In a four-stroke diesel engine, the camshaft is geared to run at what speed relative to the crankshaft?

A. The same speed as the crankshaft
✓ Half the crankshaft speedCorrect
C. Twice the crankshaft speed
D. One-quarter the crankshaft speed

Why B is correct

In a four-stroke cycle the camshaft must open each valve once every two crankshaft revolutions, so it is geared to run at half crankshaft speed. DOE-HDBK-1018 Vol.1 §1-1 states this directly.

Cited:DOE-HDBK-1018 Vol.1 §1-1

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In a four-stroke diesel engine, the camshaft is geared to run at wh… — USCG Exam Practice · CaptainsGround