When are exhaust valves exposed to the most heat?
A) When closed at the end of the power stroke.
B) When opened at the end of the power stroke.
C) Immediately after the engine is shut off.
D) During the exhaust stroke.

Question

Quizplus · Accepted Answer

Exhaust valves are exposed to the most heat when they open at the end of the power stroke because this is when the hot gases from the combustion process are released directly past the valve.

When Are Exhaust Valves Exposed to the Most Heat