Odlicna stvar, eeee sad na to staviti turbinu :D

Svaka cast ja bi mu stavio Hladnjak jer ima vise od 1 cilindra i sigurno ce se pregrijati

Fun project! An elastomeric shaft coupler might make life a little easier on the engines as it dampens the impulses a bit.

Svaka cast! Mislim da je mogao jedan prekidac da gasi oba motora, samo ih povezi zajedno.

Now we're talking, perfect job man, keep going ❤

Surprisingly great sound it makes 👍

Hope you've staggered the ignition strokes. One engine needs to be exhausting while one is fueling or your gonna have one engine taxing the other

Masterclass! Very good bro!!! Greetings from Italy🇮🇹

I would try two carburetters instead and you need to adjust them 100% precisely. I don't know where to get it, but many many years ago I tried to adjust doubble caburators using a vaccum measuring system, on Audi 80, on the fly on a highway, we meassured the vaccum at 120km/h because they didnt work even at that speed.. In short terms we drove 120Kmh, notiched the vaccum differiencies and stopped at nexe haigway exit, adjusted, drove again.. VERY interresting how a very small difference, could give a huge result in engine performance. We adjusted the nozzels with very small round metal files. If the engines are not running at 100% precise torch, one engine will have to use power to turn the other. It's difficult to explain, but if you think about it it actually logical, IF you use a single caburetter, the distance to each cylinder must be 100% the same, polish the tubes on the inside as mush as you can, and the same goes for the exhaust system ( maybe two exhaust systems are better?) if not same lenght, one cylinder will sort of block the other cylinders outlet a little. Finally you could try to adjust the angle between them, eventually 45 degrees, and adjust the crank so it "kooks" like a Harley? just for fun :)... or buy a 400cc engine instead hahaha

When I was 14 a younger friend asked me to show him how to rebuild a small engine. So we got 2 Briggs and Stratton 3hp engines and pulled them apart. He did one, and I did the other. We did not bore them, just new piston rings, gaskets, spark plugs and cleaned everything up real nice. When done they both ran. Then I had 2 little 3hp engines that I didn't know what to do with. I had a Go-Kart, but it had a 5hp Briggs on it, so 1 puny 3hp did not interest me. Then I thought about combining them. I pulled the cranks back out and took them to school and in machine shop I threaded the outside of the pilot shaft for the recoil on one and inside the pto end on the other so the two crankshafts screwed together. I made up a common manifold and braised them together with something like Fonson or Phonson. ( I can't remember what it was, but it was not braising rod) When I got all done it worked and I really enjoyed the sound of a 2 cylinder engine on my Go-Kart. But, I got a lot of criticism for not timing the pistons. I had simply screwed the two engines together and wherever they were when it got tight was it. Some said the timing should have been so close that one coil could fire both for the most hp. Some said the two fought each other and it made far less than one by itself. Well, I had ridden my Go-Kart with a 5hp Briggs on it plenty, so I knew how much power that had, and I could dispel their criticism because my 2 engine Go-Kart had a lot more power than that single 5hp did. What do they say about proof is in the pudding? I had a lot of pudding time with my 5hp and this double engine had a lot more pudding. Also Too, I wonder: Did the engine in this video sound like an old John Deere B engine? I had a 2 cylinder engine on a two wheel walk behind tractor called a Standard Twin. BOTH PISTONS WENT UP AND DOWN AT THE SAME TIME TOGETHER. They fired alternately. It sounded perfect. I have had engineers tell me it couldn't have or it would vibrate itself apart. Well, somebody forgot to tell The Standard Engine Company of Minneapolis Minn. or just never bothered. Because they made a lot of them from the1930's to the 1950's and they didn't vibrate at all when running. John Deere I have read thought it would be too hard to balance their 2 cylinder engine if they had both pistons going up and down together at the same time firing alternately, so they did like the guy in this video. With the John Deere one piston fired at TDC while the other piston was at BDC so there were two power pulses 90°apart, then a long lag of 630°? ( something like that, do the math I may not have it right) until the first one hit again. What we hear at idle speed is the 1st one, it has to bring the engine speed back up from the long lag and pumping losses, and that makes the 2nd one inferior in sound, which is where they got the name "Johnny Popper.' Until the engine worked hard enough to have both power pulses working hard, to me, the John Deere B always sounded like it was misfiring. Hey, that was a long time ago and I'm gettin a headache from trying to remember it. ben/ michigan

How is it even possible.... Amazing.

