Homemade Turbo Charger or not!

[dbrannon79]

Hello,
This might be a wild thought, but I was thinking about how a 50cc 2 stroke would react with a slight push of air into the carb. What caught my attention was when I pulled my air cleaner, I noticed a square hole in the plastic shroud that housed the cylinder head and jug. the thought crossed my mind of installing a tube that would force the air flow from that opening into the throat of the carb and act as a sort of turbo! any thoughts on this?

I don't necessarily want to end up restricting the air flow that cools the engine, but by forcing some extra air into the engine, would that give some extra performance?

[stepthrutuner]

No. Your carburetor depends on vacuum to draw a fuel/air mixture into the throat of the carb and putting pressure in there would screw up the works.

[dbrannon79]

I wouldn't say it would be actually pressurizing it, it will only be fan forced air from the cooling fan. not from a pump so to speak. I realize that pressure can force the fuel back into the bowl of the carb.

I properly meant to title the thread supercharger because a turbo relies on exhaust pressure also. if my thinking is correct, the extra air flow through the venturi on the carb will allow the air/fuel ratio to remain. I may need to create a relief for extra air to escape in order to prevent pressure from building. Although the fan driven air will be hot due to it flowing over the cylinder.

[90GTVert]

See how hot that air is once your engine is warm. Even if, and that's a big if, that amount of air movement would increase performance the amount of heat you'd be introducing would make it pointless. Why would you wanna draw in air that's passing by a 200+ degree cylinder when you could get cool fresh air?

[dbrannon79]

May 26, 2010 20:20:57 GMT -5 90GTVert said:

See how hot that air is once your engine is warm. Even if, and that's a big if, that amount of air movement would increase performance the amount of heat you'd be introducing would make it pointless. Why would you wanna draw in air that's passing by a 200+ degree cylinder when you could get cool fresh air?

You do have a point! it was just a thought I will have to rethink the idea for feeding it cool air! Any ideas? ;D

[Reign]

Maybe take it directly off the fan? Maybe drill a hole in the fan shroud and mount a hose that feeds into the airbox? I'm not really seeing how this would help, but I guess it's worth a try.

[stepthrutuner]

You're opening up a big can of worms. To make anything like this work you would have to seal the entire carb in a chamber and feed the air to the chamber (this way the vented float bowl 'sees' the same pressure as the available throat air and the fuel flows in the proper direction). You would also have to run a fuel pump and regulator to pressurize fuel to the carb and, of course, seal this fuel input line where it enters the carb chamber. Also you would have to build in back pressure in the exhaust to prevent a good amount of unburned mixture escaping and avoid poor fuel economy.

Why not keep it simple and use the performance-enhancing supercharger with no moving parts and a muffler on the end called an expansion chamber. As much as 7psi of supercharging pressure can be rammed back into the exhaust port with one of these marvelous devices.

[felliott]

Need to remember if you are pushing air though the engine any vacuum lines will now turn to pressure. If you have a vacuum fuel shut off you will need to replace it with a manual one.

[jimh]

Hey Frank, welcome to the forum!

[90GTVert]

He's been around nearly since the beginning, just doesn't say much. lol I dunno if I ever said welcome either though, so just in case... :welcome:

[Fox]

On that Buddfab streamliner they put the carb on the turbo inlet and the turbo outlet into the intake so the carb still works off vacuum.