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The formula to calculate the total displacement of a multi-cylinder piston engine is…

  • A
    piston area x piston stroke.
  • B
    cylinder length x cylinder diameter.
  • C
    piston area x piston stroke x number of cylinders.
  • D
    cylinder volume x number of cylinders.

Refer to figure.
The displacement of a cylinder corresponds to the volume of air a piston is ‘moving’ during its linear translation. An engine is composed of several cylinders and the volume is calculated by multiplying the area and the length together. When speaking about the cylinder’s motion, the area we need to consider is the piston’s area and the length is the linear length from TDC to BDC the piston is traveling (stroke). Therefore, the resulting formula is:

Piston Area x Piston Stroke x Number of Cylinders


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