Engine displacement is defined as the total volume of air/fuel mixture an engine can draw in during one complete engine cycle; it is normally stated in cubic centimeters, liters, or cubic inches. In a piston engine, this is the volume that is swept as the pistons are moved from top dead center to bottom dead center.
Engine displacement is calculated using the bore, stroke, and number of cylinders:
displacement= π/4 × Bore² ×Stroke× no: of cylinders
Fig: the above figure is that of a 4-cylinder engine. Here the displacement is π/4 × Bore² ×Stroke×4 (where 4- no: of cylinders)
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