The Most Powerful Two Stroke Ever - Cool things on the horizon!

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Please watch the rest of this series, it's important for continuity, lot's of stuff going on here, mega wide exhaust port, weird piston ring, two piece piston, twin intakes, valveless induction, nitromethanol injection ++
Looking like the metal 3D printed cylinder might become a reality after all! Troubleshooting sealing issues, making a sensible decision for once.
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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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Опубликовано:

22 сен 2020

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Комментарии : 518

@2STROKESTUFFING 3 года назад

Thanks for all the comments! As with all my videos lately this one too was uploaded just as I went to work, replying later today!

@scheffers1 3 года назад

So, drinking before work... I understand with your job.

@Idiot1477 3 года назад

Sooner or later I feel like this will be your work if you want it to!!!

@MarkDaleADV 3 года назад

Make sure you have another stiff drink before you take on the ultimate challenge of the comments, after that Bonneville will be easy!

@fabiotiburzi 3 года назад

Throw out that cylinder, coating is chipping out. You did it too thin. In no time it will wear out compleatly

@paninisinabox 3 года назад

Can you bore and sleeve it?

@TerryGilsenan 3 года назад

Those holes might also act as a grinder on the ring

@tacit9873 3 года назад

Didn't know the ring was gay

@ianbuilds7712 3 года назад

@@tacit9873 😂😂... I wouldn't judge it either way...

@christophemedard9004 3 года назад

Those holes are good. Oil retainers

@tacit9873 3 года назад

@@christophemedard9004 they are not, that's what honing is for. Those holes are counterproductive

@trevcannon 3 года назад

@@tacit9873 you must be an idiot.. you only hone a 2 stroke cylinder when it's been replated to piston and ring spec, you do not hone a cylinder to get rid of bore deflects and out of spec.. *face palm*

@ossanyberg 3 года назад

I vote for the sleeve. Play with the plating later. One problem at the time.

@MeanOldBastardBikerBob 3 года назад

I worked in plating 23 years,,that's porosity in the cylinder metal it with take a long time to build up the nickel to fill the holes, should be using a 115 soak tank at 175 degrees, clean clean clean then acid tanks, needs a lot more rinse tanks,, air should be bubbling in tanks,, anode should be installed before any parts start to be cleaned/plated and centered, titanium with titanium mesh welded to it will throw the nickel into the cylinders...try adding x peices to the anode all the way down, or use abigger anode,, I love saying that word when i was young I called them analeds to my supervisor he kept asking me what did u call them lmao .. ,, good copper contacts, minimize time parts are out of the tanks ...more rinse tank for each tank of chemicals,, garden hose to rinse after rinse tank,, you can contaminate tanks with run out from parts ,, attach a test pcs of the same metal and after plating cutting it and pick or peel the plating to check for addhesion,, sleeve all the way********* can I pre order one for a z 50- build ,,CHEERS ****PEACE .👍🍁🏍

@natesyring8981 3 года назад

Love the upload schedule! Cant get enough of this channel

@uuu-jt6jy 3 года назад

True

@danieleforcella7930 3 года назад

Love how he says WE won't have to worry about porosity and WE won't have to worry about playing as if we all are contributing to this project

@2STROKESTUFFING 3 года назад

You are!

@christopherknee5756 3 года назад

I certainly feel like this is a global project. Alex is doing all the stuff (and more) that I have always wanted to do with two strokes. I am willing to contribute as much as I can and by the sounds of it, there are thousands of people world wide that feel that way too.

@kiaelfenheimret4397 3 года назад

I’ve had a very talented bike mechanic tell me if you can feel the imperfections on the cylinder with your finger nail then it will effect compression. Keep up the great work!

@Trenislife 3 года назад

That's basic ASF. Doesn't take a very talented bike mechanic to know that...

@TestECull 3 года назад

That grey residue is gonna be normal in an engine with such low runtime on it. You're still in break-in...hell you've barely even begun break-in...it's gonna do that for a fair while until everything beds in. The residue is a red herring.

@johannesmuller1288 3 года назад

Im also into 2strike Tuning and some people say if the components are good you don’t Need a break in just idle it for 1 mins and then full send

@eetumalvikko8327 3 года назад

@@johannesmuller1288 when bore is Nicasil plated you should run it to operating temperature and take 10-50km trip without stops and run in variable load, after that cool it down completely to outside temperature and after that it should be okay to go full send when next time used.

