Question

In which step of the four-stroke engine cycle does the spark plug initiate the combustion reaction?

Answer 1

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

Step-by-step 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).

Answer 2

ANSWER
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.