Both of the following cams have intake and exhaust lobes of identical lift and duration. Which has more overlap, the camshaft with lobe centers at 112° or the camshaft with lobe centers at 114°?
A)112°
B)114°

Question

Quizplus · Accepted Answer

The camshaft with lobe centers at 112° has more overlap. Overlap refers to the period during which both the intake and exhaust valves are open at the same time. A smaller lobe separation angle (112° vs. 114°) results in greater overlap because the intake and exhaust lobes are closer together, causing the intake and exhaust valves to be open simultaneously for a longer period.

Both of the Following Cams Have Intake and Exhaust Lobes