OHC means overhead cam. The cam is above the cylinder head. SOHC engines have a single cam over the cylinder head. DOHC engines have two cams above the cylinder head. All OHC, SOHC, and DOHC engines are also OHV.
It is a type of valvetrain configuration in which the camshaft of the engine is in its cylinder head. When the camshaft is located close to the valves, the engine runs at higher rpm. In a single-overhead-cam (SOHC) layout, one camshaft activates all the valves in a cylinder head while in a double-overhead-camshaft (DOHC) layout, one camshaft actuates the intake valves, and the other operates the exhaust valves.
A camshaft used for operating both valves and unit injectors, located on top of or within the cylinder head. Such camshafts are driven by a multi-gear geartrain off the crankshaft. They simplify the design of the cylinder head and eliminate pushrods, allowing for much larger, open intake and exhaust ports and better breathing.
An overhead valve engine with the Camshaft in the head. Not seen until the 1970s on tractors.
This really refers to the camshaft, or the rotating shaft covered in bumps - or cams - that open and close an engine's inlet and exhaust valves. Older style engines had their camshaft built into the block of the engine, from where the valves were operated by pushrods. Placing them in the cylinder heads, or "overhead" is a more efficient method of valve operation. If there's two, you've got a double overhead camshaft or DOHC. Some car makers claim to have quad camshafts, but this is identical to a dual overhead camshaft set-up, but across both banks of a V-shaped engine, allowing marketing departments to promote the fact it has four camshafts.
A camshaft located above the cylinder head rather than below the cylinders in the engine block. Overhead camshafts eliminate the need for push rods to activate the valves. DOHC engines have double (two) overhead camshafts. One operates the intake valves, and the other operates the exhaust valves.
The type of valve train arrangement in which the engine's camshaft is mounted above the cylinder head(s). When the camshaft is placed close to the valves, the valve train components can be stiffer and lighter, allowing the valves to open and close more rapidly and the engine to run at a higher RPM. In a single overhead cam (SOHC) layout, one camshaft actuates all of the valves in a cylinder head. In a dual overhead camshaft (DOHC) layout, one camshaft actuates the intake valves, and one camshaft operates the exhaust valves.
The camshaft is on top of the cylinder head on overhead-cam engines. Single overhead-cam (SOHC) engines have a single cam above the cylinder head. Dual overhead-cam (DOHC) engines have two cams above the cylinder head.
A term used for overhead camshaft or overhead camshaft engines.