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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 camshaft and magneto were driven by the crankshaft through a three-member train of spur gears (see Figures 9, 10 and 11). The Wright Brothers' Engines and Their Design Leonard S. Hobbs. The cam-shaft is hollow, and serves as a channel for the conveyance of lubricating oil to each of the camshaft bearings.