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How to calculate engine displacement

Discussion in 'T-Bucket Engine and Driveline Articles' started by Mike, Dec 13, 2010.

  1. Mike

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    Well-Known Member

    Oct 23, 2006
    Likes Received:
    There are different formulas for calculating engine displacement in cubic inches, but I've always liked to use this one, as it allows you to figure total displacement for any engine, from a single cylinder on up.

    The formula is as follows -

    Bore[sup]2[/sup] X Stroke X .7854 X Number of Cylinders

    Using the stock bore and stroke of a 350 Chevrolet, we can test the formula.

    Bore X Bore (or Bore[sup]2[/sup]) is 4.000 X 4.000 = 16.000

    Multiplied by the stroke of 3.480 = 55.680

    Multiplied by .7854 = 43.731072 (which is the displacement of one cylinder)

    Multiplied by 8 (number of cylinders) = 349.848576, which is rounded up to 350 cubic inches.

    Keep this formula handy and you will always know your 350 will be a 355 after being bored .030 or a 360 after a .060 overbore. Go ahead and give it a try.

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