Technology / Motorcycle / Pushrods: Pushrods are used to connect to rocker arm assemblies which, in turn, open and close valves. In this case, the Camshaft is located near the crankshaft. The rotation of the camshaft causes its lobes to press upward on the Pushrods which extend to the top of the engine and connect to the rocker arms. Harley-Davidson motorcycles are heavy users of the pushrod method of valve operation.


Technology / Motorcycle / Camshaft: A metal shaft with two or more cams (oval "lobes") that rotates to operate inlet and/or exhaust valves in a four-stroke engine. MORE

Overhead Valve (OHV)

Technology / Motorcycle / Overhead Valve (OHV): A type of piston engine that places the camshaft in the cylinder block and uses pushrods or rods to actuate rocker arms above the cylinder head to actuate the valves. Lifters or tappets reside in the MORE

Overhead Camshaft (OHC)

Technology / Motorcycle / Overhead Camshaft (OHC): A camshaft in an internal-combustion engine that is mounted within the cylinder heads, above the combustion chambers, and drives the valves or lifters directly instead of using pushrods. MORE