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Old 04-21-2003, 03:10 AM   #1
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Join Date: Feb 2003
Location: Auckland, New Zealand
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Gearing help

If my motor overheats quickly in a run, then does that mean I should decrease the difference of the spur+pinion? For eg. if motor overheats with a 19t pinion and 61t spur, would a 20t pinion and a 58t spur make it cooler. Or would it overheat more?
I'm confused
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Old 04-21-2003, 03:35 AM   #2
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Location: Bristol, UK
Posts: 3,809

Using the difference between a spur and pinion as a guide will be very confusing, and innacurate.

What matters is the gear ratio.

If your motor is running too hot, you normally need to lower the gear ratio. You can do this by fitting either a larger spur or a smaller pinion. Sometimes, an under-geared motor will run hot, so you can raise the gear ratio by fitting a smaller spur or a larger pinion.

In your example, 20/58 is a higher ratio than 19/61, and will probably make the motor run hotter.
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