The Weirdest Engine.

[@RotarySMP]

This is a great education on all the various valve solution of two strokes, and their disadvantages.

[@2STROKESTUFFING]

👍

[@DrSmile81]

The evolution of "just build a 4 stroke 16v".....lol

[@jasonrobertson3330]

​@@DrSmile81 that would half the power strokes

[@jasonrobertson3330]

​​@@DrSmile81 16valves I'm assuming you mean a 4cylnder , that would be very small parts and complex 50cc

[@tstricklin4808]

@@DrSmile81 🤣

[@larrybarnes3920]

I've been watching your videos for years. I love the way you can change the design of an engine so fundamentally and it works. Of all the channels I'm subscribed to, your new videos are the ones I most impatiently await.

[@2STROKESTUFFING]

Thanks man!

[@davidemantovi6678]

Agree!! The same!! Good job Alex

[@jaspervanwijk2685]

@@jaratt85 and thats because it is a prototype.

[@Eduardo_Espinoza]

It doesn't need to work for long, it just has to complete its task

[@tstricklin4808]

@@jaratt85 that's why it's called R.N.D.= RESEARCH AND DEVELOPMENT

[@bradley3549]

Never thought I'd see the day where I saw a 2-stroke with more moving parts than a 4-stroke. But we're getting there. :) Love it!

[@ThePaulv12]

Detroit Diesel 2 strokes are like that.

[@bradley3549]

@@ThePaulv12 Yeah, ships too. I should have clarified - small displacement 2-stroke.

[@scottcummings8074]

Congratulations! You have made muffler bearings real! I have wanted to build a 4 stroke with valves like this for years! Never thought about the exhaust valve being the pipe though. I would love to see you build a high revving short stroke 50 cc 4 stroke with a valve train like this down the road.

[@1crazypj]

Muffler bearings have always been real, Kawasaki actually had them listed for their bikes, although I forget which one I do remember what they were, the rubber damper on the muffler bracket. I guess they changed description eventually due to the amount of 'feedback'?

[@cozduntow]

My day just got 5x better

[@christophputz1438]

Same

[@B42-j2o]

Ye for sure 😍

[@jasonrobertson3330]

Is it only me that's been checking KZbin evry day waiting for next video? hoping it's today !

[@DoctorDagobert]

Not only you... I also always check his instagram but we did not get any updates so far. I bet it's gonna be a great new Video!

[@jasonrobertson3330]

@@DoctorDagobert nealy 3week now hopefuly it's not another 10minuit video.

[@essvyqc8371]

Really enjoyed the machining part and I can’t wait to see the next part!!! The CAD animation while the mill was working was a great idea also. Good quality content for your subscriber and it shows

[@simoncosta7111]

Agree

[@azertyytreza8947]

Amazing work as always… everyone who ever tinkered with twostroke engines or mopeds knows this is factory grade R&D

[@brammerema1547]

My compliments on your work again Alex. Consider leaving a bridge in the drum valve openings to avoid fatigue due to the acting bending moment when the exhausts are shut. Should be placed in the longitudinal direction of the drum.

[@shinedowncannel]

You mean rounded corners for the cutouts instead of 90°?

[@Dymitr_Nawrocki]

Yeah, bridge is good idea, even if there would be no immediate faliure, bending will speed up wear wich would make it leak more and also it will put more stress on belts.

[@Jmoneysmoothboy]

@@shinedowncannel No. He said leave a bridge. A bridge connects two things that are otherwise separate. Rounding corners doesn't connect two separate things. Study the drums and see if you can figure out where a bridge could be inserted in order to connect two otherwise separate things. The hint is that the bridge goes longitudinally along the drum and spans the valve opening.

[@brammerema1547]

@@shinedowncannel no however, always round corners. In this case I mean to leave a ‘horizontal’ bridge in the middle of the exhaust cut out so the drum is left with some stiffness. This should vastly increase the lifetime of the bearings as well. @ Alex, what bearings are you using for the drums, ceramic due to the heat development?

