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Old 03-31-2011, 11:49 AM
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Re: Engine Size and Cubic inch

Cubic inch displacement:

Cylinder bore * bore * stroke * # cyl * 0.7854 = cubic inch displacement.

For example, a Chevy 350 engine, which has 8 cylinders, a 4" bore and a 3.48" stroke:

4 * 4 * 3.48 * 8 * 0.7854 = 350 (actually 349.858 rounded up).

The same formula works for determining metric sizes as well, just use the proper numbers.
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