The Most Powerful Two Stroke Ever - Won't be long now!

Подписаться 203 тыс.

Просмотров 96 тыс.

50% 1

You won't believe it, I'm actually getting this engine ready for startup now! Will the humongous exhaust port swallow the piston?
T-shirts, hoodies, stickers etc
teespring.com/stores/2stroke-...
Support me on Patreon!
/ 2strokestuffing
Donate to 2STROKE STUFFING
www.paypal.com/cgi-bin/webscr...
or
www.paypal.me/2strokestuffing
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
Instagram
/ 2strokestuffing
facebook
/ 2strokestuffing
DIY Arduino dyno shield
ardyno.weebly.com
Unfortunately I have no more cards in stock, and I'm struggling with finding the time to do order handling, shipping etc.
Here's a link to the files, you can use them to get the card manufactured at your pcb supplier of choice(not expensive at all for just a few)
Make as many as you want, sell them if you like!
A small donation would be much appreciated!
PayPal to 2strokestuffing@gmail.com
drive.google.com/file/d/0B51y...
Twostrokerider
www.twostrokerider.se
Twostroke.se
www.twostroke.se
Treatland
www.treatland.tv
Emot Racing
www.emot.nl
Get Simpledyno here:
sites.google.com/site/simpled...

Авто/Мото

Опубликовано:

23 авг 2020

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 482

@joprey844 3 года назад

I've made a decision and this will please you! - This is my favorite phrase!

@pabitrikalita3940 3 года назад

I have never seen such a big transfer port on any 50cc engine, this is the biggest one

@valentinozerbinati8349 3 года назад

⁶y

@tritiumrecords717 3 года назад

My tz had 8 transfer loop scavenge ports, bridged of course, 4 really

@baby-sharkgto4902 3 года назад

I haven't watched this entire series but can someone tell me why he doesn't simply bridge the exhaust port?

@routmaster38 3 года назад

In the early eighties I was given a worn out cylinder barrel from a very fast works Suzuki 250cc moto cross bike and noticed it had massive transfer ports ,(no attempt to stuff flywheels etc)and very wide inlet reed valve block.The secret is easy flow using inertia rather than hi primary compression aided by well sorted exhaust system.

@2STROKESTUFFING 3 года назад

Word to that!

@riccardo7352 3 года назад

just weld up a bridge in the exhaust port

@JJONESMX09 3 года назад

Yep, agreed (its only 3 to 5 % difference in flow anyway)1.5 mm is the minimum width is all that's needed 👌 .... Piston ring bounce (in and out of exhaust port) in milliseconds will kill the power, as well as the port... Keep up the good works 👌.... The Joneses'

@daveswarbrick5576 3 года назад

That's what i was thinking, a small bridge would have little impact on gas flow and stop the ring expanding.with such a wide port it would help support the piston and stop any rocking in the bore

@thomasl.7700 3 года назад

Totally agree here. 100% exhaust port sounds too nice BUT, 95% or something is sufficient to create the fastest 2 stroke my man (for 5 minutes of running it, before it dies, imagine tuning it ;) Oil distibution is so crutial @ 20000??. If you want to place the "stationary" ring below the exhaust port, you have to craft sooooo many cylinders and receive a lot of these nice pistons until you will be able to make it to 30+ hp. Better take it step by step. The precision of of measuremennt needs to improoved as well. What is the aluminium grade of your cylinder and the one from the piston?? Tolerances are key for high power! Greating from your donating engineer from Germany :*

@ferrumignis 3 года назад

@@JJONESMX09 A 1.5mm bridge sounds like a recipe for seizure. Exhaust bridges run hotter than any other part of the cylinder, the thinner you make it the hotter it will get.

@JJONESMX09 3 года назад

@@ferrumignis we have done this before with successful results, there is a few key factors that wold need addressed; ie: back cut... ceramic coatings.... aluminum support behind the narrowed face (heat sink) would of course be wider.... Again, proven results in these situations ( land speed) will work. My Grandfather Don Jones has numerous cylinders around in storage with this same exact setup ...

@bobbythomas1242 3 года назад

Your exhaust pipe expansion chamber is going to have to be massive with that kind of geometry and power/flow expectations and demands. Good luck I can't wait to see it run. Good luck

@2STROKESTUFFING 3 года назад

Thanks! I've got a pipe drawn up!

@PHUSII 3 года назад

That cylinder ring idea is interesting. I'm thinking it would have to be a lot more taller than a normal ring so the slope is like 89 degrees and at least 3mm tall. Because if its just 1mm and steep sloap, when the piston comes in contact, it would snag right on to it and destroy itself. Make the slope long and minimal extrusion so that the piston travel on to it is really smooth. Just my thought on the idea!

@traceanthony3588 3 года назад

Smart approach

@e.j.newell6128 3 года назад

The piston is pretty soft. May not last very long. Also disengainng/reengaging would be pretty violent

@gpc1091 3 года назад

Hi, I think a bridged exhaust port would solve your problem. Keep up the good work, this project is fascinating!

