Daven

Is there a major problem with having a constant measure of air fed into the intake at all times? Superchargers and turbos change with RPM, but is there a reason for this besides conveniance? Would there be a problem with a constant feed of air? aka not changing with rpm's?

Djs94stang

It depends...so long as you could provide enough volume of air to maintain a certain pressure at all rpm's. Otherwise you'd have a lot of pressure at low rpms (that you don't need) and you'd have very little to no pressure at high rpms.

94BOOSTDCobra

plus you woul dalways need the fuel to match the air or else you would LEAN

Derf00

Without the constant change in the amout of air or CFM there would be a huge problem. The ideal air-to-fuel mixture is 14.1:1 that means for every 14.1 particles of air in the combustion chamber, there is 1 particle of fuel. In order to create power at various RPM's the ratio of Air to Fuel has to be accounted for. If you keep a constant volume of air regardless of RPM you do one of two things Choke the engine (Not enough air) or Drown it (too much).

Try running with only being able to breath in a 'normal' breath' Works fine at first but as your body requires more air you get winded and can't maintain the 'power' (pace)

Daven

ack, guess thats out then, thanks.

Birdieman4

A perfect example is a twin screw blower. Positive displacment blowers don't rely on engine rpm's for hp. With the hit of the throttle at low rpm's, positive displacment blowers make huge torque anf hp, and thus need to be tuned accordingly. It's simply a matter of matching the amount of fuel going into the motor with respect to it's hp and torque curves. All hand held tuners can easily accomplish this. -So, there's no problem with a constant air feed, as long as the motor is getting fuel flow.

Daven

Hrrm, then i may do this prodject.

I think im going to try to make a cheap-ish supercharger with a dust blower I got a few weeks ago. It should be pretty simple, it would have to be mounted above-hood but oh well. I think it will go great with my wifes focus.