I want to see an engine that has cylinders 1 and 3 petrol, and cylinders 2 and 4 diesel... make some strange hybrid engine thing

you are correct in your thinking, the problem is the crankcase. i am a 2-stroke motorcycle mechanic and i think the problem is that your engine doesn't have transfer ports to get the mixture from the crankcase to the cylinder. each con rod needs its own sealed chamber with transfer tunnels and ports. hope this gives you something to work with and look forward to seeing it run, keep up the great work and ideas.

Exhaust is a major key factor to a 2 stroke. It needs an expansion chamber, this helps keep the air/fuel inside the cylinder.

Please do not give up on this. I really want to see you guys. Sorry I really wanna have you guys see this one through. I would love to watch it. Thank you.

In my opinion - shoulda attempted the Detroit Diesel 2-cycle approach. Keep the intake ports as is - but use the original exhaust valves rather than making ports. This way you don't need to keep the individual cylinders sealed off in the bottom end. However, this approach *does* require a supercharger/blower that can actively push fresh air into the cylinder(s). It'll also require long-skirted pistons that cover the intake ports when piston is @ TDC, else the blower will pressurize the crankcase. Detroits actually have piston rings at the bottom of the skirt, to prevent this. It's worth mentioning that cam speed will need to be 1:1 with crank speed. Nice try, though.

Without crankcase pressure forcing fuel + air mix into the cyls, you'll need to add a super charger like they do on the old Detroit Diesels. Two strokes don't "suck" like 4 stroke on the intake stroke, they need a form of forced induction via crankcase pressure or an external blower. You'll get this to run!

Is this the single most ambitious channel on KZfaq? From creating straight 6s out of a 4cylinder, converting a gas to diesel, now a two stroke? This is insane.

You guys are straight up engineers, or mad scientists. I love it either way!!

Been watching this channel almost since it started and I'm always amazed at the sheer hard work that's put in to every project, even when it was just Vlad in a tiny lock-up garage

Keep the factory head, with the valves, but change the timing gear and cam lobes to run a two stroke timing diagram. That is, make it a valved two stroke.

A few suggestions: 1. In a multi-cylinder 2-stroke crankshaft have a labyrinth seal between the main bearings to stop the gases flowing between the individual crankcase chambers. 2. You are correct you need a tight seal between chambers, you will probably need to use thicker plate and then machine the top face and make a gasket. 3. The crankshaft on a 2-stroke has large cylindrical discs that take up a lot of the volume of the crankcase chamber that helps create a higher induction vacuum. 4. The crankcases need to be as tight to the cylindrical crank disks to reduce the volume of the crankcase, as in point 3. 5. Efficient scavenging relies on back pressure in the exhaust, 4 x expansion chambers would be best, but any sort of exhaust would help. 6. Mount the carburettors as close to the intake ports as possible, maybe 4 individual carburettors from a 4 cylinder motorcycle.

This was brilliant, i'm really looking forward to part 2 of this. I know you'll get it running eventually.

You should have done it like Detroit diesel did in their 2 stroke line. Use a blower to feed air and in this case, air and fuel. You would need a longer piston skirt to block off the intake ports while piston is moving up to prevent fuel/air from entering crankcase.

I love this channel no click bait no bs just awesome experiments with talented guys!

I really want to see you guys pull this one off anything with a two stroke is so cool to me!

Great engineering and fabrication - you guys go to enormous lengths to do these projects. Respect!

The resonance created in the exhaust of a two-stroke engine is one of the most important parts of its operation, because it does not have valves to maintain compression.

Should have built it as a uniflow 2 stroke, use a blower to push the mixture into the cylinders via the inlet ports and cut and rotate the camshaft lobes so both valves act as the exhaust with the cam driven at 1:1 with the crankshaft

It's getting there! watching your previous videos gives me the confidence that you will figure this out. It sounds great when it fires... can't wait to see you guys getting it to run on it's own power. If anyone can do it, You can!