@ttmfinland_yt 3 года назад

yeah it would but that is not a 100% wide exhaust then. My engine has a 94% wide exhaust port but it has a bridge and it can never get to 100% of the bore with a bridge

@mikesrcgarage 3 года назад

I would think it does not need to be 100% but it does need to work without failure, a bridge might help that problem... Idk!

@gpc1091 3 года назад

@@ttmfinland_yt In theory, 100% bore would still be possible if the port was wider than half of the circumference.

@wags9777 3 года назад

He purposely stayed away from that. Earlier video

@2strokejunkie686 3 года назад

@@wags9777 well it's really the only reliable method that comes to mind, I'm sure he will find a way tho.

@isaachunt5292 3 года назад

As an idea, and I'm an idiot that hasn't played with engines much, or for a while, just messed about with motorbikes as a kid. But how about using the lower pressure of the crank case, through a hole in the piston behind the ring, to 'suck' the ring tight to the piston as it passes the exhaust valve?

@2STROKESTUFFING 3 года назад

I like the direction you're going in!

@AdmV0rl0n 3 года назад

@@2STROKESTUFFING Well, that will cause a form of drag right? Which won't be what you want...

@einotorkkel9817 3 года назад

And this is why I didn't cancel the patreon subscription when you told you needed a little break from this build! Love the piston ring idea! Greetings from Finland!

@2STROKESTUFFING 3 года назад

Thanks man, means a lot!

@mrolsen6987 3 года назад

@@2STROKESTUFFING I can assure you that if I only had a penny left when I have payed My bills you would have it. All your ideas and this monstrous build you'r prototyping must come alive! Cheers from your neighbor in Northern Sweden 🍷

@Garaza-po9mq 3 года назад

Finally great to see you in garage 💪💪💪💪

@mattis8205 3 года назад

Ring in the cylinder wall! Wow. You sir are a genius. For real. I love watching this channel for all the clever solutions you come up with.

@joncountegan5782 3 года назад

Dude, the log cabin is cool. Something to be proud of, glad to see you back in the garage. Bonneville 2021!!!

@2STROKESTUFFING 3 года назад

Thanks!

@mattshearer89 3 года назад

Glad to see the 2 stroke motivation coming back Alex. Though I love the log cabin content. Anything you do you do with true passion of learning 👍 Keep up the good work brother! ❤️

@2STROKESTUFFING 3 года назад

Thanks! I'm still working on the cabin, will post an update soon. It's really helped, I'm back with more drive than ever!

@danielhuffman2318 3 года назад

I love the fact you do what you want. Keep them vids coming

@shaunpc2512 3 года назад

I do admire your persistence with this project and truly hope that you succeed in your goals with this whole concept. I wish you the best of luck and look forward to seeing the next stages of development, it’s as much of a learning experience for me as it is for you. Take care and keep on cranking away at this project 🤘🏻

@dunichtich100 3 года назад

Glad to see you back on track with your project! Ceep up the great work! 😊👍 PS: to the cliping piston ring idea, you can try it and I wish you that it will work. Just some thoughts from my perspective to maye make it work are the following: 1. The snaping ring, will be under high variating forces snaping in and out of grooves, make sure it wont break 2. The edges of the groves have to be strong enough to constantly overcome the pressure of the ring, snaping in and out of the grove, make sure they are hard enough 3. Check the expansion-speed of the ring, so that it has enough time geting in and out of the groves even at really high RPM's. The harder the ring, the faster it will expand but also it will create more pressure on the grove edges snaping in and out (refering back to point 2) so keep in mind that you have to find a sweetspot here.

@chrisborns5972 3 года назад

Your ring idea while it may not be the solution it truly a genius concept. I hope it works out

@ericschumacher5189 3 года назад

@2STROKE STUFFING Everybody is talking about (ABC) engines and going NO ring but, something to consider that a lot of these engines don’t have (at least to the extent I’m thinking) is gas sealing grooves. Small model airplane pistons will usually have ONE symmetrical groove at the top of the bore where the piston ring would normally be, but if you look at industrial applications of large pneumatic valves or small high pressure pumps from the diesel industry (my field of work), they have non symmetrical grooves both radially and axially that gas / liquid flow in one direction only and inhibit it in the other. These types of systems are usually under enormous pressure for diesels (1800-2600-bar fuel pressure) / in high pressure pneumatics closer to the compression pressure of your engine at max BMEP, and they work really well. It takes some CFD / ALD to get the force balance correct but, when done correctly friction is minimized down to the liquid friction of the medium compressed, and leakage can be very low if the clearances / thermal expansion is well understood......I believe there is merit in looking into this technology and there are a lot of research papers of reference available (primarily for pneumatics)......the primary benefit I see in going that direction is there is NO maximum piston speed based on ring flutter and any port geometry / port edge condition is possible because the piston skirt provides a huge bearing surface.....the limitations i see are getting the clearances correct for your application as well as controlling thermal expansion via. thickness of the cylinder wall / cooling to retain the desired dimensions at peak power for the duration of the run at the flats.......In my opinion this would dictate needing a cylinder liner of some sort and coatings like an (ABC) engine but from industry there are some other more durable / thermally stable solutions.....powdered metal “Stellite“ cylinder liners already exist (which have a VERY low amount of thermal expansion and are VERY hard)......and a bunch of coatings exist for aluminum such as DLC and AlTiN, both of which are several times harder than chrome, but have more flexibility. If you enjoyed this comment please thumbs it up! I hope it’s gets enough traction that he sees it.