@leegarrett5469 3 года назад

@Eddie Hitler this is a land speed record engine I don't think it needs to last longer than a few runs haha

@kimisson322 3 года назад

@@eetumalvikko8327 kiitos tiedosta

@scottyjones27 3 года назад

Looks like the sides of the piston is rubbing the bore also? If piston is rocking that much inside of the bore would not be optimal performance

@spurgear4 3 года назад

An old friend of mine used to cut piston rings from peices of cast iron pipe with his lathe. If you wanted to go grassroots you could cut a sleeve out of a chunk of cast and press it in

@e-z.g4188 3 года назад

I would send one cylinder out for plating and compere with your cylinder for wear tests, keep up the amazing work really enjoying your progress, you look like you have got your mojo back take care stay safe mate

@lesmansom7817 3 года назад

Can you pressurise the coolant side (When the o rings turn up) and see if it holds pressure? That should eliminate or prove the worm hole theory. Love your channel mate, 😎

@MetroidChild 3 года назад

The problem comes when the engine is running, the explosions would likely break the glue on the o ring which would cause leaking, it'd probably work fine in a static pressure test setting.

@lesmansom7817 3 года назад

MetroidChild I’m talking about a static leak test. Gotta start somewhere.

@MetroidChild 3 года назад

@@lesmansom7817 What I'm saying is that a static leak test won't help since the glued o-ring will hold up to those kinds of loads (since people use it for custom computer water blocks).

@Hermiwalle 3 года назад

key word being (when the proper O ring turns up) m8.

@lesmansom7817 3 года назад

Hydraulic cylinder o rings handle upwards of 3000 psi. I doubt if a pissy little 50 cc would get that high.

@Swanny383 3 года назад

Liner is probably the best way to go, Is there any off the shelf liners that could match up close to your bore/stroke, and then window/port it out yourself with a template ? < I suspect with a steel liner it would also increase the thermal efficiency too

@CarrierPigeon42 3 года назад

However, it will increase the likelihood of seizures. Especially when cold. The piston will expand at a far greater rate than the steel bore. this is why modern 2-strokes now all employ a nikasil type of coating rather than a sleeved bore.

@Swanny383 3 года назад

@@CarrierPigeon42 yeah , I am not a 2 stroke expert perhaps some coatings or extra tolerances would need to be figured into the design, just thinking modern 4 strokes can turn some pretty high RPM and they use aluminum pistons too , just ideas

@onecookieboy 3 года назад

I am in the cylinder liner camp on this one, it would eliminate so many unknowns and makes it easier to keep moving ahead.

@Nevertrustalawyer 3 года назад

Just one problem, he doesn’t “do” things the “easy” way.

@JbFixCorleone 3 года назад

Nevertrustalawyer I like.. But would be statisfied with plating after testing..

@ramrod3159 3 года назад

Look up a company called LA Sleeves. Ive went to them before when making weird engine combos for racing purposes and they have never let me down. Just gave them the specs I needed and it popped up in a box on my porch in a few weeks.

@garygordon5081 3 года назад

In my experience.... If you plan on porting later, do not plate. The raising of the port roof will create a edge of nikasil, that will peel off. Experiment with a cast iron liner. You will probably have to buy a "blank" sleeve. No ports, based on your bore, and cut in your ports. By the way DO NOT raise the transfers any more than necessary to square them up. To much transfer opening will kill the top end power. Changes the blow down aspect. The liners are cast iron, because it is porous and retains some lubrication. You can't use a chrome piston ring on a nikasil liner either, never will break-in. Dyno tech research, and Erlenbach Racing Tom Turner. 2 stroke gurus.

@dsimila1 3 года назад

I think you could make a cylinder sleeve in your workshop. Maybe.

@mat6179 3 года назад

I think a liner would be the best option and use a template to match the ports

@alishihade4751 3 года назад

Also you can calculate the theoretical pressure for the engine to insure your work (knowing that you must calculate the pressure according to the volume to at the top dead center and according to the volume just before the exhaust port ),( p=Vmax/Vmin)

@Tunerfreak99 3 года назад

Honestly you could try to sleeve it for testing purposes

@dednside5229 3 года назад

Nikasil and or piston skirt coatings

@ekim000 3 года назад

Fascinating stuff. I learn something new in literally every video. Congratulations on your progress so far.