People stop comments of criticism of his work. He busted a theory every one of us had as a child growing up. I used to think if I could connect four of these I could make a car etc.. He just made a video to show it.

The ignition switches can be integrated as single one by changing the wirings. Great job!

Wow! That is a lot of work. Thanks to your ingenuity and hard work!

The whole building-process looks really very accurate. Congrats !😊 great job, nice vid.

That's sounds lovely! Good job 👍

You should convert this to a draw through HCCI style engine, and use water injection just before the intake port where each case pulses it's own or each other's fuel pulse pumps, you may want to make sure the pumps will handle methanol or ethanol. Now you could use a butterfly as a throttle, and set it up to inject a small ethanol (vodka, 40% ethanol) boost each cycle. Homogenous charge carburetor runs better for a twin cyl than your carb, and the ethanol aka vodka injection system helps keep the engine clean, keep from overheating, and allows it to run very lean with less risk of issues, which is the main issue with HCCI carburetion. Could boost your low end torque and horse power higher, certainly will boost fuel economy.

Spark plugs with multiple electrodes doesn't make more spark, it forces the ignition coil to work harder than it should because it's trying to drive two spark 'plugs' from one coil output. You end up with either multiple weak sparks per plug, or the spark becomes unstable and ignores one electrode completely at random. Just use single plugs for a strong consistent spark. You may also want to think about timing the crankshafts so they work together, therefore each engine fires 360-degrees apart. It'll smooth out the fueling through the carburettor. That'll result in more consistent firing, less vibration from a more balanced power delivery, smoother overall torque...all of which is ultimately more reliable and lasting fun.

Thanks verymuch for mechanic engine study.. success always Mr...

The engines runs very well together!!! What is the next level.. Create an V8 engine out of single engines??? 👍

Nicely done doctor, can't wait to see what it's going into. You're an evil genius 😂.

Finally a way to max out my Harbor Freight wood chipper! Seriously, nice work.

Your dexterity is amazing.

Do a double carburetor setup with a turbo charger, that would be your best bet at making powa

absolutely awesome job.. now i have a project to do myself,,instant subscibed also . appreciate the posting. and ill go through your channel and check out other projects also . thanx again

brilliant, well done!!

Your level of craftsmanship is incredible you make me want to get out in the shed

That was very cool I liked the build I would have put electric starter on the one and then I will use a Honda Key dignition but wire the kill into both engines so you didn't have to do the stop button twice

you should put 8 in a vee configeration

You did an awesome job, you got a new subscriber here , I have to see the all videos from your channel

You are such a clever young man.

now put a turbo on it

This is amazing! Well done

It was brilliant.. bravo 👏

Cranks are designed to carry power, among other things...would there be an issues with too much power snapping the crank if the motors are too heavily loaded?

Great job for better than most people could ever think about doing

Really really cool, looking forward to seeing what such an engine will be used for 🤩👍

Having only one carburator you should use 360° as then the airflow is symetric to the two engines and therefore both engine-halves would produce the same ammount of power. At the moment you loose some power of the non-perfect airflow in the intake behind the carburator.

I watched this entire video just hoping and waiting for the point where the turbo was going to be installed but it never

Thats amazing job

Jeder Zylinder benötigt einen eigenen Vergaser, und auch einen eigenen Krümmer in gleicher Länge........😉

that is super cool! looking forward to seeing what it will power! perhaps an airplane?

