Louisiana FFA CDE Small Motor Practice Test

Question: 1 / 400

In a four-stroke cycle single cylinder engine, how many power strokes occur for every four revolutions of the camshaft?

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In a four-stroke cycle single cylinder engine, the engine completes one power stroke for every two revolutions of the crankshaft. Since the camshaft is driven by the crankshaft at half the speed, it completes one full revolution for every two revolutions of the crankshaft. Therefore, in four revolutions of the camshaft, the crankshaft would have completed eight revolutions. This results in a total of four power strokes, but since you are observing the camshaft's revolutions, you would note that only one power stroke occurs for every four revolutions of the camshaft. Thus, the relationship indicates that the correct answer reflects the one power stroke produced during this set of revolutions.

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