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Site Admin
Joined: 22 Dec 2005
Posts: 640
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 Posted: Wed Jan 18, 2006 9:09 am Post subject: Carb CFM Needs |
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Carb CFM Needs
Take 1/2 of the total cubic inches and divide it by 1728 cubic inches (the amount of cubic inches in a cubic yard). This gives you a multiplier that is air displaced per crank revolution.
Multiply this by your max rpm.
Multiply that by your volumetric efficiency. (90% is reasonable).
This is the amount of cfm required at your given max rpm. Remember that just because a carb is rated at a certain cfm, doesn't mean it will flow that much air since you have to take frictional losses into consideration as well. |
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