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360 degrees of crankshaft rotation for a piston to move from tdc to bdc and return to tdc.

The crankshaft must rotate fully twice (or 720 degrees) in a four-stroke cycle to complete an engine cycle, spinning 360 degrees each time the piston moves from TDC to BDC and back. The engine completes this reciprocation about 125 times per second in a car with a redline of roughly 7500 rpm.

A timing belt or chain is used to connect key engine components together and maintain everything in synchronization in order to hold this incredibly precise sequence of actions together. A thick, toothed belt called a timing belt wraps around the crankshaft, water pump, and camshaft sprockets, spinning in time with the crankshaft at the base of the engine block.

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