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The following equation is a good rule of thumb for throttlebody diameter (~ +/- 5%)
D (“) = sqrt[(WHP x 4)/(AP x CR)]
sqrt = square root
D = diameter of throttle body (single)
WHP = wheel horse power
AP = Atmospheric Pressure (14psi)
CR = Engine compression ratio
Cross Sectional Area = 3.14 x (D/2)[/FONT]
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