4/25/2023 0 Comments Harley engine serial numbersThis formula is an extremely accurate method that can be useful when determining the displacement of a modified, high-performance engine, but is equally applicable to stock engines, as well. This results in a 96.7 cubic-inch displacement, using the same formula. Likewise, the newer TC96 engine has an identical bore, but a longer 4.38-inch stroke. Using the formula above, it would appear as: 3.75-inches x 3.75-inche x 0.785 x 4.00-inches x 2 cylinders = 88.3 cubic-inches. A TC88 had a 3.75-inch bore and a 4-inch stroke. Let's use a typical Twin-Cam 88 engine, which was used between 1998 to 2006, as an example. In this case, B would equal bore, p/4 is pi - 3.14 - divided by four, S equals stroke and N is the number of engine cylinders. The formula used to determine engine displacement appears as: B × B × p/4 × S × N = Displacement. Bore and stroke refer to the inner diameter of an engine's combustion chamber within the cylinder head and the distance of the piston moves from top dead center to top dead center in a single movement, respectively. ![]() ![]() ![]() The most accurate method to determine a Harley-Davidson's total displacement in cubic-inches is by using the engine's bore and stroke specifications however, this can only be done if you can obtain these specifications through a service manual, magazine review or a spec sheet provided by the engine tuner.
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