I love this project! Please keep at it and make that 2 stroke Lada engine work! All the best from Canada...

Even though it didn't really run, you did get it to fire. I think this was one of your best endeavors! It takes quite a bit of knowledge and creativity to accomplish this!

So things to look into! I would definitely reference alot of outboard engines for design ideas. There are many 2-8 cylinder engines displacing up to 4 liters (Mercury Optimax's or Johnson/Evinrude Etec's and older are good examples). It's definitely possible. Suggestions from a guy who's been around these 2 strokes for years. Maybe put a dome to the pistons in a way to help with Scavenging inside the combustion chamber. Look into "Surface fire" spark plugs (NGK BUHW) then you can get the piston really close to the spark plug and help bump up your compression. You are loosing alot of volume Due to the ports so every little bit counts. Another thing: The backs of these 2 stroke crank cases are practically open and covered in Reed Valves. Often times having a small carburetor per cylinder. Maybe try fitting another carb and more Reed valves. Remember you have to have enough fuel and air charge to fill the bottom of an entire crankcase. While also loosing alot of potential fuel charge from Fuel contacting surfaces to be lubricated. Also the crank case definitely needs to be sealed between the two. Any sharing of charge will completely disrupt the charge coming into the crankcase, and being pushed into the combustion chamber. Ignition timing is another huge factor. These engines often idle at 0° BTDC and advance with the throttle up to as much 32°BTDC. Now this one id say 18° area WOT and 0 or even a little After TDC. Like 2 or 3°. If I can think of any other suggestions, I'll definitely update this and hopefully it helps! We Definitely need to see this running.

I absolutely love what you're doing here; it's no easy feat. You can do it fellas, and I can't wait to watch (and hear) it run when you do 👍 Fantastic content 👌

Each cylinder needs its own separate chamber in the crank case for this to work, otherwise the fuel/air mix isn’t going to be forced into the chamber with a shared case. each cylinder also needs a separate transfer port that connects the chamber with the crank case. You can reference the Kawasaki H2 triple to see how multi cylinder 2 strokes are setup

you could try reading the crank pressure using a compression tester. You def need good seals between the inner and outer crank case areas, and if you can LOWER the empty volume in the crankcase that will also help with getting it running; the closer your crankcase is in volume to your piston volume, the better vacuum it'll pull on the intake, and transfer more strongly.

You guys are awesome. Cheers from the states. I really want an old Lada to putt around in. Reliable tanks

Great idea. Don't give up. You are so close. I can't wait for the next episode.

This has te be my favorite video. This should be done to all 4 stroke engines 😋

I built a Honda d15a 2 stroke here in nz many years ago, it used a roots supercharger and the crankcase was left standard. I drilled and taped transfer and exhaust ports to accept treaded pipe. It made very good power for a 1500 and sounded amazing!

One thing i absolutely love about engines and cars is that it doesnt matter what country your from. We all love them the same and its commen in every country. Great job guys 👍

Well, I have not even watched the episode yet, but you guys never fail to amaze me so let’s do it here we go

I'm exited to see this project come to fruition

Two stroke piston rings are often pinned in place to keep them from rotating until the ends catch in the ports, in addition to the other problems

You could try to make it a 2 cylinder two stroke. Use the cylinders in pairs so that for instance cylinder one acts as the crankcase for cylinder two and the same thing between 3&4. Two combusting cylinders and two pumping cylinders. This way you can also keep to stock lubrication system running.

Man, this is absolutely crazy that they attempted it in this way, it’s amazing

I think you are right, it might need 4 or 2 separate crankcases. Don't give up, please. 😀

ive always wanted to see this be done, now its done! it even looks like a 2 stroke like a wartburg 353 or trabant

I love this kind of high-tech shade tree mechanics. I am waiting for the robot cantina to release his new vid tomorrow and might have found my new favorite channel here. Thanks for the video guys. Keep up the great work and God bless.

