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Old 08-01-2005, 05:38 PM   #1
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Exhaust scavenging and valve overlap...

Just to clear things up...from what I read, a little backpressure in the exhaust system is supposed to help with scavenging and ridding the cylinder of exhaust gases during valve overlap, at least in your everyday production car.

However lets say you have a valvetrain with zero or very little overlap, this scavenging becomes pretty much useless, right? In which case, the objective is to reduce backpressure to pretty much zero, correct?
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