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Power stroke

EXPLANATION

At the power stroke stage, the piston is forced to move down by the expanding gases as both intake valve and exhaust valve are closed.
A spark from the spark plug contributes to ignition of the compressed fuel air mixture to released energy to perform work.
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Answer:

Combustion stroke is the step at which four-stroke engine cycle sparks plug initiate the combustion reaction.

Explanation:

  • Combustion or ignition is known as the burning of fuel in the presence of air.
  • Combustion stroke is the third stroke in four-stroke engine .
  • In this stroke the compressed air-fuel mixture is sparked by a spark plug (in a gasoline engine) and by heat generated by high compression (diesel engines).

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