|
Perhaps because a starter motor spins the engine at aprox. 200rpm during cranking. Don't expect it will last long at 9000rpm, lol - - - Obviously a differential gearing system would need to be employed.
Years ago, cars used to use a device called a generator, which looked just like a starter motor. However the alternator became the chosen device because it was far superior in terms of output and efficiency.
__________________
|