[@shinedowncannel]

@@JmoneysmoothboySorry, i was not fully awake :P

[@gabrielhoy6790]

Simply AMAZING work sir! For every brick (or sould I say aluminum) wall that gets in your way, you find an even more innovative solution on how to overcome it. Your "can-do" attitude is a breath of fresh air, and your content is like puzzle pieces to a masterpiece. Thank you for taking us on this journey.

[@bradley3549]

I was thinking back when you were machining the dimples/groves on the inside of the rotary valve housing, that perhaps a pair of needle roller thrust bearings would have solved the problem. McMaster has them up to 160mm. NOT CHEAP. But probably could have solved the issue if you had designed the dimensions around having one on the outside of the disk and one on the inside.

[@poorlydunbarvideos1472]

Love the new set-up! Your channel inspired me so much I actually started my own crazy project...a quad-bike made from carbon fiber with electric powertrain and magnesium wheels. I got the weight of a 430lbs Raptor down to 215lbs! I decided to make most of the components from scratch just like you...except that I add layers of fiber and you remove layers of metal. I did create kind of a lathe so I can modify tubing using a cordless drill! Still have a Lectron nitrous-injection carb you can have for free...by September Ill be able to ship it at my own expense if you want it. Never been installed, long story.

[@kevinpeeters1723]

Love de work and effort man! I was more of a believer in the other rotary valve. I think the problem was the inbalance of the disk at +10K rpm and a relative thin shaft. Have you considerd balancing the shaft and disk? But possible problems with your new setup: High exhaust temperatures will damage the rubber or silicone belt after some minutes of running time. Also the high temperature and normal bearings is no succes. Possible solutions: - Close the driven end of the pipe as close to the port as possible. So this side wil be much cooler. - Use ceramic bearings for this pupose. - maximal sealing between pipe and housing obtained by very small tolerances Good luck !

[@JaapGrootveld]

I think the in ballans was a factor, but exhaust gas pressure pulses are many times higher than inlet gas pressure pulses. And exhaust gases give a deposit on the surface that makes it stiff rather than lubricates. So very different from an inlet route where fresh lubricating oil precipitates on the surface. From a constructive point of view, there was nothing more that could be done about it. It is therefore a good step to switch to another system.

[@mathewreinecke2852]

To complicate things a little... you could make oval pulleys so the valve would "dwell" open, and open and close faster.

[@Mikefestiva]

Awesome video man! I always enjoy seeing the different changes you come up with along your engine build journey 🙂👍 Thanks for sharing this with us!

[@brandonterry1456]

Awwwwe yeah, can't get enough of these tiny little powerhouse engines😁

[@TheNumbers400]

The level of, brilliance, insanity, creativity, workmanship, character and video quality! This is by far my favorite channel on YT.

[@IanB22]

This is the greatest build ever - the MOST innovative, working with raw material and raw designs everytime. I am sure in the 2-stroke world this is not new stuff, but as a gasoline and car guy, I can't believe how crazy it is to work with the 2-stroke platform. Just blows my mind everytime I see this stuff. Rotary valves! like WTH!

[@viktorandersson7819]

This is so freaking cool. Keep up the good work and like you said - don't let youtube dictate your work too much. The quality of your uploads is awesome and it would be a shame to do anything less. I bet you'll gain more followers this way anyways!

[@jesperwall839]

Love this kind of prototyping! Can’t wait until next week 😂👍

[@47MasoN47]

This is the wildest engine I've ever seen. I'm so glad I found this channel.

[@timdaams4894]

Nice video! For CNCing holes it is better to use a spiral downwards motion than stepping down. I think it is called bore and then circular/spiral motion in Fusion360. Makes holes way rounder. Sounds crazy but it does.

[@2STROKESTUFFING]

Thanks for the tip!

[@bobshams7231]

You just keep getting better and better with everything. Editing is great. And as a prior CNC machinist, I loved how you added the cad/cam program to see the operation of the machine, since the coolant blocks it. Awesome work, as always!!

