Device used in the ignition system to limit the rotations per minute (RPM) or engine speed.

Device used in the ignition system to limit the rotations per minute (RPM) or engine speed. In newer electronically controlled powertrains, this can be done through programming of the powertrain control unit/module (PCU/PCM). The RPM is preset and will not allow the engine to go past this point. One way it can limit this by cutting the spark output to certain cylinders at certain times, which will not allow the engine to rev any higher. This helps protect the engine from accidental damage caused from stresses it was not intended to withstand.

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