Engine displacement of a car generally means the volume of an engine’s cylinders, a general indicator of its size and power. The displacement figure represents the total air displaced by the pistons in all of an engine’s cylinders and is expressed in liters, cubic centimeters or cubic inches. The size of these cylinders loosely defines the size of the explosion within, which is why displacement suggests an engine’s power. That said, many other factors affect an engine’s output, including the number of cylinders, the compression ratio within the cylinders and the induction system. Turbochargers and superchargers net higher engine output by forcing more air — and thus more fuel — into the cylinders, which results in a more powerful explosion than would occur in a normally aspirated engine, all other aspects being equal.
Engine displacement is determined from the bore and stroke of an engine's cylinders. The bore is the diameter of the circular chambers cut into the cylinder block.
To simplify:
Examples: The 427 Chevy bore is 4.312 in, and the stroke is 3.65 in, therefore the displacement for this eight-cylinder engine is:
3.1416/4 × (4.312 in)2 × 3.65 in × 8 = 426.4 cu in
Or: (4.312 in)2 × 0.7854 × 3.65 in × 8 = 426.4 cu in
If the bore is 10 cm and the stroke is 5 cm with four cylinders, the calculation is:
3.1416/4 × (10 cm)2 × 5 cm × 4 = 1,570 cc = 1.57 liters
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