It is an abbreviation for Double Overhead Camshaft. This means that the engine has separate camshafts for the operation of the intake and exhaust valves.

What is Camshaft? The camshaft is a shaft that rotates together with the engine. This is broken down by a series of "cams" or lobes

What is Camshaft? That activates each cylinder's intake and exhaust valves at exactly the time they should open and close.

What is Camshaft? All combination gases from an explosion must be captured inside a sealed container cylinder for an internal combustion engine.

What is Camshaft? These expanding gases propel a piston, which rotates the engine's crankshaft.

What does DOHC mean? It is an abbreviation for Double Overhead Camshaft. This means that the engine has separate camshafts for the operation of the intake and exhaust valves.

What does DOHC mean? The series of rocker arms that extend from the single camshaft out to either the exhaust or intake side of the cylinder bank is the Achilles heel of a SOHC engine

What does DOHC mean? The arms of this rocker resemble miniature see-saws. When the corresponding camshaft lobe lifts one end, the other end presses the valve open.

What does DOHC mean? Cam lobes, on the other hand, create friction each time they pass through the rocker's arm. Thus the top speed of the SOHC engine is limited.

What does DOHC mean? Automobile manufacturers pioneered DOHC for early race car engines to achieve higher-revving and more efficient powerplants.