These separate volumes allow you to calculate the engine’s compression ratio (described in Chapter 3.) Please note here that the actual swept volume is not the total volume of each cylinder since it does not include the volume of the combustion space above the piston at top dead center (TDC). The result is the actual swept volume of each cylinder and the total swept volume of the engine assuming 100 percent volumetric efficiency. Displacement is determined by a calculation involving the bore diameter and the stroke length times the number of cylinders. I discuss appropriate conversions later in this chapter. Here in America we typically work in cubic inches while the rest of the world uses the metric system. Displacement is the size or volumetric capacity of an engine expressed in cubic inches, cubic centimeters, or liters. Engine displacement is the most common math calculation.
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