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PI * W * (2 * D - L) * (L - D)

Sometimes 3 is used instead of PI, and may actually be closer due to mechanical efficiency.

Formula is the same for CID as it is for cm3 (CC's), just a matter if you use inches or centimeters for L, D and W.

W = Height of gear (how thick the gear is).

D = Diameter of gear.

L = Length from edge of one gear to the edge of the other across both gears.

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