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Expected start motor torque

  1. Jul 25, 2013 #1
    What is expected in stall torque from a regular car/small tractor starter motor?

    I measured 7-9 Nm on a starter motor I had lying around, and I'm not sure if this motor is crappy or if such performance is expected.
    It was fed with 12V battery and parallelled with a battery booster (basically a transformer with 12V ouput). I couldn't measure the current, but the boosters 40A current indicator looked like it was going to hurl its pointer through the glass.

    The reason I ask is because if it seems to have a reasonable stall torque it will propel an electric motorcycle.
  2. jcsd
  3. Jul 25, 2013 #2
  4. Jul 25, 2013 #3
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