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This refers to the upward or downward movement of the piston in an engine. If we want to calculate the capacity (size) of the engine, we need to measure the length of the stroke.

For example, in a four stroke engine, it takes four strokes (upward or downward movements of the piston) for the engine to complete one cycle of operation:

  1. Induction Stroke - a downward movement of the piston.
  2. Compression - an upward movement of the piston.
  3. Power - a downward movement of the piston.
  4. Exhaust - an upward movement of the piston.

In a four stroke engine, only one stroke, the power stroke, produces power. The other 3 are known as Idle strokes.

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