This means that all OHC engines are technically OHV engines, but not all OHV engines are OHC engines. What’s the difference between an OHV and an OHC engine? Technically, an overhead camshaft (OHC) engine also has overhead valves, however to avoid confusion, OHC engines are not usually described as overhead valve engines. The motion of the camshaft is transferred using pushrods and rocker arms to operate the valves at the top of the engine. The camshaft in an OHV engine is located in the engine block. Where are the overhead valves located in an OHV engine? maintainance is easier, no cam belt to change just the cam chain at extended intervals. Push rod engines are usually lower revving, and strangely more reliable because with overhead cam most of them are run by belt, which to my mind is a weakness in the engine. Secondly, pushrod engines are downright simple. At low rpm, when the airflow is more restricted, having only two valves for air to flow through speeds up the flow of the intake air. That’s because pushrod engines typically use two valves per cylinder, which improves air velocity. Usually, one cylinder makes two strokes while the other makes four strokes, giving six piston movements per cycle. The term six-stroke engine has been applied to a number of alternative internal combustion engine designs that attempt to improve on traditional two-stroke and four-stroke engines.
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