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A camshaft is the element of an internal combustion engine the purpose of which is to open and close the valves.orking in conjunction with the crankshaft, the camshaft rotates at half the speed of the crankshaft in a 4-stroke engine cycle and at the same speed in a 2-stroke engine.
The cam shaft has lobs on it which are egg shaped and they rub against the top of the valve and when the egg shaped part of the lob rubs on the top of the valve it opens it up and allows the air to enter the engine and the same thing happens for the exhaust valve.est Answer: the cam shaft rotates and it makes the pistons go up and down in order for the proper combustion cycle. if the cam shaft is broken the car will not run. they usually do not break but wear down from usage or bend. Source(s): overhaulin' and spike power block. Steven J Â· 7 years ago. Thumbs up.