Camshaft or OHV, SOHC, or DOHC for short, is a component that opens inlet and outlet valves in four-stroke internal combustion engines. The inlet valves are the same as the fuel and air inlet valves into the cylinder. Exhaust valves are the same as exhaust valves from the cylinder. The name of the camshaft refers to the cams on this piece. This piece consists of a metal cylinder as the main axis on which there are axes in the form of ellipses or non-axial circles
Camshaft
In some two-stroke models, a valve stem is used for the outlet valve
The valve stem is rotated by a gear that is connected to the crankshaft by a chain or timing belt. In four-stroke engines, one valve rotates one turn for every two turns of the crankshaft
Factors that can damage the camshaft include a drop in oil pressure or a lack of oil in the engine
In the years before the 1980s, most engines usually had a camshaft inside the cylinder, and the force was transmitted to a finger or a pin and then to the valve through typet, and typet rod
Today, in most four-stroke engines, there is a camshaft on the cylinder head, which is called an overhead camshaft. Engines with one overhead valve are known by the term OHC and engines with two valves of this type are known by the term DOHC
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