@nhytg376tgyuu765gjmg 3 года назад

Like it! So these special grooves works a little bit like a Tesla valve? I think ringless is worth trying. At 20k rpm there's not much time for leakage anyway.

@ericschumacher5189 3 года назад

@Olof Palmolja you care correct it acts just like a Tesla Valve and your also correct that at high engine speeds there’s verily little time for leakage anyhow.....the important thing would be the clearances are stable for the duration of the run so the leakage / force ballance is ideal when at max power.....from some playing with high performance 2-strokes myself in Karting the piston to wall clearance is large for a sleeved engine, so it’s likely the pseudo Tesla Valve features on the piston wouldn’t work until maybe a mile into the run (once the piston expansion closes the gap to the cylinder liner).....the only way to further mitigate that would be a piston with even higher silicon content, but there a point of diminishing returns that will make the piston brittle / fragile...to me I think all this is a good trade off considering how long a run at the salt flats is....being down on a little power in the beginning vs. being down on power the whole run because the exhaust porting had to be reduced / compromised for ring durability.

@roel-8496 3 года назад

Piston ring design is a very complex topic. I like your way of thinking with the piston ring in the cylinder wall. However, I doubt if it would ever work for a number of reasons. At first, the piston will hit the ring with a relative high speed, I guess that this will damage the ring fast. Secondly, the piston is not capable of transferring the heat of the piston to the cylinder wall via the piston ring during complete piston stroke. Also, exhaust gasses flowing along the piston ring will heat the ring which causes it to burn the lubricating oil on the piston. This will cause excessive wear and engine damage. Ramping the port is worth a try with a thick piston ring. This will prevent having nightmares over a 'cylinder wall ring' design ;)

@sethpaulson7632 3 года назад

My friend...... NEVER STOP A HONE IN THE CYLINDER!

@sethpaulson7632 3 года назад

Or a reamer!!!

@2STROKESTUFFING 3 года назад

Thanks for the heads up! I'm a bit careless with this one, will need boring/replating anyway(or maybe a sleeve)

@sethpaulson7632 3 года назад

@@2STROKESTUFFING sleave!

@salvatoremilitello8490 3 года назад

@@2STROKESTUFFING @Seth Paulson I agree use a sleeve and bore out until u get a compromise maybe 98%bore exhauste in a vertical oval-shaped exhaust or just fine tune the % of bore u can achieve and then make the one that will not catch

@pahafico2 3 года назад

@@2STROKESTUFFING fast honing for 2 strokes (fast up and down movement), 4 strokes dont require a steep cross hatch angle, but with 2 strokes you need to move the hone fast up and down in order to receive a steep cross hatch angle, which retains oil better, because the cross hatch pattern is much more defined.

@ma61king 3 года назад

I'm also voting for the bridges in the exhaust port to support the ring. It would also be really easy to implement if you're going to sleeve the bore, saves throwing away another barrel casting too.

@2taktfriseur 3 года назад

nice mate im come home from work 10 mins ago now i enjoy your new video thanks

@edutter9261 3 года назад

I never hone a cylinder side ways (horizontal) . Gravity pulls down on the hone and ovals the bore (the weight of the hone pulls down so there is more force on the bottom of the bore). I also never hone a bore dry. I use to bore cylinders for other shops as well as mine. I say that just so you know I have had experience.

@coolhandluke1503 3 года назад

I could see oil flicking off the hone.

@tiny180 3 года назад

Did you see how much it was moving its way out of shape you are very right it's not right at all

@Mr360whip 3 года назад

I've been following from the very start. If your into 2 strokes you can learn alot from him. Very clever, kinda relaxing watching the vids. Keep it up mate.

@mhbh1979 3 года назад

Some RC engines used what they called ABC. Aluminium, brass, chrome. Basically a very slightly tapered bore with a hard chrome plated liner running a high silicon content aluminium piston. Not sure if it would scale up to a 50cc cylinder but certainly worth some research as they had no rings at all. Keep up the awesome work😎

@nhytg376tgyuu765gjmg 3 года назад

I guess it's not scaling up well because the ABC engines rely on the fluid as a sealer and the fluid molecules stays the same size and gets to small relativ to the piston? And also because smaller engines revs higher. In theory it is possible to mitigate by going multiple cylinders like 5 x 10 cc. But probably to cumbersome to build by yourself, atlest from scratch. An alternative is to buy RC engines and put them together to one 50 cc engine (smaller engines shall also be more powerful per cubic, in theory. But maybe it's against the Bonneville rules?).

@nhytg376tgyuu765gjmg 3 года назад

It will probably be so eventually.

