The term ENGINE ELEMENTS can be broken down into four crossword solutions: CAMS (4 letters). CAMS stands for Camshafts, which are a rotating shaft that is used to open and close the valves in an internal combustion engine. The camshaft is driven by the crankshaft, and it is responsible for controlling the timing of the intake and exhaust valves. Camshafts are essential components of any engine, as they are responsible for controlling the air-fuel mixture and the timing of the spark plug.