Derateing the carb CFM with f arrestor
02-22-2002, 10:56 PM
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I run K&N's with Extreme tops. As for carb sizing there is a simple formula for naturally aspirated motors;
Required CFM = CID X RPM / 3456 X VE (volumetric efficiency)
If you don't know VE then assume 100% max unless you have an exotic setup where you can see 110% (high rpm's, long duration cams, higher compresssion, geat heads,etc) . Most engines are only about 85% efficient though.
I've actually seen test results (Not from K&N) showing MORE Air flow through an air filter set up over nothing.
Required CFM = CID X RPM / 3456 X VE (volumetric efficiency)
If you don't know VE then assume 100% max unless you have an exotic setup where you can see 110% (high rpm's, long duration cams, higher compresssion, geat heads,etc) . Most engines are only about 85% efficient though.
I've actually seen test results (Not from K&N) showing MORE Air flow through an air filter set up over nothing.
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