@bigcheese781 3 года назад

Went from my garage where I, for the last 3 hours, was honing and saving (hopefully) my 2-stroke cylinder, to watching reaming a cylinder on this YT garage... Had enough cylinder surface for one day now really! Luckily, a new one starts in 15 min...

@hog1450 3 года назад

Interesting, can't wait to se it fire up!

@AxlMetcalf 3 года назад

That ring idea will definitely work, getting one made strong enough might be the tricky part I’d of thought

@pascalrieder9216 3 года назад

that idea is sick man, u are a genius!

@quirkyMakes 3 года назад

I know you don't know me but I have a few suggestions you might want to think about. Don't use a ring at all. I know why rings are used. This is just a thought but if you calculate your piston and cylinder expansion from cold to high temp you can design your piston to have enough room to expand. however you would need a way to preheat the engine to bring the cylinder up to temp and running expansion. If you still have that 2-stroke motor from your bicycle build you could try this with that motor. I don't have the tools or materials to do this myself other wise I would try it for you. I would love to see you make it to bonneville. Slight Edit here: I just thought of something. Have you thought about running a sleeve on your piston? It would do the job of the ring but you wouldn't need to worry about it springing out into the exhaust port.

@nhytg376tgyuu765gjmg 3 года назад

Yep, a ring higher then the ex port -problem solved 😁 Wait a minute -it might work 🤨

@DaveFromColorado 3 года назад

I'm getting excited and I can't wait to see this thing run!

@centurialinc 3 года назад

Do you have a coating for the piston? If not then the friction from the Ring on the piston may damage the piston so quickly the useful life would be to short. Having the piston ring on the piston mean all the friction goes on the walls of the cylinder which is very hard. I think a ring retainer is a possible answer. Mazda had issues with this on the rotary engine seals the apex seals to be specific. Here's my idea. Limit the amount the ring is allowed to expand. If you make a ring with a wedge shape and a piston that has a removable head. You could machine a ring groove so that it limits the piston ring from moving to far out. Use shims or lapping to adjust the amount of ring expansion. I would be happy to 3D model my idea and send it to you if you are interested. Keep going I want to see the engine run. I bet you do as well. Best Matt

@2STROKESTUFFING 3 года назад

Watch the latest vid...

@MetroTubettaja 3 года назад

Finally!! 💪 Thanks for the amazing content

@freshy2774 3 года назад

Keep the content coming love it !!!! 🤘🏼

@pedalcarguy 3 года назад

Yay, you are chooching again! Just when I thought you should eliminate the piston ring like in a Cox model engine, you said it yourself. Keep it up and stay safe. All the best from Finland! 😊 👍

@robivlahov 3 года назад

Dude , bridge the port , it will snap for no point . The heat will expand it even more , make.try it with a bridge , make it run , than you port out the bridge and try the ring and other things , we NEED to see it working

@mxrider2strokebraaap54 3 года назад

Nice update👌

@heavymetalmadman3533 3 года назад

exterior piston ring idea is really cool

@klausweber9985 3 года назад

Thats a really cool and crazy project

@scottyb069 3 года назад

That huge exhaust port is going to eat that ring in seconds, you could sleeve it and include a bridge in the port but when it heats up a narrow bridge may expand into the bore. It's a fine line the rotary engine guys have had to deal with for a long time with their bridge port conversions.

@ThatRandomMan1 3 года назад

I absolutely love your videos

@ValExperimenter 3 года назад

Having a good chamfer on the exhaust port helps, it need to be deeper than the ring protrusion to squeeze the ring back into the groove. The ring is only a sealer the timing is provided by the piston edge. I like the ring in bore idea you will need to reverse the coating, nikasil or hard anodised piston with a aluminium bore. I wrote this before seeing the end of the video. To get a good idea of what chamfer works with a conventional piston imagine taking a large diameter sanding drum held a 10 degree angle to the bore and grinding a chamfer which is deeper in the centre and tapering off to the edge. The chamfer ends up looking like the classic oval port even though the port has an almost straight top edge. The RD500 factory race prop bulletin illustrates this.

@2STROKESTUFFING 3 года назад

That sounds very much like the chamfer that was supposed to be there. Not only does it help the ring, flow is improved too👍

@jonjohnson2796 3 года назад

Dude that's effing brilliant! The area above the exhaust port (including the fixed ring) could be replaceable! You could even make the top of the exhaust port part of the replaceable "head" for quick volume changes!

@adamganjaman2275 3 года назад

Ahh it's always men in sheds the other men in sheds know what I mean I wish you as few headaches as possible been here since your first k or 2 subs crazy how much you've grown the channel respect

@wags9777 3 года назад

Glad to see the lathe being used.... as a filing vise.

@markus2151 3 года назад

Can’t wait to see the final reveal. 😁

@kasuraga 3 года назад

I was going to suggest putting a taper on the edges of the exhaust port so the rings get unseated and seated a bit smoother. Not sure how much of a taper it would need to be but if there's a decent amount it shouldn't stick Edit: i'm high and posted this like, when you were talking about removing the piston ring

@mopedmarathon 3 года назад

I agree with the guys here suggesting a supporting wall or 2 bridging the exhaust port top to bottom. They will be of a fairly small surface area though so will wear faster than the rest of the bore. Good luck dude.

