?
I, AS A 2 STROKE LOVER, AM VERY PROUND OF YOU!! IT DOES RUN!!
They're a great idea, but not needed in this case - constant load/rpm.
Good too see you back at it, excellent video as usual!
If the reed scratches are perpendicular to the bolt pattern centerline the stress risers seem to favour the inconsequential.... less flying chunks. Riding into the fatigue twilight zone?
Edit: wrote this at the beginning from my own hindsight. It's actually good that it cracked. You'll be able to share your solution if it's more than just the right material thickness.
This is like ASMR for gear heads.
I’m excited for you!🤘🏼
This is exiting... A lot of success in one video there mate! Keep at it.
omg you did it
It's a common misconception that you want back pressure from an exhaust. But no motor in the world would benefits from back pressure. It's velocity you want a bit of witch unfortunately will inherently causes a bit a back pressure.
Shaft valve induction + schnuerle porting .Look it up The rc car lads are getting 2.5 bhp from 3.5 cc engines.!
Already schnuerle porting, and a step beyond rotary valve - "resonance valve". Not sure I can beat those tiny engines tho, but won't give up without a fight!
This is so addicting to watch!!
He does have a purposeful walk, Mr Millyard.
Sure do!
Reeds fallen on duty, RIP with the honors 🥺
There's room for a tool kit 'down there' 😁👌
well done Bro this is looking good
Great work as always - good to see major progress and getting it running with the ring mods is a massive milestone - brilliant.
You'll need to sort out an improved starter system; I'm crapping it that you'll twist your wrist when it fires!
Thankfully 2T bikes rarely kick back in the way that the 4T bikes do. Im expecting him to use the boardtracker system or a roller system when he has the engine in a chassis.
@@jediknight1294 2 strokes kick back the same way a 4 stroke does.
@@steve-o6115 iv never really had one be particularly nasty tbh.
I'm far more scared of kicking over 4T bikes. Saw a guy showing off outside a bar get launched over the handlebars into a lamppost by his ktm. The first of the Superduke series 990cc iirc and a mate of a mate get his leg broken by a 4T dirt bike that was highly tuned and just evil to ride. At the time I couldn't actually start it in less than 3rd because I wasn't heavy enough to keep the thing from looping.
That telephone call, the neighbours; "stop running that loud motor please".
After you finish the final version, you should add more cylinders.
😁
Awesome work man! Glad to see it paying off for ya!
That has to be the meanest sounding 50cc engine I think I will ever hear...
How did I get here 😂 can somebody explain to me what’s going on. Don’t know how I got here but I like it lol
this guy's going to bonneville to claim the record for the world's fastest 50cc motorcycle.
to get the power needed, he's building a two-stroke engine that has an exhaust port that runs the full 360 degrees of the cylinder.
other main issues include the transmission - cos the engine is designed to run at 20,000 revs.
You're amazing. Keep up the good work. ✌
Keep the vids coming !!! 🤘🏼
I really like your ideas on high RPM's but my two stroke is a chainsaw, old vintage machine with all exotic metals for major velocity. No real room for a fancy exhaust system. That is my achilles heal. Also, to much RPM and the oil just is flung from the chain and bar. Like your ideas, hope you make things happen. Peace and stay virus free too. VF
well, i suppose you can make a small expension chamber as an exhaust, since they have small engines with fairly low rpm's it will not need a big one
There’s absolutely space for a real exhaust on a chainsaw 👍 ua-cam.com/video/8W2BjSPFUFQ/v-deo.html
If higher rpm just flings off the oil then switch to a thicker more tacky oil. What i do on gopeds. Also blueprinting and porting a engine for more low end torque without more rpms is a thing. Another trick i learned buding weedwackers tailor tunned to the rider and race tracks
I was thinking that dirtbikes would be a good place to look for engineering focused on mid rpm power. I wonder if a small box style exhaust could be made to function like an expansion chamber. If you could find a way to fit a long pipe to the saw, that would be a huge power increase.
I blow exhaust off my chain saws on the reg.
could you make a crank case that physically gets bigger as the engine gets going?
That's kinda what I'm going for, not continously variable though.
@@2STROKESTUFFING How about a variable crank stuffer, just to get it starting easier?
I'm sure you could find some V Force Reed petals that you could probably use and modify for your application
Good luck. This is gonna be awesome!
AWESOME.!!!