The Weirdest Engine. 

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

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.

My day just got 5x better

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!

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

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

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.

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

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.

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

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

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.

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

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.

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 !

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!!

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!

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

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.

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!

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!

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.

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

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!

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.

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

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

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

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

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.

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

Lovely update, looking forward to hearing it run!

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

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 !!

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.

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...

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

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

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

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

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

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

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

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

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.

Found your channel whilst looking into nikasil coated cylinders . If you didn’t know the ford puma 1.7 engine ( reworked by Yamaha in Japan ) has nikasil on aluminium cylinders . Love the work , make a video a week even if it’s a short one . Keep the money coming in . Thanks very much .

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.

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.

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

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.

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

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.

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

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!

I (WE) Love how brave you are, and you keep going and never give up!

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.

SUCH GREAT WORK, this is passion. In really love your work, also love the way you experiment with so many different solutions.

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!!!

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.

Love your work thanks from down under

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

Yes! Drum valves! I tried mentioning them before but had no idea that was their name. I think those should work a lot better than the rotary

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

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.

Hey man! Your engine is getting cooler every time I see your videos😄

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👏

love your innovative ideas in pursuit of horsepower.

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!

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

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

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

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

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 ;)

Finnaly been checking everyday for an update

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

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

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!

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.

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

Been watching you for a while now. You are truly talented. Keep the great content coming.

Brilliant and innovative as ever, cannot wait for the next episode !

Oh my God it keeps getting more and more beautiful

Dude I look forward to your videos. Absolutely enjoy what you do and your personality.

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

Thank you for doing this amazing stuff. Tho I must say I am envious of your shop. Cheers

Good work! You make me want to get to work on something!

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.

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

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

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.

Interesting vid as always. Look forward to seeing how these valves go.

man, it just getting more and more interesting 👌👍

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!

Better than Netflix 😜👍. Cheers from Portugal Mate, keep up with the excellent work 💪

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.

Love your work and your video editing.

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.

Awesome as always. And I think your lens setup is really growing on me lol

Great progress

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!