@jimdale9187 3 года назад

Really like the idea of a cylinder ring, instead of the piston ring! How about if the ring ID was slightly larger than the piston. This would allow the piston to come up into the ring with a slight clearance. Then the pressure from the ports closing and piston moving is ported in behind the ring to squeeze it onto the piston. Then after combustion, the ring would be squeezed even tighter, keeping the pressure high on the power part of the stroke. Would need a pretty weak and flexible ring and enough end gap to allow inward movement. Put slight radius on the top corner of the piston to allow the ring to float and then be centered by the piston. Previous comment suggested nikosil coating of the piston. The only time that you need really good sealing rings is to contain the high pressure of combustion. Moderate seal would probably be adequate for the compression part of the stroke.

@mrpresidentm1 3 года назад

Awesome!

@CrazyTony65 3 года назад

Stop and measure frequently while honing to look for taper in the bore, you should be pumping a little more aggressively with about 1/4 -1/3 of the hone leaving each end of the hole, put a radius around the exhaust port at the cylinder, this is what rotary guys do when porting and dropping the back half of the leading side seal into intake port.

@gruberstein 3 года назад

If you use a cylinder ring the piston should probably get the hard coating not the cylinder

@wags9777 3 года назад

Captured rings. Nice!

@richardlewis1363 3 года назад

I was a 2stroke nut in the day and love the smell of Castrol😍! Anyway ..on the subject of experiments and porting arrangements I didn't have the facilities... I agree your cylinder needs a good nicrasil coating on it 👍. As for the 100% exhaust port duration/width/area ???? Good idea in theory but too much stress on piston ring 😤... How about ... Reconfiguration of the porting ??? Hence.. why not repoint the direction of the transfer angles ?? Also have them entering the cylinder in a cross flow? ..so they are forced to meet in the middle of the piston and combustion?? Front transfers keep as normal ... Back transfers facing the front so flow surely flow must meet up in the middle under load ?? Also introduce a 2nd exhaust port at the back of the cylinder 💪. Therefore keeping both exhaust ports at reasonable width 😁??

@Dayne32nd 3 года назад

A little paint roller works great to apply silicone to the halves of the cases evenly.

@ferrumignis 3 года назад

One time use only I guess? Cant see you'd ever clean RTV out of a paint roller. One of the hard rubber rollers (e.g. the type used for bluing surfaces prior to scraping) might be a better choice.

@sylentxtinction2097 3 года назад

RC engines have run ringless pistons for years. Break-in is CRUCIAL though... and so is extremely tight tolerances. Also, a ringless piston design has a very short duty cycle. The cylinder integrated ring design you're proposing has a significant problem... piston galling. It COULD work, if you had a ceramic coated or NIKASIL coated piston... but it wouldn't be worth the reciprocating mass added by the coating... or the risk of it flaking off the expanding piston. In short, cylinder walls are designed to ensure shear forces. Piston skirts are not.

@2STROKESTUFFING 3 года назад

Ringless tapered pistons don't scale up too well I've heard, but I'm tempted to try. Coating the piston would add an insignificant amount of mass, we're talking 50-100micron thickness.

@Sumtingg 3 года назад

Mark my words it will spit out the piston ring first start.

@2STROKESTUFFING 3 года назад

Damn right I won't listen.

@2STROKESTUFFING 3 года назад

It probably will, and we'll learn something, do some adjustments, try again, then repeat. Remember we're experiment here, trying to do something different, improve. That's the point.

@fukhue8226 3 года назад

Things change with heat. After the ring expands an already bad problem will get worse.

@javymcdeez3958 3 года назад

@@fukhue8226 I got 3 bridges to sell you in Brook land!

@danielturner4152 3 года назад

@@2STROKESTUFFING Keep up the great work and ideas. Last I checked none of these chumps have been invited to Bonneville. I think the potential of a huge exhaust port combined with a tuned expansion chamber could work, the returning pressure waves could play a role in keeping the Piston in its happy place. The resonance is the key.

@patrickbaechler 3 года назад

Exactly according to my moto, more is more :)) I look forward to every other interesting video

@mrbidule33 3 года назад

A simple solution would have been to create 2 bars on the exhaust port to guide the segment. You still have to be able to solder them, but you will have to redo your nickasyl. In your current configuration, you will have too much friction on the exhaust side and it will not work, your segment will tear the nikasyl in a few minutes. ;-)

@matthewf1979 3 года назад

Of course the exhaust ports need to be ramped and you need a solid thicker ring. Good luck, can’t wait to see her on the dyno!

@2STROKESTUFFING 3 года назад

Exactly.

@lengaming1651 3 года назад

Ooh i can't wait...

@bigcheese781 3 года назад

Maybe you thought about it already, but with piston moving relative to ring, I would presume you'd need some harder surface on the piston (not just bare alu). Sleve the piston itself or coating perhaps?