[@draggonhedd]

8:40 i really appreciate the editing and music sync. Nice job

[@prklish]

5:15 is also pretty satisfying. 😎

[@2STROKESTUFFING]

Thanks!

[@kob8634]

No matter how creative people are there's always one who'll come along and surprise me. The *guts and courage* to explore imagined (moving) shapes in metal form like this is intellectually titillating. Thanks a bunch. I get such a lift from this channel and I can't even begin to explain why.

[@paulabbott3601]

Great work Alex. with that long belt, you could have 3 idler / adjustment pulleys, this way some timing adjustment could be made to the rotary exhaust valves

[@aliciaellis2832]

This is going to work amazing. In the late 90s early 2000s I read about an engine that was built with both intake and exhaust rotary valve setup. the cfm flow was unreal. The engine was a chevy 4.3l V6. (I know I know 4 stroke) but flow is flow LoL Thank you so so much for all the work and hours of very happy watching.

[@toquinn9514]

I find these videos so well done and so entertaining that I am always disappointed when they're over so soon. Keep up the fantastic work!

[@FlyingScot]

Loved the Fusion360 animation insert of the tooling this time. That was a cool way to show what was happening behind the screen.

[@euclevi]

Been checking first thing in the morning every day for this vid. I was about to go to sleep but that can wait👍

[@jamesdeath3477]

Oh that's amazing! Has anyone ever done this on a production engine? I guess you won't need to worry about expansion pipes if you have exhaust valves, so that's one less thing. I was asking my self how you can add a swivel bearing to the middle of an exhaust pipe, if half is spinning and half isn't. Hope it isn't an issue.

[@rubikmonat6589]

Repco did it on a Holden 6 in Australia in the 60s. Not in production just racing / experimental.

[@hallkbrdz]

I'd like to order some exhaust bearings... Come on now, I'm serious.

[@tstricklin4808]

@@hallkbrdz 🤣

[@marvinrausch1735]

Yeah, you don’t need to worry about expansion pipes, so you won’t get serious power without Forced induktion.

[@keithpeterson6108]

@@hallkbrdz .....& a muffler belt.

[@claytonpozzer]

I have a new and interesting project, 2 strokes, 2 valves on head. when the piston is 70% on the lower position, the exhaust valve is opened, the exhaust create a moment vaccum when getting out into the pipe, when the piston is 85% on the lower position, the intake valve is open, putting the new air-gas into the combustion chamber, when the piston comes up, both valves are closed and after, the ignition... you can try it very easily, take a reguular 4t engine with chain valve control system, just put same size of valve control gears and change the position of the valve actuators axle. Make only one part, a valve control axle.

[@unbentcrayfish]

Alex, your determination and attitude are truly commendable. I hope to be as patient as you one day.

[@willjacques9573]

HUGE thumbs up for the overlay while you're CNC'ing, much clearer!

[@fiftyracer192]

When you're tapping a hole you should be able to wind it the whole way in in one go. And the swarf will evacuate as long strings out of the flute. Chip breaking (in and out winding) will break the string off each time and it will get in front of the tap inside the hole. This can cause the tap to bind up and possibly break. If you are going to do back and forward because the material is difficult to tap, wind the tap right out each time and blow the hole out.

[@benhowe2087]

Maybe try Torrington bearings on the disk valves? I am concerned about flow with the rotary valves. The flow needs to make an extreme directional change with the rotary valve. I guess if the rotary valves were large enough in diameter that may work. But side load bearings on the disk valves will be more compact and flow will be straight.

[@christophermclean5620]

Finally a use for those exhaust bearings I've been holding on to since the old apprenticeship days!!

[@dgpgarage9291]

I swear this man is a genius, find the problem, find the solution with engineering. I look forward every week to see what your up to, keep it up

[@kimfeldthusen2629]

Denna motorn är fröjd för ögonen, galna idéer som verkställs på kluriga sätt. Alltid roligt att se vad för nya grejer du hittat på!

