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rev limiter
A rev limiter is a device fitted to an internal combustion engine to restrict its maximum rotational speed. Rev limiters are pre-programmed into the car's Engine Control Unit, except aftermarket units, which are packaged as a separate micro-controller. Cars need a limiter because it prevents the engine from operating above a pre-determined RPM level known as the redline. If an engine goes over the redline, commonly called "Over-Revving", damage to the engine and valve train may occur because it can cause the valve to stay open longer than usual. Valve float can possibly result in loss of compression, misfire, or a valve and piston contacting each other.
== Operation ==
Limiters usually work by cutting off a necessary component needed for the combustion processes, although some will change ignition timing. Commonly, rev limiters control the spark or the fuel injectors to the engine.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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