Technician A says that the intake valve runs hotter than the exhaust valve because the intake valve has the greater surface area. Technician B says that the exhaust valves usually do not burn due to the scavenging effect of the exhaust stream. Who is right?

Question

Quizplus · Accepted Answer

The exhaust valve runs hotter than the intake valve because it is exposed to hot exhaust gases, not because of surface area. Exhaust valves can burn if they do not seat properly or if there is a lean air-fuel mixture, despite the scavenging effect.

Technician a Says That the Intake Valve Runs Hotter Than