@floriankleinert6538 3 года назад

if the imperfections in the cilinder are big enough or placed in in spots were they are building little bypass channels around the pistonring theyre most likely cause a low compression rate . A Piston with more than one piston Ring might help here ( but i think thats not a solution for such a high reving cilinder). I think you should let it bore oversize an get a liner to avoid further problems that might waiting in the casting itself until you can get a porosity free cilinder 3D printed.

@madmadworld9651 3 года назад

Good to see you are back in the groove, great stuff

@MrJameslewis530 3 года назад

SUPER GLUE AND BAKING SODA TRICK IS BY FAR THE BEST SUGGESTION. IVE DONE IT . AND IT WORKED BETTER THAN I COULD EVER IMAGINE. YOU CAN DRILL IT YOU CAN TAP IT. I BROKE MY EXHAUST OFF MY BIKE MOTOR. THE CORNER WAS BROKE OFF THE JUG CASTING, I THOUGHT THE MOTOR WAS RUINED. NOPE, SUPER GLUE AND BAKING SODA . NEVER HAD A PROBLEM AGAIN.👁👁👍🏼

@nimahuMC 3 года назад

Thanks for the daily uploads, so nice to come home after a long day and see a new video up.

@retired-pipefitter 3 года назад

Here in the US we use nickel boron on gun parts, it’s hard as hell and never needs to be oiled to be slippery. Great stuff.

@krestpatu4240 3 года назад

I wanna see this man build a rotary

@nfdr0kk3rz 3 года назад

@paul beenis The rotary valve SPX isn't exactly a wankel engine

@crautoguy8384 3 года назад

Totally inspired by your work and diligence in your work mastering a craft on one small machine some world's fastest Indian stuff finding a project that doesn't take a million dollars and following a path to greatness an learning i wish there were more kindergarten teachers like you

@troywee4774 3 года назад

thanks for the update.

@mrfurious93 3 года назад

@2STROKE STUFFING- I think your lack of compression may be due to the ring not being able to fully expand on the exhaust port side. Consider making the ring retaining pin hole a slot. That way it can expand, but not enough to get caught in the exhaust port. Just like atkinson's "L" cross-section ring. Also, as others have said don't forget to oil the cylinder to reduce wear and maybe even improve compression!

@paulmcgrath3159 3 года назад

I’m loving all these new videos, thanks man! I also loved the axe and woodwork ones too, anything that you do is interesting!

@jeremykonkle4571 3 года назад

Wasn't sure I liked your camera style at 1st but its really grown on me. Can't wait to see this engine really rock!!

@guidosamson682 3 года назад

Sometimes the small holes can fuction al lubrication pockets. An old Zundapp came wirh markings like someone hamered a starpoint screwdriver in the whole wall

@cobyburrow9339 3 года назад

I enjoy these videos and learning some about 2 stroke performance mods.

@curtisharrison4837 3 года назад

The sleeve takes care of this, it's the best way.

@l7ragoon 3 года назад

I think those wholes in the cylinder walls, If your port them oval shaped very very little, maybe that can give more flow outwards and less wear on the moving parts that are moving up wards and downwards.

@alltheboost5363 3 года назад

I really think having it machine and a cylinder made to drop in as a sleeve... would be the best way. Best of luck can't wait to see the next video

@simonrechner9395 3 года назад

Normally only oil on a clean rag will fully float out all the debris. Alot of people wash a rebored liner with dish soap...does not work. Only oil on a clean rag will clean the bore or piston properly.

@mandela557 3 года назад

Sonic soldering iron to fill the holes, hone the bore, and re-Nickle coating over the top of the solder. The sonic iron allows binding of dissimilar metals

@sailingsvandorina9758 3 года назад

Protolabs are really good mate. I used them to print some extremely challenging components for the nuclear industry. They were really helpful and know their stuff. I was surprised by how affordable metal 3d printing is now. Surface finish was outstanding. Love the vids👍

@sennguru 3 года назад

@2strokestuffing I really think you should send the cylinder out! What you are doing is not fabrication r&d, it is 2 stroke research. It is not worth risking to Work with those nasty chemicals, when you can simply have a good-enough job done in town for relatively cheap. When I was in medical research my boss kept telling me that you have to keep your eyes on the ball even if you want to do every little thing yourself. I now think he was right ;)

