Camshaft
A shaft with Cam lobes (bumps) which is driven by gears, a belt, or a Chain from the crankshaft. The lobes push on the Valve lifters to cause the valves to open and close. The camshaft turns at half the speed of the crankshaft.
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Not to be able to stop thinking is a dreadful affliction, but we don't realize this because almost everybody is suffering from it, so it is considered normal.
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