That is something I’m really looking forward to see! Congratulations

I think you should shorten the distance between the carburetor and intake flaps. You definitely need a exhaust. The sealing in the chambers ia also important,but it might work without doing it. Keep up the good work! Great videos!

cut and weld the crankshaft so all pistons are TDC and firing at the same time. Then you won't have to isolate the crankshaft chambers. Got my first cox .049 2 stroke running 40 years ago they are a wonderful thing. You guys rule!

Im baffled at the off the shelf "coil on plug" conversation 😂

Thanks for reading my suggestion last week 💪

Im very sure that the timing is wrong! Check the timing!

Use a 1 blower for all cylinders and normal oiling for the crank if possible

You need seals between each bottom end crank chamber and the chambers themselves are quite large which isn't ideal. The ratio between air under and over the piston must not exceed equilibrium or it won't be able to create enough flow to run for more than a few seconds - until its revving to the moon at least. The reed valves will help with that which is why it tried harder after they were fitted but the bottom end still needs to be sealed between cylinders if you want it to work. The under piston sealing and pressures are critical. Without them its not going to run well if at all. However..... You made an engine a while back which had all the pistons moving on the same plane. If you used that then sealing between the cylinders wouldn't matter because it would act as one large engine.

You lads have the patience of a saint, 2t engines are a head duck when they go wrong, let alone trying to convert a 4T. Excellent viewing material. Convert each cylinder to its own cylinder and have the firing time at the same time. You will get a balanced problem. You are chasing your tail with this 1 lads

You need to mix 2 stroke oil with the fuel so it lubricates and seals the cylinders. Also the ignition timing must be adjusted to fire at the correct time which is at a different point of piston travel with the 2 stroke. 50:1 ratio of oil to gasoline, and make sure to use 2 stroke oil specifically. Hope that helps!

With a 2 stroke 2 inhale ports and 1 exhaust port. You need also the back pressure from the exchaust to work properly. And a separate are intake will also help. I'm sorry for my bad English because I'm not native speaking / writing in English. Wish you good luck with this project and thanks for all what you already created 😁👍

You guys have the coolest things! Keep it up!

I have to admit when you said "Let's see what comes out of this", the first word that popped into my head was "shrapnel". Good luck getting that to work!

Don’t two strokes- need finely tuned exhausts to scavenge ?

Paint a car 🚗with ballpoint pen ink

Connecting the carb to the chamber on the manifold inlet port and running exactly 98 octain mixed with gear oil always works.

Just putting it out there: many people in the comments didn't notice that these guys DID infact include transfer ports from the crankcase chambers into each cylinder intake

maybe 1 carburater per cylinder

I really hope they keep working on this, I find it extremely interesting. Also, Doesn't it need an exhaust expansion chamber for proper function?

Mechanic here, with lots of experience with 2 strokes including diesel 2 strokes. You need to introduce forced induction to your engine somehow in order to get the gases moving and allow this to run, you've inspired me don't stop

Thank yall for all y'all's hard work for everything y'all do for our viewing pleasure KZfaq should be paying y'all way more money

It's mind blowing what you guys pull off with basic machines

The carter is very large, they have to shrink it so that the piston compresses the mixture better to make it reach the cylinder with more speed

This has got to be one of the best youtube channels

I absolutely Love that you have gone to the effort to put ports into a four stroke block!!! Yes but as others have said similar; the intake ports go UNDER the piston!,,, Then additional transfer duct & ports from crankcase to 'above-piston'!! I Love that you make such elaborate modifications!, I think your separate crankcase departments will be OK! You will need to extend the piston skirt (bottom sleeve) down longer, for it to cover the new intake/ carburettor port, untill piston travel about 15mm before top of stroke (but will the longer pistons hit the crank!?)

Not just a 2-stroke, a two stroke flathead with electronic ignition. What a Frankenstein's monster.

