Ok, so we supercharge and turbo charge our cars to get more air into our engines. We port and polish every piece we can to get the most air we can thru the engine. So what I was wondering, instead of letting the engine preassure and free flowing exhasut tempt the air out of the engine, what would the feasibillty be of haveing something along the principles of a supercharger to suck the exhaust gases out? I'm guessing there may be a reason why I haven't seen it yet, but then again....

i thought backpressure was there for a reason?

Possibly, but if you can get more out, then maybe you can force more in as well. That would maintain backpreassure while flowing more air?

the reasons for backpressure have been discussed before, but its been a while, ill have to go dig up the discussion, but putting a pump on the exhaust would reduce fuel economy and increase emmissions, and probly decreased performance too because of valve overlap, with the right cam, it might actually increase fuel economy.

You'd drop the compression ratio too.

There'* absolutely NO reason for backpressure AT ALL.

The problem with a huge exhaust, is that the CFM drops because velocity falls off too much. Too big of an exhaust doesn't create backpressure, but it doesn't get it out the fastest.

u mean compression, the compression ratio remains constant unless the bore, stroke, pistons and/or heads r changed.

x2 u saw it first

I cite a brain fart.

i did not fart oh u mean him