How many degrees complete a full cam rotation?

A full rotation of a cam corresponds to a complete 360-degree turn. This is because a cam operates by converting rotary motion into linear motion, and a full circle, by definition, consists of 360 degrees. This is fundamental in understanding cam profiles and timing in engines, as the motion imparted by the camshaft is crucial for the functioning of engine valves and other components.

The other choices represent incomplete rotations. A 720-degree rotation indicates two full turns, which exceeds the requirement for a single full cycle of operation for most cam applications. A 180-degree rotation signifies a half turn, which does not account for the complete cycle needed for a full stroke in mechanical systems. Lastly, a 90-degree rotation represents a quarter turn, which again fails to encompass the entire movement needed to complete the desired motion in cam mechanisms. Understanding this distinction is vital for diagnosing and working on engine timing and cam profiles effectively.