Same engine twice the ignition cycles. You don't need a smaller motorcycle carb, you need a bigger carb. You have spark and timing, but you don't have proper compression. Intake and exhaust have reed valves that allow one way travel. Intake into the cylinder excuse out. Also, if i remember correctly from my dirt bike days, the rings are on the bottom of the piston and the rings don't go past the reed valves. Two stroke motorcycle engines use the crankcase as pump for air fuel oil mixture out of carb and into cylinder. I figured you would increase the tooth count of the cam to match 1:1 rotation with crank, weld the intake valves or convert to exhaust, double timing, get it to run with a creative intake addition to push the exhaust out as the piston rises to tdc. I am equal parts surprised and impressed that you completely reinvented the wheel with this one. Good luck with this one, i am rooting for ya.

You can machine the intake and exhaust ports on a Vertical Mill and use the power feed to get them to have all the same height and that might help.

This channel is insanely good !

No way! So excited to watch!

Primary crank case pressure needs to be high by having a tight fitting oil pan and separate from the other cylinders.each rod journal should have its own main journal

Port timing is critical. You need an adjustable plate that you can move up and down until you find the sweet spot. Also, and expansion chamber exhaust is needed for EACH cylinder. This helps pull the mixture through the cylinders.

2 smoke singles draw air fuel into a sealed pressurized crank case, sends it up to the combustion chamber and burps it out of the exhaust wit a tuned expansion chamber pipe. You gents are headed in the right direction..👍

Things you do with them ladas is borderline genius..

This is good lerning wish to see moreof theworking details in the videos so its easy to follow step by step 🤠

The crank is set as 2 up and 2 down. If it is set more like a sequential crank so that each piston comes up each quarter turn, maybe it work fire better.

I feel like the 3 intake tubes to 4 cylinders has something to do with it. The middle 2 feed off 1 tube which want to fire but 1 & 4 are on their own large port. If cylinder 1 & 2 was on one intake tube and 3 & 4 on a separate intake tube that it would effectively equal out and have the proper air/fuel mixture since one would be on exhaust stroke and the other on intake stroke. I cant wait to see the next video on this!

You should use Power valve System in exhaust outlet ports and also after Expansion Chamber separate for each Cylinder. Requires and four carburetors with ratio cubic centimeters to millimeters of the each carburetor in mm. and to perfect the result you need flanges and seals for compression in the crankshaft chambers

Like the Detroit diesel, you may greatly benefit from a positive airflow intake instead of a negative one to pull fuel and air in. Also, treat it like a V8. Twice the amount of air and fuel is needed compared to a 4-stroke since it’s firing every rotation instead of every other rotation, but you also get twice the power strokes too for the same sized engine.

According to that piston size, the intake ports and exhaust ports are narrow. If you enlarge them it will work. Normally crankcase pressure is also need. But this will do the job.

I recall a French chap building a V twin Mobylette with a shared crankcase. After a lot of effort he made it deliver about 1.1x the power of a single engine 😀 (Like these guys, he only did it for larks)

try the 2 stroke system with valves and ports like a Detroit diesel, it does not use the bottom end for induction, it uses a blower to force air in.

I do love what you are doing, with video, good/bad/ugly but honest,,I admire your effort.

the reed valves go right on the cylinder intake ports off of the cylinders spaces only enough for the valve to function, flow paths of fuel need to be corrected so that nothing pools inside of the intake runners but flows directly into the valves, bit to think there also needs to be a longer exhaust system for the reason being that trying to start the motor without the exhaust causes air to flow in thru the exhaust so the exhaust needs to be longer so that there is a natural formation of static pressure that resists the tendency to pull air from the exhaust port apposed to the reed valve.

Don't know what to suggest. But I do know they will overcome any obstacle. Never under mind the power of commenters and Garage 54. Good luck. Peace.

