smog pump supercharger!!!

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rock-star-4life@live.com

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i have this minibike i want to supercharge with a smog pump i have laying around..... but i dont know how to have it blow through the carburator. its one of those brigg carburators with the gas tank underneath it. i could just mount the carburator infront of the smog pump, but whats the fun in that!!

submit your ideas!!! help the cause!!
 
Fast Eddie

Fast Eddie

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Great idea. I know in automotive applications when you have a supercharger mounted upstream of the carb, you have two options. First is modifying the carb so it operates under positive manifold pressure (something to do with the floats not coming off their seats). The other option (which would probably be the best for you) is to build an enclosure to house the whole carb and introduce pressure via the pump to the whole enclosure. Similar to this:



Good luck!
 
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Kenny_McCormic

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You will probably need to pressurize the tank and eliminate the vented gas cap (just gut the cap and solder a barb on for the pressure)so the fuel pump (runs off intake pulses)operates. You will also need to run the stock PCV to a vent can and plug off the hole you just made in the carb. Jet will probably need drilling.
 
I like karts

I like karts

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hmm... that's interesting. They have the pump after the carb instead of before it. It seems this would be a good Idea, as you wouldn't have to pressurize the tank or anything. However, the gas/air mixture going through that pump probably changes the amount of gas going in (It probably condenses inside the pump somewhere). So you most likely would want to run it really rich to keep it from leaning out.
 
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rock-star-4life@live.com

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EFI would be hard to do... but i think draw through would be the easiest, i looked closer at the smog pump i have and its from a 84 escort. in a few weeks ill post some pics of it and my homemade mini bike
 
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modelengineer

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Someone beat me to it. I was going to suggest putting the carb before the smog pump, then you don't have all the hassle with pressurised fuel tanks and simple ( :roflol: ) EFI systems.
 
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Just a theory

Pump feeds fuel to injector, pump runs off a 12volt battery, needs some sort of adjustable pressure regulator to adjust mixture. Maybe just run it off a adjustable resistor to lower voltage.

Injector gets 12volts from transistor switch engaged by a pickup triggered by the flywheel magnet with a capacitor so once the pulses start coming in (motor spinning) the injector contantly injects.

The power between transistor and injector is limited by a variable resistor controlled by the gas pedal, more throttle=more power to injector=more fuel to engine.

Injector feeds into throttle body after butterfly valve.
 
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