Quote:
Originally Posted by slowbird
Buy pipemax, very cheap software, tons of info, and will not lead you down the wrong path. No header builder that i've talked to has ever asked me for exhaust flow numbers.
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Correct. EXH travel length & ID for best "CFM" (try CFS) is thermal-dependant.
The thermal dependancy is CSA & Length dependent. These tings show up as EXH velocity vs travel length.
Id be keen to see a plot of EXH dia vs RPM for best ET. Could be an eye-opener.