[@bryanb7918]

Just watching the design and prototyping of this is great, it’s fun to watch how the engine evolves. Keep it up!

[@Pippy626]

I love how you show the fusion visual with the CNC machine. Your videos and editing has definitely improved over the years love your content and videos can’t wait to watch them

[@johnscustomsaws]

I have been porting 2 strokes for years and professionally at that... and i learn something every time i catch one of your videos... i like your style my man... if you ever decide to run NOS hit me up lol... thats probably the ONLY situation where i might have some valuable advice for you... i do get a kick out of these arm-chair mechanics that try to tell you that you are "doing it all wrong" lol... i aint even gonna try to tell you what to do... i just watch and enjoy!!!

[@shanepowers7566]

In the middle of the night I figured the rotating exhaust valves out. Still, moving parts to break. One of the good things about 2 stroke engines is the small number of moving parts.

[@jerrellkull5347]

You never disappoint. Keep it coming. Take care brother.

[@rasmusb2523]

Great content as always! Have you thought about what the high exhaust temps might do to the bearings? There will surely be some expansion and the grease might not like it if you run it to hot.

[@Hesako77]

If it works, it's easy to change ceramic bearings.

[@desperatelyseekingrealnews]

Your video was recommended, good thing too, Now I Gotta do a binge cos it's just become imperative that I know more about the evolution of your engine .Nice.

[@bostonbikebits6539]

This is incredible stuff, love your appproach and willingness to try just about anything. Long may it continue.

[@user-01a51]

This guy is a 2Stroke Gurú, you are awesome 🤌🏼🔥

[@pfeyusvg3744]

Like the guys buliding 2 strokes out of 4 strokes or otherwise but whith so much more engine parts thats have ever been invented or he found cobined together, a masterpice of a 2stroke👏

[@unbekannternr.1353]

Hi Sir, when i built my Kart engine from a GDR TS150 motorcycle i came upon a coaxial ignition cable whose shield is earthed to the cylinder only. A capacity is formed to hold voltage after ignition and lower the work for the coil on the next spark. BTW, very fine content!

[@andersson.l.e]

I really like your channel. It's really cool how you don't get stuck in old tracks. Just try out something new from time to time. No Fear.

[@artzi_ip]

i just love the attitude of yours ! if it doesnt work lets make it diffferent, no time to lose with bad design. you have lots to show for us all. thanks for the content !!

[@1crazypj]

There was a 'barrel valve' 'invention' made for small block Ford V-8 about 20 years ago, carbon ceramic composite bearings running without external lubrication and (stainless?) steel 'valve' bodies that's looked like a weird OHC set up.. Allowed it to rev to 10K and make over 500hp. The principle was very similar to two stroke porting with the barrel shaped valves cut away to provide transfer area.

[@kadecooper246]

At this point I have forgotten how this engine works. I need to go back and rewatch some videos

[@somenygaard]

Exactly, I’m pretty lost.

[@davidf.8497]

I'm amazed, each time I watch your videos. Can't wait to hear the engine roar!

[@pietgeursen7023]

Really loved the editing to the music. Also really liked the inlay video with the cuts the CNC was gonna make. Hanging out for the next video already...

[@rubikmonat6589]

Not quite a Crecy , but so cool. Your wideo is looking gorgeous too, nice lighting and white balance. Nice idea showing the tool path picture in picture.

[@davidprocter3578]

Good to see drum valves getting an airing of course they do come with problems of their own, will be interested to see how you get on.

[@wessel237]

the second screen with the machining shown in fusion is great!

[@ramazan0124]

this is not just science it is art, and proof of where there is will there is way. and will is a verry helpful person ;)

[@isickofit]

Loved the soundtrack/scribing sync. The valve solution is looking really promising. I can now see why lighter disc materials like Titanium may not work. You would have to create an aerofoil leading edge or something to overcome suction braking. Never seen drill valves in action and I know it's going to be beautifully filmed. Kudos.