@brianhaygood183 3 года назад

Did you hire a cameraman or cinematographer? Your whole channel looks very artistic now. I'm here for the content, but it doesn't hurt that it looks so pleasant. Good job.

@2STROKESTUFFING 3 года назад

Thanks. No cinematographer, just me and an old Nikon D5100

@gazvlogs7459 3 года назад

That cylinder needs a good solid sleeve!

@jons6125 3 года назад

Yeah thought while watching you needed a chafer but now you’ve had another interesting idea you have to try the “cylinder ring” sometime!

@Fix-N-Ride 3 года назад

It's a great idea, but I guess you would have to coat the piston because of the wear on the ring, and how about heat transfer? Still liking the idea!

@gpzephyr 3 года назад

The ring idea sounds interesting. It should work with Marks piston design but you'll have to get it plated otherwise it would wear very quickly. I'd work very carefully with piston to bore clearances maybe by heating the entire piston and cylinder assembly in the oven so its at max operating temperature and then checking clearance.

@georgechoquette5735 3 года назад

Genius solution! A possible further improvement to your cylinder wall embedded ring idea, is to design the ring with a slope on the top part of the ring. Look up the Keystone Ring design. My 1972 Suzuki 185 had rings like that. The slope provides additional cylinder wall force because the top combustion pressure vector is not only downwards but also partially lateral. Search for Keystone Ring and you will understand. In the case of your new design, of course, the ring is embedded in the cylinder wall and the keystone design slope will cause the extra force to be applied to the piston. The cylinder embedded ring design also has the advantage of substantial piston weight reduction (not just by the lack of rings) but thinner piston walls as well. Cooling of the ring may be an issue.

@delcat8168 3 года назад

Yes, that's what I thought... presumably there is some reason for not having a narrow vertical bridge splitting the port in two?

@nhytg376tgyuu765gjmg 3 года назад

It is a long lived myth that keystone rings press substantially more against the cylinder wall. Ordinary piston rings also press against the wall with the combustion pressure (the pressure gets behind the ring). The reason for keystone ring design is to minimise carbon build up.

@propstrikerc5551 3 года назад

Have you looked into removing the piston ring completely like in small model engines? They use ABC / abn coatings and slightly tapered bores to achieve low friction and good compression seals. There would be nothing left to snag. If not, bridges in the exh port are a small compromise in power for a massive gain in reliability.

@ilveverythingdaft 3 года назад

How about putting a bit to n the cast like a few mm support in the middle off exhaust pot to keep the piston ring in and stop it from piping out in the port and still have good flow

@Ozsmallbore 3 года назад

Unfortunately a small bridge in the exhaust port will get extremely hot and bulge in towards the piston causing it to seize.

@2strokejunkie686 3 года назад

@@Ozsmallbore if properly clearanced for amount of expansion and it shouldn't, many large exhaust ports run very narrow bridges without any issues

@tritiumrecords717 3 года назад

Also I have drilled 2 holes directly inline with the bridge in the piston skirt thus lubricating under crankcase pressure

@julian9579 3 года назад

a tip for piston ring grinding: find something with the same diameter as the cylinder or even use an old one 😄 then just put some valve grinding compound in it an put it over the piston in the lathe 😄

@watahyahknow 3 года назад

wonder if it would help to make the ring like a coil so the ends overlap 100 percent and goes around the bore twice , that would make the gap non existent it and you would need a LOT less tension in the spring as it divides the tension across the two passes probably be a lot harder to make and install though youre idea of having the ring sit in the cilinder is interesting as in i never seen it done that way but i think that with the speed the piston moves past the ring it ill just keeps it sitting against the back of the ring groove , i think at 15000 rpm or more the spring tension isnt enough to make the ring return to its original shape could allso be that once the ring reaches its thermal expansion and the ends butt together the ring has the perfect size for the piston to pass through without friction one last thing i think might be a problem is that if the burncycle goes past the ring in the cilinder the burning mixture could move down btween the piston and the bore and ignite the mixture in the crankcase you might still need to add a ring lower on the piston to prevent that from happening you might need to coat the piston with nickasil too as you reversed the up and down friction from the cilinder to the piston maibe if you find a fiber or plastic that can handle the heat and doesnt expand / contract you can make the ring out of one piece might allso help of you make the ring a round edge instead of adding a chamfer

@CrazyTony65 3 года назад

The rotary guys also use a scissor action to get the seal back up on the plate, exhaust ports are slightly rounded on the top to help the apex seal back on the housing after passing the exhaust port, it doesn't drop but a flat top edge eats apex seals.

@nhytg376tgyuu765gjmg 3 года назад

His ex port is rounded.