@kaldiengineering1118 3 года назад

It would be awesome to see what can you achieve with the harder "DIY" nicasil coating! Fastest and easiest would be a liner, but you know "easy is not worth anything"! Keep it up, just do what that noone did before :D

@simon.ad84 3 года назад

Great work great channel ❤👍👍👍👍

@michaelratliff7775 3 года назад

I enjoy your channel. My 2cents Cylinder liners could indeed help you I think, I'm an old marine technician and this idea or question came up at tech school when discussing the cost of power head replacements. The instructor said it was a good idea and could definitely work and that it would impact the entire industry! We mentioned it to our company boss but never invested any more thought into it because we were just lowly paid techs. Now I wish we had pursued the idea! 😷

@casada70 3 года назад

needs to be machined for a steel sleeve! that would solve all the hardening issues and is replaceable!

@BIGSMOKE-bl2lq 3 года назад

My thoughts exactly

@iodinmonoxide6286 3 года назад

Yes that's correct, more easier and maybe cheaper

@ferrumignis 3 года назад

Cast iron is the normal material for cylinder liners, I doubt steel would be suitable. It was a long standing goal to not use a liner as it reduces cooling, but I guess if it means at least a working prototype it would be great.

@robsmith3940 3 года назад

I think steel liners is pretty common in high performance aviation engines

@douglaslila9825 3 года назад

The grey material could be the piston as it is the softest part of the rotating assembly.

@Idiot1477 3 года назад

Not sure what trouble it would be but I build custom chainsaws and Hyway or Taiwan has started using a formula they call Titanickel, it supposed to be titanium infused nikasil.....they claim it's much strong and they offer a 1 year warranty with their cylinders now. May be something to look into🤷🏻‍♂️. Either way. Love the channel sir!!!

@Baldys_projects 3 года назад

Nice stuff!

@thenewBH 3 года назад

The black gray stuff is from your too-coarse hone job for a hard plated cylinder, as I posted in the last video. The harder coating will help the bore itself but only exacerbate your skirt and ring wear issues. An iron sleeve, however, would allow for easier rebuilding, not be so picky on the hone job, allow use of a dirt simple moly ring, and retain oil naturally in the porous structure of the iron itself. I think the main reason so many 2 strokes have hard plated cylinders is because they run in such filthy environments typically. Gonna be your decision. For what it's worth I've had 2 of my Harley flathead engines run very hard at bonneville and el mirage with no appreciable cylinder or ring wear with a plain junk iron ring and no air filter.

@larryegilman1 3 года назад

A dremmel tool with felt wheel can be used to remove excess CA. Friction does the work. I enjoy and appreciate the work and thought that goes into your videos, no matter when you upload them

@2STROKESTUFFING 3 года назад

Thanks for the tip!

@raymondo162 3 года назад

the thing is: the whole garage-workshop thing is the enjoyment of learning about a process, setting stuff up, trying and retrying............... rather than drawing and speccing stuff (casting etc) for a company to make, which will probably speed up your progress to bonneville - but you'll spend a lot of time waiting for the parcel guy !! i cast a drive weight for a clock i've been working on for a while - i have seven wooden patterns, a home-made casting box, a big bag of proper casting greensand, a bag of casting plaster etc etc...... i spent hours at it !! i could have got someone to make it for me, but i would have missed a lot of fun. in essence: is bonneville top of the list ??

@2STROKESTUFFING 3 года назад

Well said!

@fictional25m 3 года назад

mechanics can sometimes get stuck on one thing sometimes compression actually slows things down..remember you need velocity to be stronger than the compression in order to continue the rotation try and start a push mower with no blade and you will see the same effect everything has to be taken into account when blueprinting/designing if compression is higher than the flywheel velocity it wont start the flywheel needs enough momentum in order to over come the compression and since your using cdi/magneto it has to over come that and bearing friction and any other frictions even though minor friction seams like very little in a combined way its a lot i dont know the math equation to figure out the amount of weight needed

@pdr5926 3 года назад

I have found that that hose type adapter for the compression gauge leaks above certain pressure through the o'ring that is supposed to seal against the spark plug hole. Try with the straight pipe adapter, the one that you have to hold against the spark plug hole. The compression value on your engine is likely to show a higher figure.

