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Engine Displacement:

 
The engine displacement is the number of cubic inches (cu. in.) the piston displaces when it moves from bottom dead center to top dead center.
 
To calculate displacement, calculate the Area of the piston face; multiply that by the Stroke, then by the Number of cylinders. Example: (D=A x S x N) 11.800 x 3.750 x 8 = 354 cu. in.