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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,478
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I used:

displacement x rpm x 1/2 x volumetric efficiency x pressure ratio = cfm

so your engine would be:

193 cu in x 7,000 x 1/2 x .9 x 1.51 = 532 cfm

volumemetric efficiency may be below 90%, but that's what I used to be safe.
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2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 06-16-2008, 11:59 AM
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