Find the bore and stroke in millimeters then: ((1/2 Bore)^2 * 3.14 * Stroke * number of cylinders) all divided by 1,000,000 to end up with liters. Perhaps in more simple terms: divide the bore by 2, square the results then mutliply it by 3.14. Take that product and multiply it by the stoke then the number of cylinders. Take the result from all that and divide it by 1,000,000 to come up with the engine's displacement in Liters.
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