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What is an engine ‘camshaft’ and what does it do?

May 26th, 2009
A camshaft or ‘bumpstick’ as it has been known as in the automtive field is a shaft with eccentric lobes on it. The camshft is driven by a chain, gears or a timing belt and the eccentric lobes move the valves in the head up and down in the proper sequence.   Some engines use pushrods [...]