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Old 07-23-2010, 11:47 AM   #29 (permalink)
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Originally Posted by RobertSmalls View Post
But it's 200A to START a cold engine, not to keep a hot engine spinning at 500RPM. Maybe a better place to start with this math would be to measure engine braking on flat land in low gear, or to consider your gph in neutral at 2000 RPM.
Don't forget that a starter is a high-torque low-efficiency device as well; most of that 200 amps goes to heat, which is why you burn up the starter if you run it for more than a couple of minutes at a time.

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