@dwhxyz 3 года назад

As Mark Atkinson found out plating is just a time consuming pain. A good old steel liner is much more forgiving and can be quickly cleaned up after a seizure with a hone or rebore unlike chipped/damaged plating. Keep it simple especially when doing development work. I personally would have started with a bridged exhaust port and standard ring setup for initial testing and then removed the bridge(s) and gone fancy ring for phase two. Tweak and perfect one variable at a time imo will be bring success quicker than trying everything all in one go.

@christopherknee5756 3 года назад

My feelings exactly. This is the perfect opportunity to kill two birds with one stone. What I would do is drop a cast iron (or other suitable metal) liner in. Port the liner to the casting ports but add two narrow bridges for the exhaust port. This will allow you to run a dead-standard piston so you can get it running, test the compression, test the other features and so on. Then when that is working, and you have received another Mark Atkinson piston, you can easily remove the exhaust bridges and see what difference running with no bridge brings.

@AmirPomen 3 года назад

Liner! The port design you can just trace from your current cylinder and pre-port the line to match before pressing them in

@AmirPomen 3 года назад

Plus.. liner is quicker to replace on demand.. compared to plating/coating which render the cylinder is useless if damaged

@mwhelan53 3 года назад

Is it possible that running nickel on nickel (bore and ring) is actuall galling the cylinder plating?

@marxkartredge 3 года назад

And when it gets hot the friction coefficient could go up and cause seizure, dissimilar metals are harder to weld together.

@brentbolivar9283 3 года назад

Patience bro, you will get there. I believe this design will work when you get the bugs worked out. Stay positive.

@joelan93mtfworkshop89 3 года назад

awesome channel! also get to watch a very switched on fella build a sick 2t haha 🤙💪

@boltonky 3 года назад

Great videos and always interesting, i like the idea of a liner/sleeve it does remove some variables and i am no engineer but if you look at engine design there is a reason lots of old stuff had liners and not just cause of tollerences gave you ability to change bore sizes/increase water jacket or oil jackets. Anyway keep up the hard work and hope one day to get back into my prototyping

@Xsidon 3 года назад

and yeah i vote for the liner. it's a pretty failsave solution plus replacement isn't as hard as replating.

@pekkamalinen7257 3 года назад

That grey stuff is normal, you have a pretty harsh hone in the bore, so it will take some time for the ring to seat properly. Just run it more and the compression rises when the hone marks go away and the ring then seats properly. Next time use finer stones for the hone, so it takes less time to run it in.

@hunter9372 3 года назад

The grey residue is off the piston.you are springing the engine without any lubrication “No Fuel”.

@falco447 3 года назад

I also don't get why I have never seen him putting any Oil in the cylinder anymore.

@maxpower700 3 года назад

@@falco447 that would give false compression readings, and with a dissasembly every start/attempt... 🤔

@willtrautman6243 3 года назад

@@falco447 He said in a community post that he lubes everything up

@AuMechanic 3 года назад

Those holes in the bore would explain why you have such a low comp reading yet the engine runs because it running speed there is less time for the comp to leak down via the small holes. This is where we use a wet compression test to compare to the dry test (old school method used to determine if low comp is rings or valves), squirt oil in the bore and turn it over for a second or 2 to clear most of it then put the gauge in and crank it, the oil will help seal up bad rings for the test, or in this case will reduce the comp leaking through those holes so you can get a relative compression reading to dry to confirm the theory.

@bostonbikebits6539 3 года назад

If it were me I would be going the liner route. Even if it took longer.

@ovenking4481 3 года назад

Perhaps this man wants to do everything himself but casting and then platting your own barrel is so massively difficult. Maybe he should send it off to get it plated or even see it one of the superkart engine manufacturers could help him. Honda would have had 300 people working on this! This guy is a legend!

@shawnbottom4769 3 года назад

I must’ve missed something but I thought he’s got a lathe. If that’s so, he has everything needed to put an iron liner in at home.

@2STROKESTUFFING 3 года назад

I'm not confident in my lathe skills yet, but hey, I can practice on the failed castings!