@BIGWIGGLE223 3 года назад

Your idea for putting the piston ring in the sleeve instead of on the piston is flipping brilliant!!! I'm sure there are gonna be a lot of nay sayers just bc ppl don't like change and even more don't understand how advancement works. Bc even if it doesn't work, it could lead to something that does. The only issue I can forsee is making sure you find the right kind of steel with the right heat treat and temper to hold up to the spring like forces it'll have to survive at high RPMs. There's a correct steel for this application, you've just gotta find out what that is and hope it'll keep it's shape when it's subjected to the heat, friction and the loads it'll be under when the piston forces it open. Actually, I wonder if a split ring with a spring washer (I know there's a proper name for this kind of spring, but it's eluding me at this moment) between that and the sleeve would be the better way to go. You would have to find or make a spring that would push the 2 ring halves together, but spread just far enough that it still seals the chamber at combustion. May have to have 2 rings if there's enough room. This way the ring doesn't have a load point that causes metal fatigue and ultimately turns into a split ring anyway. Yeah..... I think that that sounds like a better way of doing it, but I am not an engineer nor am I a metallurgist. I'm just some guy sitting in his chair, eating Cheetos and watching you do all of the hard work. I can't wait till you get all the little kinks worked out. This is gonna be f'ing epic!!! I've been watching since about the 3rd video in this series and you are so close man!!!! Love watching you work through the issues. Your drive and passion for this is why I keep coming back. Your desire to see this through is inspiring. Anyone else would've quit after the first failed casting. But not you. You gave failure the 🖕🏼 and kept on fucking that chicken. It'd be awesome to sit in the shop with you and bounce solutions back and forth. Do you have a need for an old, loud mouthed, bearded, fat American that'll drink all your whiskey, bring a buncha axes for random tree chopping and occasionally do some work?? If so, I'm just who you're looking for. Hahahah!! Keep up the amazing job and thanks for bringing us all along while you work through and solve all the issues that you've ran into along the way!!!! It's been a helluva ride!!!

@adamc1713 3 года назад

I think the cylinder ring idea is brilliant. I wonder if you might put a very slight taper at the top of the piston to help it lead into the ring as it passes by. And of course nikasil plate the piston now that it is the wear surface instead of the cylinder wall.

@AmirPomen 3 года назад

i liked the idea of static piston ring!

@edvinjohansson9625 3 года назад

I just had an idea, but it might be stupid. 100% exhaust port is what everyone wants, but why not make two exhaust ports on either side of the cylinder, each 50% of the bore. There would be no short circuit either, since both sides have exhaust ports, and there is pleny of space for transfers on the front and back sides of the cylinder. Although, two exhaust ports might cause some problems when the gasses have to go in two opposite directions, and the pipes would maybe just shoot all the gas from one exhaust port to the other, instead of shooting it to the back of the cylinder, like in a conventional setup. Not sure if I make any sense, and if this would actually make any power, but just had the idea and wanted to share.

@heavymetalmadman3533 3 года назад

bumpy roads are the only one's to travel :)

@2STROKESTUFFING 3 года назад

Agreed!

@Patricks_Projects 3 года назад

Ring is still gonna snag, due to piston rocks in the bore slightly in tdc and btdc, you gotta make the ring so restricted that it won´t seal anymore. And the 'other way' around would probably give you heat problems as a lot of heat from the piston crown is drawn through the ring into the cylinder.

@davidosborne5057 3 года назад

What about using the Mazda Rx7 rotory apex seal material?? Cut in the shape of a piston ring? Just a thought

@kepamurray1845 3 года назад

I like the stationary ring idea. What about a plain aluminium bore and the plating on the piston? Might make your life easier.

@williamshoemaker3025 3 года назад

cylinder ring very interesting really would like to know how that would work out thinking out of the box or piston

@kevinchamberlain7928 3 года назад

Nice to see the old glass of EP90 that you drink, again! 👍

@GabsSystemsbuster 3 года назад

The idea of the angled piston ring is worth a try but odds are once at operating temp it will snag

@stretchedbmx 3 года назад

There’s a company in Ohio that makes ringless ceramic pistons. Could be a good option

@2STROKESTUFFING 3 года назад

Interesting!

@Cannibeasty 3 года назад

What's the company name? Thanks!

@stretchedbmx 3 года назад

www.niamareisser.com/automotive/ Here’s the link. You could try emailing them about getting a custom piston made. I want to get some made for my puchs at some point

@broo_shs 3 года назад

ive never saw at someone moves a piston with out oiled it and never stop hone in cylinder and use a oil when you hone but i hope you can made that engine to roor like a beast

@2STROKESTUFFING 3 года назад

There's oil both on the hone and piston.

@jediknight1294 3 года назад

Awesome, getting the engine started and running before worrying about the gb makes sense trouble shoot one piece at a time. Not fully assembling may be a mistake as you may do things to 'f8x' issues your full build has already done and then find out your 'fixed' engine really isn't happy in its full form

@henriquepereira5563 3 года назад

I greetings from Portugal, have you thought of a w shaped exhaust port. You can go very wide without ring catching

@pabitrikalita3940 3 года назад

Imagine this in a go kart, it would be awesome

@gruberstein 3 года назад

Maybe make the ring have no tension until it gets close to the top of the stroke. Drill small holes on top of the piston to behind the ring so the compression only forces it outwards when near top of the stroke.

