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Engine Capacity or Cubic Capacity or 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). Since 'cc' stands for cubic centimeters, everyone regards it to be the volume of cylinder. But actually it is the Displacement volume of a cylinder (in case of single cylinder engine). In other words it is the volume of the piston travel from TDC to BDC. It does not includes the clearance volume or the volume of the combustion chamber. The cylinder volume for a single cylinder engine is higher than the 'cc' of the engine. Also the 'cc' specification for any engine is rounded off to nearest value. It is never exact. For example, Bajaj Discover F150 bike had 144.8cc engine but it was always regarded as an 150cc engine bike.