View Full Version : What Gearing for this Motor?
01-06-2004, 02:13 AM
What would be a good gearing for a P2K2 Pro Dyno Tuned Motor?
Pinion = ?
Spur = ?
I want a gearing that will make the motor last and keep the heat down.
01-06-2004, 07:06 AM
The answer was found in the FAQ. (http://monster.traxxas.com/showthread.php?s=&threadid=110579)
Question: How should I gear my motor?
Answer: As a general rule of thumb, you want a pinion gear that is 2 teeth less than the turns on the motor. For example, if you have a 17T motor you'll want to start with 15/87 gearing. If the motor and ESC aren't running too hot, you can go up a tooth at a time on the pinion to get more speed. Running in grass makes the motor work a lot harder, so if you primarily run in your back yard, drop a couple of teeth on the pinion. Your motor and batteries will thank you. If you are using a stock 27T 24° racing motor (like a P2K, or MVP), you'll want to use a 15 or 16 tooth pinion.
In review, that's a 15 or 16 tooth pinion with an 87 tooth spur.
01-06-2004, 07:18 AM
I haven't experimented much with stock motors. Tosses the "two teeth less than turns" rule-of-thumb out the window huh?
01-06-2004, 07:48 AM
A stock racing motor geared 25/87 wouldn't last too long, after all, there always has to be an exception to the rule. :)
A Stock racing motor needs to be geared low for "bashing around" because they tend to run hot. They are designed to sacrifice efficiency for more RPM/power, and in a racing situation, they only need to run for 5 minutes. You can actually gear up a few teeth from the recommendation, but you will have to stop to let the motor cool off before a typical battery is spent.
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