Engine Displacement

Engine Displacement (sometimes called Piston Displacement) refers to the volume that a piston displaces as it move from the top of the cylinder (TDC) to the bottom of the cylinder (BDC). An engines displacement increases by increasing the number of cylinders or by making the combustion chambers of all the cylinders bigger (or both). Alternatively, by decreasing the number of cylinders or by decreasing the size of the cylinder (or both) you decrease the engines displacement. This unit will introduce you to engine displacement definitions, in addition to showing you how to calculate and engines displacement.

Definitions and Vocabulary

Piston Displacement- the volume the piston displaces, or takes the place of, as it moves from Bottom Dead Center ( BDC) to Top Dead Center (TDC). Piston displacement can be measured in liters, cubic inches, and cubic centimeters.

Bore - the inside diameter of the cylinder.

Top Dead Center - is the extreme top position of the piston in the cylinder.

Bottom Dead Center - is the extreme bottom position of the piston in the cylinder.

Stroke - is the distance from bottom dead center to top dead center.

 

 

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