Tres bon travail , bravo !

Very clever and very entertaining.

Accurate number 99 top...thumbs up 100% cool my boss...extraordinary great

Are you May be Alien??? 😂😂😂 Amazing work, great. 💪👍

That is sweet. Some of the best fab on youtube.

Great work 👍

I salute you! You, sir, are an absolute GENIUS!!! Now, you must follow the inventors rule...if one is good...two are better...if two are better...FOUR WILL KICK ASS!!! Get to it sir!

Perfect job!👋

Try the crankshaft 270 degrees apart

Very genius, senior. I like your brilliant idea

Excellent job bro 👍👍👍👍

Just going to put it out there but mounting 2 10hp motors together isn't going to push 20hp it'll probably be pushing 12-14hp at max, but Torq would be more of an advantage.

The idea is good, but how long do you think the front crankshaft will withstand twice the load under load?

È fantastico vedere i tuoi video grande Doc👍💪💪💪

love the sound

Cool projekt, well done. But can you pls turbo charge this engine

Amazing. With you skill you could make something even more incredible

Nice job 👍 your are amazing pro boss

You should use that in a go kart

Good idea 👍👍

I bought one of those carburetors for my M120X 2stroke engine on my bicycle, but the choke doesn't stay on, was your one working properly when you got it?

After all of that put 2 turbo on ??

i would be interested in seing this with the GX200 electric start conversion fitted to see if it would be able to turn over the two engines, nice work...

you should totally build a double wide mini bike

Where do you learn your machining skills? I would kill have equipment like that, but it's way out of my price range. And Im young/broke. Repect to the machinist out there.

Very cool, your very talented 🔧

We also manufactured general-purpose engines for 2-wheeled bikes and 4-wheeled vehicles, such as GX200cc ENGINES.

Can you add a turbo to this engine? Will it work?

Nice work.Have the same engine at home.Very interesting to me.

Twin turbo 😊

Begitu banyak yang dipertaruhkan saat dua mesin dijadikan satu, tapi anda berhasil melakukannya, luar biasa👍👍🔥🔥

Needs Turbo!!!

2 switch kill 😮. Better convert to 1 switch on off power

Good job 🎉

Why not buy a 20 hp V twin engine .

your damm good ! nice job

mass production machine, Fascinating! video!

Un travail extraordinaire Vous êtes génie doctor Excellente modification Me5👍👍👍

Top markotop masse.. buat aku aja kwk kwk

Wow" can i get one? For my boat? ☺️😁

Is The Best My Brother Good Job Suces for you

BRILLIANT I LOVE IT.

You would get a smoother and more even firing order if you had both pistons at the top at the same time. So ones firing while the other is on the overlap.

where will you put it

Maybe you should have had both pistons at the top like my Yamaha 650 twin 🤗 makes it sound like a Triumph 😮, that is one exhaust and one compression stroke.

could've determined the position of the crankshaft by the location of the keyway.

I'm telling you : it sounds 100% like a harley davidson xDD

Nice idea 👏👏👏👏👏

Nice idea build the gear box and I'm watching you

Nice I dia❤❤❤

haha it sounds so nice

Hey, man.Where did you get that tap set

Bruto demais Slk 🔥

Just get a "Y" spark cable and get rid of the other coil, the piston that is at bottom dead centre gets just a waste spark, but you minimize the hassle with two sets of spark contacts etc...great job, the decision against the governor and for a bigger carb will pay out... 😉👍👍

❤Yes, you deserve to subscribe and publish this very wonderful video. Greetings to you from Arab Yemen

Very good thinks way made mopars. 👍 motor pars. Neat. Stronger longer camshaft.

Muy buen trabajo👍🏼 Has provado de poner los dos pistones arriba y alternar los tiempos? Felicidades👏🏻👏🏻

Brutalno extra posao svaka čast e sad to treba stavit na neki karting