At approximately how many revolutions per minute must the starter motor rotate to start the combustion engine?

Question

DentroTest · Accepted Answer

The starter motor is a small electric motor powered by the battery whose sole function is to overcome the initial mechanical resistance of the thermal engine. To achieve the first combustions and get the main engine running on its own, high speeds are not necessary. The required rotation speed generally ranges between 60 and 100 rpm. Therefore, 70 rpm is the correct answer. Figures like 500 or 1550 rpm are too high for a starter motor and correspond to engine speeds when it is already running (idling or driving).

At approximately how many revolutions per minute must the starter motor rotate to start the combustion engine?

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