In a complete four-stroke cycle, how many crankshaft degrees are required to complete all four strokes?

Study for the Automotive Service Technician (310S) Engines Exam. Explore multiple choice questions with hints and explanations to prepare effectively for your exam! Get ready to excel in your automotive career!

Multiple Choice

In a complete four-stroke cycle, how many crankshaft degrees are required to complete all four strokes?

Explanation:
A complete four-stroke cycle requires two full crankshaft revolutions. Each stroke—intake, compression, power, and exhaust—takes 180 degrees of crankshaft rotation, so four strokes add up to 4 × 180 = 720 degrees. That means the entire cycle spans 720 crankshaft degrees, or two turns of the crank. The other options correspond to only partial rotation: 360 degrees is one full turn, not enough for all four strokes; 180 degrees is just one stroke; 540 degrees is 1.5 turns, still not the full cycle.

A complete four-stroke cycle requires two full crankshaft revolutions. Each stroke—intake, compression, power, and exhaust—takes 180 degrees of crankshaft rotation, so four strokes add up to 4 × 180 = 720 degrees. That means the entire cycle spans 720 crankshaft degrees, or two turns of the crank. The other options correspond to only partial rotation: 360 degrees is one full turn, not enough for all four strokes; 180 degrees is just one stroke; 540 degrees is 1.5 turns, still not the full cycle.

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