[Grubby]

Guys,

I found a calculator on the K&N website. It shows that a 447cid with max 6000 rpm would need a filter 5.76" tall x 8.188" OD. The typical S&H replacement is 1.875" tall.


A=(CID X RPM) / 20,839

A = effective filtering area
CID = cubic inch displacement
RPM = revolutions per minute at maximum power


Example: A 350 CID Chevy engine with a horsepower peak at 5,500 rpm.

A=(350 X 5500) / 20,839 = 92.4 square inches

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H=(A/D*3.14)+0.75

A = effective filtering area
H = height
D = outside diameter of the filter
3.14 = pi
0.75 = the rubber end caps


Example:

H=(92.4 / 12 * 3.14)+0.75 = 3.20 inches



John