Supercharged 50cc Two Stroke BREAKTHROUGH! 

ohhh how right you are, engineers all about the world following this adventure, all for 50cc!! personally I think a turbo is needed to reduce the parasitic loss

I’m guilty! Lol i don’t know how i stumble on this channel but i did and i never stopped watching lol 😂

@@marcwire9332 turbo with a boost capacitor to keep boost on demand.

@@marcwire9332 Turbos are not suited for two-strokes. You need the more predictable boost across the RPM range that a supercharger provides (as boost is directly dependent on engine RPM), especially with two-strokes having such a sudden and defined power-band. Also, for single cylinder engines, the inconsistent and low exhaust pressure becuase of the single combustion event per crank revolution (or per two revolutions for 4-strokes) is not ideal for consistent operation of a turbo. Finally, imagine putting two-stroke exhaust through a turbo; the soot and oil would quickly ruin the efficiency of the turbine, and the unburnt fuel could become very dangerous becuase turbos get *really* hot, kinda like a bomb. When you think supercharger=inefficient, you are probably thinking of a roots type. Twin scroll (Lysholm) and centrifugal (as used here, I think) types can actually be quite efficient. Centrifugal types are just the compressor side of a turbo driven by then engine through a hefty gearing ratio, rather than by an exhaust powered turbine. For a small engine like this, the efficiency gains of a turbo are so marginal that the instant boost and reliability of a supercharger are worth it. Turbos have a parasitic drag of their own, in that they increase the pumping losses of the engine. I don't know exactly how bad that would be in this case, but I do know that it would have a negative impact on the "free-breathing" of an engine that is meant to rev as high as this one will. I also think you would struggle to find a turbo suitable for a 50cc motorbike engine, since there are so many more variables involved in turbo design, such as exhaust flow rate and pressure for max efficiency, operating flow rate range, power producing regions, compressor output static pressure, flow rate etc. The supercharger is just the better decision for this application, in my opinion.

I’m guilty! Always waiting with anticipation for the next video to come out. Always wanted to mod a weedeater engine. This is saving me a lot of money and time with better results. Only thing that could be better is 4 cylinders in line!!!

I remember him making the piece, and stating that phrase upon inserting in the venture. IMO, the part will need to be modified to something like a Von Braun nozzle. The main fuel jet atomezition is based on the Content Velocity across the minor brass protrusion at the bottom of the venturi, yet the entire throat geometry has been changed. EFI?

Someone get this man a shirt making company! I want a picture of the 50cc with a "let's see how it behaves" on it.

Needs moor Joerg Laugh "Mwahahahahaaaaaa" !!

Welcome to the slingshot channel!

No way near as menacing as Jeorg Sprave tho

top fuel 50cc 2smoke bike world record quarter mile fs

agreed, I'd stay tuned to see that day. Hopefully it will produce 50hp and just easily smoke a ninja 400 LMAO that's a beast!

@@Astrix_Jaeger 😂🤣👍✌️🇬🇧

@@Astrix_Jaeger bros VERY optimistic for those power figures

So I'm going to do dumb math, I haven't heard how many bar it's running but let's say it'll do 20hp at 0 psi; at 1 bar and 50% compressor efficiency it's 30hp; and 2 bar 40hp would be my guess. The temps may skyrocket with the increased pressures. It'll be fun to see how the story turns out.

go on the 2 smokes

Starting to be phased out?

@@mennims Yeah he's getting on for 38 years late LOL. IIRC it started circa 1985.

