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      10-31-2012, 10:55 AM   #11
Protocav
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Drives: 2008 E90 M3
Join Date: Aug 2012
Location: San Diego

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Mass flow rate would be approximately calculated by taking the size of the motor, multiplying it by the RPM that you want to focus on (i suggest making a spreadsheet to see the mass flow rate across the RPM range) and dividing by two since the engine only exhausts every other rotation (since it is a 4 stroke). These calculations assume 100% volumetric efficiency also.

Remember that you must divide this final answer by two, because you are making a dual exhaust.