@alexanderjohannesson5867 3 года назад

Looking forward to se the powerband 😎🤟🤟

@Hershel_777 3 года назад

You need to make a proper 2 stroke exhaust to make a good power band

@scottyjones27 3 года назад

Some times it's best to just start from scratch all over again

@JbFixCorleone 3 года назад

Nice to know that you stayed in contact with cobra. What about the plan hone in the zincate bath(I think)? You mentioned that in the plating series.. Greetings from Germany

@2STROKESTUFFING 3 года назад

👍 Honing in zincate wasn't necessary, the plating sticks well with just a dip.

@jdsstegman 3 года назад

I want to throw this out there..... I live in Minnesota In the USA and I use a company that does all the plating on all the snowmobile and dirtbikes i build for customers. They do an amazing job. If you would like, I would be willing to pay for them to plate them for you. As it is with all these plated machines and the fact that all pistons that are labeled "stock" are not the same size. They will finish the plating to match the piston. I have never had a cold seizure, or anything like that with their work! Of course you would have to ship it internationally, but that can be done.

@2STROKESTUFFING 3 года назад

Thanks for the offer! I'm getting a liner made now.

@jdsstegman 3 года назад

@@2STROKESTUFFING Well, as you know heat transfer is better with plating. But my offer will always stand. So if you go that route, just let me know!! In the USA all we get is the cheap 50cc 2 stokes for the street but i own almost every 60,70,and 80's 2 stokes made. I love them all! Keep up the good work!

@juhomaki-petaja 3 года назад

I bet the problem is combination of few things. One is cylinder porosity, another is piston. In compression, pressure is leaking above pistonring, thru piston structure

@Fluckor666 3 года назад

I could do the boring but I''m in western Canada. Pretty sure one of your compatriots would be able to help with that. Keep up the good work. Cheers

@christophemedard9004 3 года назад

fill holes with super glue^^^you're my hero!!! ^^ try aluminium epoxy, last longer for sure!

@terryj257 3 года назад

I have a suggestion for you, too help with the starting carb. If you could make a blower box around the carb and feed it compressed air. I'll let you figure out how.

@jamesswetland5019 3 года назад

You could use JB Weld to fill those pits and it would hold for as long as the motor last. They use it in race cars on the cylinder walls. Take my word use JB Weld and the pits on the inside of your cylinder.

@daleglastonbury96 3 года назад

Certainly innovative under pressure,!

@rickybanzai2199 3 года назад

Cast iron sleeves were used on a lot of high performance japanese 2 stroke: suzuki gamma 500, rd 350 and 500... For sure, you take out a problem. Nickel plating ok, but after you get the engine running.

@crautoguy8384 3 года назад

So just to say thank you you're very inspiring and I love your journey and thank you for sharing. I have been building car engine's for 22 years i dabble in matching i am not a machinist i assembly engine's that i spec out i don't know much about nickel plating but it appears to me you are plating to bore size you should go thicker and then have a machine shop bore and hone to size or get a adjustable stone hone ad more material than hone to size

@All-Sgood 3 года назад

If there is any chance of worm holes I would be concerned of fractures later down the track after its seen some proper use

@marksparks59 3 года назад

Plating is unlikely to fully eliminate pin holes, sounds like a liner is a better option to me. Anyway, love the effort to get a little 2smoke whizzing

@LPMFO 3 года назад

Go with the sleeve

@pjjms 3 года назад

Super glue may not work in a running engine but Devcon will. I've used it several time in ports and combustion chambers to test different shapes with good results. It will handle many test runs.

@yelyab1 3 года назад

How about a slightly pressurized smoke test. I’m concerned about the size of the smoke molecules. Normally very fine leak detection is done with a small atom, helium. You would seal up the block and the pull a vacuum with a cheap-o Harbor Freight vacuum pump. Measure the vacuum with a manometer see through tubing and water should work) back fill the block with helium from your welder or go to the kids party store and they sell small bottles for balloons. Put in helium to a few psi, maybe 3 to 5. Wait and watch. If it’s really holly it should slip out in a few seconds or minutes. If the pores don’t go through the casting it could take all night. I never tried this but the approach is standard in the auto labs I’ve been in working on leaks on other types of products.

@pauloconnor7951 3 года назад

This suggestion won't necessarily handle worm holes from combustion outward. However ; Rolls Royce pour an additive into the coolant system that coats it; to seal imperfections and gaskets etc. I've forgotten the name; research could turn it up. May help from that side of things.

