Combustion stroke is the step at which four-stroke engine cycle sparks plug initiate the combustion reaction.
<h3>Explanation:</h3>
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).
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.
