Alright guys, I have a Crazy Idea. I know it will probably not work at first, and will take tons of trial and error to make work, but I think it will be worth it. Here goes.
Imagine a plate mounted beneath your carburator with two tubes going in. One supplying fuel, (alchohol maybe ) and another mounted above it. This will be bent down and blow pressurized air over the tube below it. I am thinking that i can have a small tank running to the tube for fuel in which a small perfoated tube (like a carburator air bleed)will dip. When the compressed air moves over it it will suck out and atomize the fuel. This air fuel mixture will have high velocity and quantity and be pressurized. The air/ fuel mixture could be adjusted by adjusting the air pressure, and the size of the air bleed thingy. The tank will be fed fuel by bleeding off fuel from the fuel line, or have a separate tank of alchohol to feed the little tank. The little tank will have a little float to contol the fuel coming in. (like a carburator float bowl). This float bowl will be fed by the stock crummo fuel pump.
I have also thought that instead of using an air bleed type thing to atomize the fuel into the pressurinzed air stream, I could use something like a fuel injector to spray a fog of fuel into the stream of air.
To supply the pressurized air I will have a little tank of pressurized air. I realize this will probably only last one quarter mile. But I suppose I could run a small compressor to refill it between runs. Maybe one of those compressors used to lower or raise air shocks from inside the car would work. The pressurized mixture will only be sprayed when a button on the shifter, or where-ever, is held down. Wouldn't wanna have it on all the time or the motor would rev up without you touching the gas pedal
Cheap, effective, forced induction. I guess the real question is, do you think it is feasable? It will probably be a real pain in the butt to tune, but I figure after the pressurized air has expanded to fill the volume of the intake manifold, you could have a good 6-7 psi or more of pressure if you set it up right.

 

It would only work if you used it with the throttle shut. Otherwise there would be no airflow through the carb.

Also, the tank of pressurized air would have to be about as large as the car itself...

 

Or you could just buy NOS .

~T.J.

 

yeh, nos is a better Idea, and safer.

 

how much air do you use in a quarter mile run anyway? It couldn't be that much. A lot of air can compress into a very small space. Couldn't you just run a reasonable sized tank with the air compressed to a very high pressure? Then just let it out at the pressure and rate you need? Keep the opinions coming.

 

We can do the math, actually.

Let's say the engine needs an average of 225cfm to go down the 1/4mi in N/A form. Over the course of let's say 13 seconds, that's 48 cubic feet of air. (Imagine a box 4 feet by 4 feet by 3 feet) Since you're going to be pressurizing the engine, let's say that's, oh, 7psi of manifold pressure. We could halve the size of the container by doubling the pressure to 28psi (7psi boost is about 21psi absolute, double that is 42psi absolute, minues about 14psi ambient is 28psi) 2' by 4' by 3'. Double the pressure again - now we're at a 2' by 2' by 3' tank with 70psi (84psi absolute) in it. Double it again - now we have a 2' by 2' by 18" container with 154psi (168psia) pressure. That would almost fit comfortably in the hatch, although I wouldn't want my head anywhere near something with that much pressure in it. You could double pressure again for 1'x2'x18" - almost about what a commonly-available portable air tank is - but they aren't rated to hold 324psi(336psia) !!

 

so about 6 scuba tanks at 3000 psi should wokr then?

 

Or you could just buy NOS...

~T.J.

 

*shakes head* Crazy yanks.

 

use a Nitrogen tank meant for paintball, you can get them rated up to 4500psi up to about 110cubic inches, and put a low pressure regulator on it and use it to tune it down to what you need. Kinda expensive, but compact and safe.

 

Hey! You guys are the ones putting Triple sequential turbocharged 20B's on tricycles and 12A turbos on blenders. I'm suprised theres not rotary powered playground equipment down there...

Crazy aussies, rotarizing everything.

Adopt me!

 

I see what you mean Peejay. Ok, new idea. I have a jet shooting cold air directly into each of the secondary venturis. No manifold pressure, but a high velocity charge that will suck fuel out the float bowls at the proper rate. No compromises like bigger venturis. I can get high velocity air through the venturis all throughout the range not only at the top end, and I wont need 3 million cubic feet of air packed into a 1 by 1 by1 inch cube. Do you think this could work? Or like rotormotor says, i could just buy NOS

 

NOS would be a better idea but works on a little different principle. NOS is not fuel but is mixed withthe fuel to allow the atomized fuel to be compressed more. In other words allowing more atomized fuel into the engine. You wouldnt want to use this too much or you'll ruin your engine.

Although i think your idea would probably work if you figured the mechanics or it correctly so you dont blow your engine or over heat it.

 

Just buy NOS .

~T.J.

PS - Its a lot easier too, no special "tuning" and what-not

 

the way to do this is to use a high pressure cylinder (there are ones made for compressed natural gas that are DOT certified, and are lighter than industrial tanks because they have composite overwrap), then use a first stage regulator to reduce the pressure to some intermediate level (say 125 psi). the first stage is necessary so as your tank pressure drops, calibration of the system doesn't change. From there, you'll need a nozzle actuated by the throttle (like a fixed orifice with a cone in it that lifts) to control air flow into the manifold. For the whole thing to work in this mode, the traditional throttle butterflies would have to be shot (well, they don't have to be, but once you go under boost, air will leak out).
It would be much more practical to use fuel injection with this, particularly speed density type that calculates fuel flow based on pressure and temp.
another side benefit of the whole compressed air idea is that as it depressurizes, it cools...
One problem you might encounter is finding a commercial first stage regulator that will flow that much air, but i'm not sure.
another alternative is to use a compressed air motor to drive a turbo (as opposed to exhaust)...