He is no king of any two stroke of any kind that are piston port such as these you claim him to ve king ...as you just insulted pop yoshimura inventer of honda first two stroke the Elsinore ...who knew everything there is to know of two stroke engines As i was a study of a real genius famous world wide of every innovation of developing two stroke and four stroke technology from the 1950s to modern day products of yoshimura ..pop explained to us how a piston port with a reed valve or not ,exhaust power valve or not .of a natural aspirated two stroke traps the fuel mixture in the crankcase compressed by the piston's down stroke that instantly becomes a supercharged air fuel mixture pressurizing the combustion chamber before the piston up stroke compresses the already above atmospheric pressure to be compressed again before the engines fires making all two stroke dirt bike engines internally supercharged stock ..and when the resonance frequencies of the expansion chamber matches the rpm the sound wave of the pipe blocks the exhaust port making the rise in boost go off the charts ..this is what the power band of a two stroke is ..and what we call "on the pipe " is the revers megaphone effect of the sound wave from the sound of the gasoline exploding a supercharger mix of fuel that for a moment it time the sound wave seals in the highly supercharged pressure from escaping the exhaust port untill the piston closes off the open exhaust port that is the time you better be hanging on to your two stroke dirt bike and aiming it to were you want to go as when she comes on the pipe is rising supercharged to the max that throws you off the back and wheelies down the road by its self supercharged engine make three time more power and constantly increasing of any modern four stroke of same size today ...simply one fact that never changes is the air pressure at sea level that totally limits all four strokes to 14.7 psi entering the cylinder is the total of volume the four stroke can make all its power from that becomes less and less as rpm goes insane that in no time put a hole in the cases when the cam chain snaps in half ...but two strokes keep raising intake pressure far above 14.7 psi as i was instructed by the king lord and master of all two stroke tuning pop yoshimura ...of the secret of tuning this two stroke stuffer has not got s clue what two stroke stuffing refers to ..has not got a clue of what was call the boost ports and how they function ..has not got a clue of how all two strokes of his 50cc design are internally super charged ..has not got a clue of how and what is the power band nor can he tell you the correct function of how an expansion chamber functions ...and most of all he doesnt have a clue of which way to modify a two stroke to make more power other than adding an external mechanical supercharger that can possibly help to make more power when the exhaust port is fixed open not allowing boost to remain in the cylinder but forced out the exhaust port all the time ..UNLESS YOU INSTALL A ROTARY EXHAUST VALVE THAT HAS NEVER BEEN DONE AS ITS MY IDEA THAT APPARENTLY OL STUFFER HERE READ MY COMMENT WITHOUT SO MUCH AS KISS MY ASS OR A FUCK YOU ..BUT DIDNT MIND ASKING ALL IF THEY EVER SEEN A ROTARY EXHAUST VALVE AND ALL WILL BE LYING AS THERE HAS NEVER BEEN A ROTARY EXHAUST VALVE TO EVER EXIST BUT ONLY IN MY DREAMS THAT WILL AND DOES ALLOW ANY SIZE SUPERCHARGER TO SUPERCHARGE A TWO STROKE UNTIL IT TURNS INTO THE WORLDS MOST POWERFUL GRENADE

Two strokes make boost , were as four strokes can only suck ...and what do you think is going to happen pulling all carbon dioxide from the air as all now think will stop global warming ...that as it is we live on a carbon based ecosystem meaning carbon dioxide is the essence of all live on this planet we call home ..and by removing the first of the dominos of our food chain carbon dioxide the plants turn into sugar to be eaten and not stored like you are being told by guys like elon musk who sells the captured carbon dioxide to greenhouse farmer who have no choice than to buy cause at present level of 0.03% co2 plants are dying all over the world = no more production of oxygen as O2 levels are falling fast and now are within Just 1/2% to a level you probably wont like cause you will be dead no question but dead ..in about 3 moths from now as the direct carbon dioxide removal is screaming wide open and nobody knows its killing every stinking one of us

Thanks! Yes, should have remembered that, I've even done testing on e85 before by adding water to check %.

Hygroscopic is the word to describe alcohol's tendency to absorb water from the air. Brake fluid is hygroscopic too

lot of flutter in the chain too. If its for land speed a heavy flywheel?

Lots of things in need of improvement, Iwant it to run ok before I start optimizing.

Sudden diameter changes also introduce a resonance pulse up and down the intake tract.

I was wondering whether that idler was on the drive side or not while the other side was whipping around.

@@2STROKESTUFFINGPip Higham that's a name I know, I didn't know Pip Higham made or tuned 50 s . He's the famous Susuki tuner ..I remember he bought a brand new GSX 750 tuned it and blew all the competition away back in I guess it must of been 79... Stan Stevens was the man back in the 80 s who was more known for 2 strokes, my mate had a 250 lc that we were all very jealous of..I met Pip at a meeting at Avon park many years ago..yes a clever guy .does he know about your engine..

I don't think those will cope with 30hp.

@@rubikmonat6589 for the most part they deal with the full horsepower from a car engine they do cycle off after 70% throttle in a car. And most vehicles make more than 100hp at 70% throttle.

@@jaxperez7860 they aren't holding back 100hp though, they're only holding the resistance that an ac compressor has against the engine, maybe 5-10hp max.

@@jonathan7744 true , i think it will work, no point in not trying , I feel like the amount of pull the magnet has on the friction plate should be more than enough to handle it.

@@jaxperez7860 I sure would like to see it tried atleast. Would be tricky but cool.

Or maybe a pneumatic clutch like the fan clutch on a diesel semi truck engine. They don't have any issue grabbing the fan at 2000 rpm. The newer engines with all the epa crap need really aggressive fan blades to keep them cool.

@@andypughtube Im not really into this but i think in some car engines with a supercharger and a turbo they used a electromagnetic clutch to decouple the supercharger at high rpms, maybe this clutch woulb be strong enough. A pneumatic clutch (or maybe a hydraulic clutch too) is surly strong enough but i dont know how fast it opens and close and thats relativ important here.

@@tuckercurrie3420 Actually the clutch you talk about is likely to be to reduce engine load when cooling is not necessary and also to allow the system to warm up _more_ quickly. The aim is to get the aftertreatment working as soon as possible. Diesel engines lose a lot of heat through the block (I have run engines at part load and found that the dyno fans were enough, the thermostat never opened. As I was trying to sign-off the thermostat design, this was unhelpful)

@@andypughtube Well I wasn't really asking what the engine fan was for but thanks I guess.

