Technician A says that valve overlap is the number of crankshaft degrees that both valves are closed. Technician B says that valve overlap is the number of degrees that both valves are open. Who is right?

Question

Quizplus · Accepted Answer

Valve overlap refers to the period during the engine's cycle when both the intake and exhaust valves are open at the same time. This occurs near the end of the exhaust stroke and the beginning of the intake stroke. Technician B is correct.

Technician a Says That Valve Overlap Is the Number of Crankshaft