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Originally Posted by BigBlueSVX
not sure about that, but I know that a poorly designed system (ex: too big piping) will give less power because the system does not pull the exhaust gases out of the cylinder (scavenge) as efficiently, not because there is too little backpressure. You don't want any backpressure, in fact, you want a pressure lower than atmospheric at TDC to help pull exhaust gas out of the cylinder and the fresh charge in.
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check the very, very short header pipes on Top Fuel and Funny Cars -- the ignition event actually extends out of the pipes (ie flames!). I realize that this is an extreme case....
-Bill (realizing he should probably pull his exhaust system design handbook out...)
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