@hakonjordbrk3976 3 года назад

Digger dette!

@limitlessbuilds 3 года назад

Ooh! Another one!

@layne9566 3 года назад

Have you considered making the cylinder and piston a pinch type compression engine, such as small RC nitro engines?

@singlejingle_ka 3 года назад

I haven’t clicked so fast on a notification in my life

@singlejingle_ka 3 года назад

Josh Frank sure did, the amount of knowledge this guy has is insane. I learn something new every time I watch his videos!

@ryanharriss7950 3 года назад

Liner sounds like a really good idea, plus you can be a bit creative with the ports to optimise (depends how thick the liner is). Best of luck with it. PS, a bit of oil in cylinder to see potential compression?

@white67black28 3 года назад

I was wondering if he had oil in the cylinder as well.

@davidsimo2385 3 года назад

The reason your getting inconsistent compression is because your turning over the engine for too long without any fuel and lubricant if you hook up your carburettor with fuel running to the engine you will get a true and consistent reading with higher compression

@2STROKESTUFFING 3 года назад

Thanks, good tip! Assumed the oiled bore was enough, have to quit assuming things...

@PeterBradbury8 3 года назад

I suggest liner/sleeve the bore

@2STROKESTUFFING 3 года назад

👍 Going that route!

@MrJameslewis530 3 года назад

Thats what I was going to suggest right before you said it. The super glue and baking soda trick. My most popular video. You can drill it. You can tap it. Sand it. And the baking soda causes the super glue dry in seconds.👍🏼👁👁👍🏼👁👁🔥🔥

@98976h 3 года назад

make sleeve and forget porosity & plating

@colinbagshaw1796 3 года назад

Austenitic cast iron liner needed

@pyrofalcon146 3 года назад

I'm sure budget constraints exist, but maybe it would be better to do professional plating/sleeve to eliminate variables in tuning and compression and also speed up the timeline towards tuning. Great to see it running, and awesome camera work!

@joequixotic3039 3 года назад

I think a liner makes sense but because of your exhaust port, I think it needs to be in two pieces. If you are going to do that, I think it might make sense to build the top of the cylinder in to the head and make the bottom load in from beneath and captured between the crank case and the water jacket/cylinder. Just make the sleeves so they can only be installed in one position and can be bored and honed in place for alignment so everything stays concentric. It's a radical change that might have to wait for your next version but it kind of makes sense to me. Also, about SLS, I don't think you will get a useable surface finish, there isn't much SLS can do that a good casting can't do and probably cheaper too. I see SLS as something to try when you hit a road block and have exhausted all reasonable alternatives, not a technique to apply randomly. Every time I watch your videos, I think about your ring too. If I have a good idea for that I'll share too. One thought I have is that your port configuration might make it possible to run a smaller bore and longer stroke to get 50ccs and that might let your intake port be closer to a circle than the present elipse and that might let you jam more air and fuel in. Good luck with whatever you try.

@francosporto3c 3 года назад

The bare aluminium could be caused by vibration in your piston ring after passing the edge of your exhaust port ... but that little bridge was rejected early in the design By the way were any forced intake means also voluntarily rejected at the start of this project ? ... it would be another challenge

@upsidedowndog1256 3 года назад

I am loving the progress you have made lately. I am not sure if you remember my comment quite a while back about using a pressure carburetor to deal with the fuel frothing in the floatbowl, but you said those are expensive. I didn't know what was a available for your needs but looking at a Kawasaki Jetski carb on my bench looks exactly like what I meant. Not sure how methanol or nitro would affect it but they are everywhere used for next to nothing. I would donate mine if you think it may be useful. They have no floatbowl. Mine is pretty rough, may not be worth the shipping.

@2STROKESTUFFING 3 года назад

Thanks! If you're referring to diaphragm carbs that's exactly what I'm going to use for the primary intake, got several. Thanks for the offer tho!

@Ro-Bucks 3 года назад

I was thinking the "easy is not worth anything" shirt was perfect to me but then I seen the "say NO to camshafts", now I'm conflicted.

@Do-sp9bj 3 года назад

I see you use a 2 part piston with just 1 ring. The black smudge could possibly be exhaust fumes that crawl and stick to the piston. It would be better to use a piston with 2 or 3 rings to prevent that and should offer you more compression. I'm looking forward to the next steps in your project.