[@KompressorPete]

Just an idea: maybe put in a thin walled pipe inside the primary exhaust pipe to be able to adjust exhaust timing better? In this way you can make the exhaust port larger or bigger and move open/closening timing. Great Music BTW!!!!! 👍👍👍🤟🤟

[@Blandy929]

You could apply this tubular valve in the same way a nitro rc engine works. The rotating tube valve is part of the crank and draws fuel into the crank case then up into the head like a normal 2 stroke. Join the tube valve on one side of the crank, the output shaft on the other, fit the super charger directly to the crank case into the tube valve and use the cylinder with the close to 100% port.

[@silvestree1]

Oh my God it keeps getting more and more beautiful

[@swicked86]

I'm still thinking a pressure vessel on the intake side, with a valve... And lowering the exhaust port under the intake port. You're seriously awesome!

[@blar2112]

My granfather was in Bultaco's engine division and those valves look very close to something they experimented with.

[@leon.690sm9]

this engine is getting more and more bizarre and i absolutely love it XD

[@R2_D3]

I love your dedication to your projects!! It's a beautiful thing to see!! Keep up the cool 2stroke work!!

[@knuddelwinzig498]

It's called circlip ring I think. You are surprising me again and again! Love your Chanel! I really like your attitude!

[@stefanmondello8220]

I now can say I've seen exhaust bearings

[@matthewf1979]

A drum valve is extremely hard to seal as is. Adding high pressure exhaust and forced induction amplifies the problem. A cylinder valve, like some radial aircraft engines, would be much better. They’re hard/near impossible to graft into an existing design though. If you keep having trouble, keep it in the back of your mind. Good luck my friend!

[@2STROKESTUFFING]

👍 I'm hoping "heavily restricted" is good enough.

[@madb132]

Agree with the sealing part. they are going to leak badly. Maybe an "O" ring on each end.

[@dutchsailor6620]

@@madb132 More of a labyrinth seal i guess, Full metal so no rubber degradation.

[@mrln247]

Might be he gets away with as this is in theory pulling much higher rpm, throwing fuel mix out too so sealed bearings might get backed up with oil.

[@Eduardo_Espinoza]

was thinking of main seals

[@ben_yeates]

I love this channel, even if you're perpetually in a build / break / rebuild cycle. Keep up the awesome work man.

[@user-tf7hf8jp7p]

Im also tuning and porting 2t engines (usually derbi engines, 70cc airsal is very good cylinder for porting btw) but this is next level, good job!

[@danieltopp7298]

I'm pretty sure NASA is missing its best engineer scientist my fav U tube chanel

[@AvoidingZombies]

Lovely update, looking forward to hearing it run!

[@seansmith6377]

You could probably add something similar to rifling to funnel air and actually create a “tornado” of air sucking out of the ends of the pipes. That way the exhaust would be able to come out of both sides by its own pressure. And not need as much of an angle in the hole, this also would help with balancing of the cam, which comes into effect at high rpms like you are trying to hit with this engine

[@andydelarue9344]

Music extra cool. Engine progressing well . I can’t wait

[@michaelmays9292]

I thought you wasn't going to take as long this time Brother . Just picking on yeah awesome videos ,and ideas

[@King-of-Rookies]

The fact that you never give up and that you keep going is realy awesome. I love your work!

[@richardsweet5068]

Drum valves must be a better option, a lot of work and redesign though. Great work!

[@rvmonkey1669]

Always impressed I always look forward to your content,Electronically controlled dump valve’s instead of a mechanical barrel valve using a crank trigger would be a sweet setup if possible

[@TheNumbers400]

Dude we miss your videos. Its been a while.

[@wynandsijben338]

Thank you for not cutting the video early! Loved the video.

[@collintheiss3945]

Alex, your engine is calling for an rotating sleeve ;-) It should give you more flow area and less problems with sealing and heat. With symmetrical design pressure would be balanced out! Such a great channel and progress!

[@sresto7943]

I didnt see that coming, "barrel's", i like a nice threaded insert too, its like one in the bank for future proof.

