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A Tachometer consists of a red zone at high rpm markings. What happens actually after that limit?

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Upto the beginning of the ‘Red Line’, an ICE can rev safely/repeatedly without any internal damage. If revved beyond/into the Red Zone, it stands to get damaged due to inadequate Lubrication/Cooling and therefore, Mechanical/Electrical ‘Speed Governors’ are provided in the engine management system to prevent such a mishap.

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