Which of the following represents the diesel engine camshaft shown in the illustration and its relative rotating speed? Illustration MO-0122

Correct Answer: Option B — "B" is the camshaft and its rpm will match that of the flywheel.

In specific medium-speed engine designs referenced, the designated camshaft rotates at engine crankshaft speed, directly matching the rotational frequency of the flywheel to maintain proper valve and fuel injection timing intervals.