Engine Displacement / Engine Size

Engine Displacement (CC)

Engine displacement is a total cylinder volume of any engine which is displaced by all the piston in the combustion chambers. Displacement is used to define an engine’s size and power output.

What is meant by swept volume of an engine ?

The Swept volume is a volume of any engine that is cover by the engine piston during one stroke. Swept volume is also the product of piston area and stroke.

What is clearance volume of an engine?

The displacement of the piston inside the cylinder from Top Dead Center (TDC) to the Bottom Dead Center (BDC) in the engine’s one complete cycle.

The Displacement of any “reciprocating piston engine” is calculated by multiplying these three values.

  1. Distance traveled by the piston (stroke length)
  2. Circular area of the cylinder (bore)
  3. Number of cylinders that comprise the whole engine.
Mathematical formula of engine displacement :

V = π/4 x (D)² x H x N

 V = Engine Displacement

 D = Bore Diameter

 H = Stroke Length  

N = No. of Cylinders

For more detail watch this video :

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