The camshaft is a shaft with a series of eccentrics (lobes) along its centerline in various positions designed to open intake and exhaust valves in time with crankshaft and piston timing events. Springs are there to close the valves. ... The four cycles are intake, compression, ignition/power, and exhaust stroke.

What is a cam shaft used for?

A camshaft acts as a timing device that controls the opening and closing of the intake and exhaust valves, as well as setting the valve overlap that occurs at the top dead centre on the exhaust stroke. The shaft is constructed with several journals that ride on bearings within the engine.

What are the parts of cam shaft?