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Engine displacement is the volume swept by all the pistons inside the cylinders of a reciprocating engine in a single movement from ''top dead centre'' (TDC) to ''bottom dead centre'' (BDC). It is commonly specified in cubic centimetres (''cc'' or ''cm3''), litres (''l''), or (mainly in North America) cubic inches (CID). Engine displacement does not include the total volume of the combustion chamber. ==Definition== 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. : Or in decimal form: : 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 litres 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Engine displacement」の詳細全文を読む スポンサード リンク
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