Posted by David - OR on April 02, 2009 at 09:00:24 from (208.67.204.213):
In Reply to: Re: 6 Volt vs 12 Volt posted by buickanddeere on April 02, 2009 at 07:05:54:
If the starter spins the engine twice as fast, it is delivering twice the power. Not 4x the power.
I said (and you quoted) that I expected the current to be about the same (when spun at 2xRPM) at 12 volts as the starter drew at X rpm at 6 volts. Thus the input power would be double (not 4x). Back EMF increases with increasing RPM, limiting the current.
With the starter STALLED the starter delivers no power but consumes 4x the power at 12 volts as at 6 volts.
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