Wills Rcsb Build
#157
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iTrader: (38)
Joined: Oct 2005
Posts: 1,299
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From: cedar bluff,alabama
CFM required for a 4 stroke motor = CID x Maximum RPM / 3456
CFM required for a 2 stroke motor = CID x Maximum RPM / 1728
CFM required for a turbocharged or supercharged motor = Pounds of Boost / 14.7
Add 1.0 to this answer. This relates to #2 and #3
Example: (CID x maximum RPM x #4 ) / 3456 or 1728
To find circumference of a circle multiply diameter by 3.1416
To find diameter of a circle multiply circumference by .31831
CFM Formulas for Filters
Round: Diameter x Height x 6 x 3.14
Flat Panel: Length x Width x 6
Universal Round Taper: (Base + Top) / 2 = A
Take A x Length x 6 x 3.14
Universal Round Straight: Diameter x Length x 6 x 3.14