@2STROKESTUFFING 3 года назад

Good old "ringland porting" 👍

@gruberstein 3 года назад

@@2STROKESTUFFING I knew it was called that 30 years ago, but my memory isn't what it used to be

@dritalian007 3 года назад

Might need to redesign your casting so there is a bridge in the exhaust port, doing this will stop the piston ring from poping out into the exhaust port and you won't have to modify the piston ring besides gaping the ring

@pets4489 3 года назад

You could 3d print half thin swirls on each side of the bore. Precise printing could make the entire section mesh. No ring expansion losses.

@2STROKESTUFFING 3 года назад

Interesting, please elaborate!

@grapsorz 3 года назад

to experiment do as the old school ppl did.. no ring and taper the cylinder (cone cylinder). that is how the Husquerna engines was developed ;) talked to one of the engine designers. that was on the "old days" tho.

@CZ350tuner 3 года назад

Quite a few good 2 stroke ideas were dropped, due to manufacturing cost on production engines. For instance twin ports were last used on a production 2 stroke motorcycle in 1972. Dropped due to the extra exhaust pipework adding manufacturing costs & a few kilos of additional weight. A twin port 2 stroke allows for a larger combined exhaust port diameter venting into two independent exhaust systems, with can be synchronised in resonance or have different resonances. With modern electronics a twin port 2 stroke could have one exhaust pipes system active & switched in above a certain rev range.

@EnlightenedSavage 3 года назад

@ 0:46 with the cylinder moving like that it will make it oval and tapered. Gotta make sure it is as close to inline as possible at all times

@jamierichardson971 3 года назад

What if you beveled the exaust port to allow ring to slip over the edge and back at a softer transition

@KentRoads 3 года назад

Yay no loud noise to shit me up :D

@nathanchalecki4842 3 года назад

the aluminum piston wont like being dragged across the cylinder ring. its not the same as having a stationary ring in the piston.

@DevinderAthwal306 3 года назад

That what I thought at first but then I thought what about nikasil coating the piston?

@jaydenbrockington4525 3 года назад

Devinder Athwal very interesting, but then also remember that it will be impacting the piston each revolution, causing extra stress on the coating

@DevinderAthwal306 3 года назад

@@jaydenbrockington4525 yes very true, the corner of the piston would be a high impact and stressed area. Maybe have a thicker coating in that area, but not sure how it would cope?

@jediknight1294 3 года назад

What about running a harder piston than the ring I mean longevity of the engine isnt a huge concern given the point if the project 6 runs before a rebuild of the top end or a piston replacement isnt outside of the normal for top speed stuff.

@DevinderAthwal306 3 года назад

@@jediknight1294 harder piston will probably be heavier so more stress on the connecting rod.

@DoctorDagobert 3 года назад

A possible issue if the "cylinder ring" idea might be, that the piston, while downstroking, wont produce enough positive pressure in the crankcase to force the gas trough the transfer-ports. Just my thought, i have no experience with this.

@kylebrown5957 3 года назад

If you look at the little nitro rc car engines some are made without rings just a tapered bore maybe he should look into that but I’m not sure if it’ll scale up and work with a significantly larger engine and those engines aren’t known for reliability but he’s not making it for that anyway

@2STROKESTUFFING 3 года назад

No worries, I really on pulses from the pipe for mixture transfer.

@0mpm0 3 года назад

Besides of the awesome engine build, I'm curious what is your choise of drink when your work with the project? And also bridge on the exhaust would help with the problem alot, bore it bigger and sleeve it and if possible weld some support on the bridge behind the sleeve (that it's not attached to the sleeve) it helps alot in future if it breaks, you can re bore it size bigger and have a new run.

@johngonzalez3076 3 года назад

Is there any way you can cast a divider in the exhaust port to keep the ring compressed and open up the port horizontaly to make up for the divider being cast in?

@Hyprmtr 3 года назад

Maybe you could build it without the piston ring? Similar to the Aluminum Brass Chrome(ABC) model airplane engines. Tolerances would have to be very precision though.

@2STROKESTUFFING 3 года назад

I've wanted to try. I've heard it doesn't scale up very well, low efficiency.

@Hyprmtr 3 года назад

@@2STROKESTUFFING Most powerful 2 stroke and efficiency shouldn't be as one. Haha

@daleolson3506 3 года назад

You have to have ultra high rpms to get any efficiency or power due to compression going past piston. I was racing snowmobiles and damaged a cylinder. Had a 1/4 inch groove 1/4 inch deep thru the bore up and down. I had to put it back together and run it. I was surprised I finished 3 rd out of 12 or so starters. Could only tell out of the hole. Otherwise it ran ok. And this was stiff competition.

@denniskern91 3 года назад

I had the same idea and wondered too why this principle isn't upscaled.

@TheDr1Acula 3 года назад

@@Hyprmtr efficiency and power are connected, you want your power at the crank and not just as heat in your radiator. But yeah, that could work if you make a tapered sleeve that has bigger clearances towards BDC and gets tighter towards TDC. That way you'll have more compression at TDC, without the added friction throughout the entire cycle.