Question: how do you calculate cubic inch displacement?
Answer: The will result in the overall volume of air displaced by the engine. For example if we have a bore of 4 inches and a stroke length of 3.52 inches on an 8 cylinder engine, the displacement would be: Displacement = (4 in./2) x (4 in./2) x 3.1416 x 3.52 in. x 8 = 353.86 cubic inches.