Very cool. In the early 2000s some American guys converted an air cooled VW motor to 2 stroke. Instead of sealing the bottom end it was more like a Detroit diesel I think, it relied on a roots blower to run. There was a video of it making a pass on the drag strip on streetfire but unfortunately that is lost to time

As a car vehicle technician from degree and a dirt bike mechanic as my job in free from school time i can say that the whole idea and execution is great, except one teeny tiny detail. Crankcase should be divided to 4 compartments, and every of them should be sealed. However you would need to cut cranksaft and make it press fit together. Also you could modify big end and drill holes for oil and crossing lines for lubrication. I'd love to see a lada with correct expansion chambers and tuned well so it has a really nice power band. Edit: The problem why it isn't working is the crankcase. Because it isn't sealed it does not make high enough pressure to move air/fuel mixture from carb to cylinder, because of 2 stroke compression being much lower than 4 stroke and it just doesn't get enough air and fuel. You can bypass it actually by putting a electric 12v turbo charger between intake and carburetor or a ton of work with crankshaft and crankcase. By the way you could grind very wide holes in counter weights and weld a piece of sheet to lower the weight of crank but keep the volume the same which will maintain good pressure. If you want to pull it off it will take a looong time and it will be many ups with much more downs before you get it to run

In my opinion it's that you have to have exhaust restriction make good compression with a 2 stroke. That's why they have funny shaped exhaust, to create a resonant wave that pushes fuel and pressure back toward the cylinder

You'll need a compressor and a valve for exaust to make it work properly, cause in 2 strokes the mix gaz/air is compressed by the down engine, and then injected into cylinders at he GOOD time...

What you need to do is make up another block and this time leave the crankcase alone, leave it full of oil as it usually is. Then fit a compressor (crankshaft driven supercharger) to the inlet to force the air and fuel into the cylinders instead of using crankcase pressure like you have done here. Also the inlet ports need to be angled upwards pointing towards the sparkplug and opening at about 1/2 way through the exhaust port opening. Good luck.i love your experiments.

Top mechanics and a joy to watch

Very entertaining video - and great job on the videography - I was willing that engine to start!

id say the exhaust ports should be a bit higher than the intake ports so they open sooner. if theyre across eachother like this the expansion forces into intake as well as exhaust meaning nothing will enter the block until its empty

hey u guys have a thumbs up from me this was fun i do not know enough about 2 strokes to give advice. dont give up on it you are close it looks lke very enjoyable video.

I can't wait to see part 2. Спасибо

Vlad, you are my hero.

I've worked with 2 stroke engines for over 2 years now and rebuilt a couple engines. You need to have the intake port lower than the exhaust port for it to create good pressure. Also try a real 2 stroke carburator. Pwk. Phbg etc and give every cylinder their own carburator. This is to give the right amount of fuel for every cylinder to fire correctly. As it is it distributes the fuel unevenly causing it not to run.

I feel like dedicated carbs to the cylinder pairs would help. If the cylinder head warped while welding, over and under pressure could occur between cylinders. Maybe try a thicker plate, drill a large hole into the plate half thru and then drill/tap for the spark plug. When it did fire, it definitely sounded like it had too much gas or too little air. Combining exhausts for the cylinder pairs may help. The reed valves you tried were a good call, I have no idea what the crank case seal from bay to bay is like and may also cause under or over pressure issues. Timing is everything with 2 strokes.

I come for the jank. Garage 54 always delivers.

Each cylinder needs to be sealed from each other in the crankcase so when the piston is travelling down it creates pressure underneath the piston in the crankcase which then needs to push the air up and around into the cylinder above the piston, this type of crankcase seal in a marine application is called a Labrynth seal, the port that allows the pressurised crankcase pressure to travel into the cylinder is called a transfer port.

I would love to see this engine finished. Try multiple motorcycle carburators, one for each cylinder. And expansion chamber exhaust, also one for each cylinder. Even if you added a yz 250 expansion chamber for each cylinder that would be more helpful than running straight from the block.

My suggestion is to build a 2 stroke gasoline based off of the principles of the Detroit diesel 2 strokes. Although they rely on a supercharger, crankcase segregation is not necessary. And you can retain your oil pan and pump. A cylinder head with valves are necessary for the exhaust, and a 1 to 1 ratio camshaft.