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OHV: OverHead Valve - an engine design where the camshaft is installed inside the engine block and valves are operated through lifters, pushrods (Reason why OHV engine are also known as "Pushrod" engine(s)) and rocker arms .
| An OHV engine is very simple, has more compact size and proven to be durable.
Downsides: it's difficult to precisely control the valve timing at high rpm due to higher inertia caused by larger amount of valve train components (lifter-pushrod-rocker arm). Also it's very difficult to install more than 2 valves per cylinder or implement some latest technologies such as Variable Valve Timing - something that could be easily done in a DOHC engine. | |
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