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The crankshaft is turned by the pistons going up and down. The cam shaft is driven by the timing belt or chain that is turned by the crank shaft. The camshaft on a four cycle engine turns 2 to 1 crankshaft revolution. The cams on the camshaft operate the intake and exhaust valves. intake valve on one revolution and exhaust on the next.

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Q: Is a camshaft the same thing as a crankshaft?
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