👍 I made the sleeves eccentric, and that step was ment to be ground out after gluing, but...

@@2STROKESTUFFING - I guess I was pointing out that there was a step and how I thought that would affect it

@@Scissors69 And you were absolutely right😁

@Dave Goodwin - Well spotted!

Land speed. It will be run at or near wot. Not designed to idle.

I know!

Yes it finally started sounding proper. It started doing the typical "pop" that means it's running well. Before that everything sounded dead and it wasn't idling naturally.

I hope he does because id be building a drag bike out of it

A twin cylinder water cooled 125. Happy memories of hours of fiddling with a Yamaha air-cooled 125cc twin belonging to a friend.

He really needs to read this comment!!!! He should try a much longer, smaller pipe, to help the engine fill at low rpm, then incorporate some sort of bypass for high rpm, full throttle operation.

The expansion chamber is tuned for 19000.

@@malcrandall1309 That seems well above the RPM that this engine needs the pipe to scavenge the cylinder below that 'Hump". At boost the pipe won't be reflecting pulse waves back into the cylinder, but at low boot it's needed

This expansion chamber came from Alex's first rendition of PiP which was going to use a N/A twin induction sysyem which included a resonant induction system fed with fuel injectors. Alex was developing the Brute Force concept at the same time. Alex added the roots blower to the Brute Force engine and ran into exhaust valve trouble leading to it's cancellation for the time being. PiP was re enstated with the Rotrex where we stand today. The idea was for PiP to hold 19000 by using a variator transmition on Moped Dick at Bonneville.

@@malcrandall1309 I've ben following Alex for quite some time now. The twin tube exhaust was a definitely cool idea, maybe some more work? My thought was only that maybe this engine requires a different tune on the expansion chamber to help it get over the hump. When on boost, the engine will require less pull from the pipe to clear exhaust gasses, and it will be needed less to backfill the chamber. Just my thoughts

so basicly lika car carb with 1 bigger 1 smaller butterfly clamp.This could maybe work

Good idea....Thats the way my toyota works. 2 barrel carb. Only one opens at low rpms. Both open when i step on it.

@@joebloe9901 i think it would be easier to just fit a small seperate carb rather than using a twin choke set up or the four barrel type car stuff, the smaller carb could be made to close entirey as the bigger carb takes over

He has had dual carbs in the past like you’re suggesting; great minds think alike!

Newton millimetres of torque and 200,000rpm. Sounds fun.

😂

E85 is available in Scandinavia and cheap. But I think you need special 2T oil (castor (not Castrol)) since ordinary oil won't mix well with E85.

@@nhytg376tgyuu765gjmg Ordinary oil won't mix with methanol either, he'd already be running castor (or another alcohol compatible oil) in the fuel he's using.

@@nhytg376tgyuu765gjmg I've turned some rotaries running in e85 with premix, Klotz makes great stuff for alcohol blends. But as nerd already noted he'd already have to be running something like that with the methanol, so should be no big deal.

I think it's kept konstant.

Yes. He uses an pressure Regulator with boost correction.

@@marvinrausch1735 True, I forgot about that.

Thats what i was thinkin. The super charger is pressurizing the carb forcing fuel to go backwards. It should be sucking fuel in a vacuum.

@@joebloe9901 He has a boost referenced fuel system. Draw-through setup isn't possible because the fuel would eat the seal on the blower shaft.

@@nerd1000ify Then why is he concerned with the carb metering jets in the vijeo? Roots blowers have the carb on the intake side. I missed something.

@@joebloe9901 Back when the engine was running a roots blower Alex did indeed have the carb on the intake side. That blower had seals that were compatible with the fuel, on this one he's worried that they may not be, or that fuel may sneak past the seals and contaminate the special oil used in the friction drive that spins the impeller. Carbs can work on blow-through setups so long as they are referenced to manifold pressure. Alex has achieved this by routing all of the carb vents to a pitot tube between the blower and the carb. This would not work if he was using gravity to feed the fuel (boost pressure would prevent fuel flowing into the bowl) but he's using a fuel pump with a regulator that also references to manifold pressure. As for the metering, the main issue here is that the carb is too big for the engine. This is why Alex sleeved it down (leading to the shenanigans with the 'step' in front of the needle jet), and it's also why he needs different needles, at the moment the relative depression in the venturi isn't enough to pull sufficient fuel flow through the carb.

How do you get to see dislikes?

To me every time he opened the valve it seemed like the revs climbed to a flow limited rpm, somewhere around 18-20k or so, and held there. Crazy how fast he's spinning that thing, though I'm guessing peak power is quite a bit lower, probably 12-15k range.. Although with more flow he could potentially spin it even faster and make some crazy power numbers, but the more top end he gets, the more difficult it's going to be to start and idle.