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Does the tachometer on a car measure crankshaft rpm or engine rpm considering that the crankshaft rotates twice for each full cycle of the engine in a four stroke engine?


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2007-07-07 19:47:12
2007-07-07 19:47:12

The tachometer is an electrical device that senses the ignition system. It indicates engine RPM (revolutions per minute). Engine rpm and crankshaft rpm are two ways of expressing the same thing. True, the crankshaft does rotate twice for each complete set of cylinder firings but the tachometer counts each rotation.

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crankshaft The crankshaft rotates. A torsion bar twists.

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An automotive engine's camshaft rotates at A. the same speed as the crankshaft. B. one-quarter the speed of the crankshaft. C. one-half the speed of the crankshaft. D. twice the speed of the crankshaft.

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The engine's camshaft rotates at half the speed of the crankshaft. The crankshaft turns two full turns for every one full turn of the camshaft.

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There is a crankshaft position sensor that measures how fast it rotates

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One half the speed of the crankshaft.


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