[@traviswilliams9455]

Hell yeah the vids come in at the best times. Keep up the great work. The videos are awesome. I learn a lot from you and that great brain of yours! Keep it up!

[@2STROKESTUFFING]

Thanks!

[@upsidedowndog1256]

Wild! Looks like a Ducati single now, only in a 2 stroke. Can't wait to see how it does!

[@sonovoxx]

I literally said this engine is now the weirdest... just a second before you said similar! Love it! Can't wait to hear it! 🏆

[@krovakxixao2606]

Good job Alex, wouldn't be better to weld the side where the belt is? I don't know how much hot the exhaust could be, just worry about melting the rubber belt and one exhaust per side could be enough. Also you can machine some insert there to redirect the exhaust in the direction away from timing belt side. Crossing fingers for your success!

[@steverepko5499]

love your innovative ideas in pursuit of horsepower.

[@HarryDaRat]

So impressive, mind boglin and super duper intresting. Im really glad about these inventions!

[@sennguru]

Hey man, I would really like to see you follow through a bit more with your projects. It feels a bit ADHD that a new way to run the engine is always started before really exploring the previous design fully. For example: how does an even lower pulley ratio affect the single rotary valve engine? How about valve timing? If the motor could move peak torque to 15000 rpm, it would make almost 40 HP. Also the PIP. I am a patreon and love your energy but IMO, the project needs more direction ATM.

[@codykahn2173]

He has messed with valve timing, and blower pulley ratio before. I think he’s just trying to find what works best before devoting all his time to one design, ex the pip engine didn’t work as well as the first version of the brute force concept and since then, the brute force engine has had so many renditions that it just keeps getting better. Eventually he’ll find what works best and make that better instead of changing it every video.

[@2t-moto-jc223]

I have ADHD and I have to say I'd stick with the same design personally 🤣 I hate changing stuff. It will work! Then when it doesn't I'd lose interest and buy something else lol

[@chuckingram5966]

Hi Victor I couldn't agree with you more. Alex doesn't mention Bonneville anymore. He has changed from taking home a new world land speed record to a KZbin career about an engine. Sad but true.

[@Peter57808]

Threaded inserts, in Aus they are called Helicoils, they are the best friend of all motorcyclists that can wield a spanner and can repair what they break.

[@jasonspittle300]

Threaded inserts are solid helicoils are a coil

[@Peter57808]

@@jasonspittle300 Well yes, sorry, just a coil that replaces the original thread.

[@CraftedChannel]

Time to improve quality of lathe. Great content. Love seeing all your tools, I enjoy the workshop content nearly as much as the 2 stroke mods.

[@popeyeman69]

Wow, your engine is really different now! Would using 2 idler pulleys, one above and one below the cyl centerline allow the "Stock" (LOL) intake blocks to be used, with that belt length? I bet that when you run it, the sound will be totally unique. Can't wait for more!

[@ardhifarhan4821]

man, it just getting more and more interesting 👌👍

[@ark-mark1]

You need to balance the rotary valve. And it could be made stronger by increasing diameter and leaving solid outer ring on the valve that vay that the exaust section in valve would not be a pease of pie but a rectangular hole. You could ad some weights on the outer ring in place of the exhaust opening and try to take some material of from the opposite side.

[@berurier.noir.]

Problems > Solutions > Other problems ..... Great job !

[@jackstewart7664]

You could maybe use popit valves and have them operated by a cam. When the cylinder goes down the fuel mix is sucked in the cylinder compresses the mix and ignites it with a spark plug. After that the it can be expelled using exhaust valves

[@pjjms]

Man you are one determined guy. Love the videos and its a great journey you are on. With a journey like this there is n need for a destination.

[@TheGalifrey]

Have you thought of trying a 4 stroke head with all exhaust valves? Worked for many 2 stroke diesels.

[@adrianjackway5138]

My guess would be ,valve train weight and loads cost power to drive especially with 50 cc capacity not to mention rev limitations.