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Old 09-06-2008, 05:51 AM   #1
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Default BRUSHED MOTOR IS HOT???????

I have a 19t Komodo brushed motor in a xxx-t mf2 and it is getting hot. A guy at the the track had a temp gun and it was at 173 degrees. I am running a stock spur gear and a 20 tooth pinion. What should this truck be geared. Also the esc is cool as can be.
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Old 09-06-2008, 06:25 AM   #2
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after a five min run it should be 165 to 180 so your good if it gets hotter drop your pinion
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Old 09-06-2008, 06:28 AM   #3
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I would try to keep that motor at around 150*F. If it gets to hot you can tell by the motors performance later on.
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Old 09-06-2008, 07:25 AM   #4
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I would drop your pinion down till you are about 150 to 160. You will burn the motor up. My wife races stock motors in her T4. She is around 14 to about 16 tooth pinion
with a 87 tooth spur gear. if that helps you out a bit.
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Old 09-06-2008, 07:35 AM   #5
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Quote:
Originally Posted by ghj1997 View Post
I have a 19t Komodo brushed motor in a xxx-t mf2 and it is getting hot. A guy at the the track had a temp gun and it was at 173 degrees. I am running a stock spur gear and a 20 tooth pinion. What should this truck be geared. Also the esc is cool as can be.
There is no set in stone gearing rule. Every motor, even the same type and same brand, varies in the proper gearing. It sounds as if your on the high side of the acceptable temp scale, so maybe consider dropping a couple of teeth on the pinion. But look at the brushes first, if they're all black and burnt looking you need to drop some teeth. If they look new you're fine.
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Old 09-06-2008, 11:02 AM   #6
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I generally run 20/88 in my MF2 with a Komodo Dragon 19T using reedy 767 brushes. The reedy brushes give more torque than the E brushes that the motor comes with. They also last longer. The motor comes off pretty warm but not excessively hot after 5 minutes. Use 19/86 gearing with the stock trinity E brushes.
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Old 09-06-2008, 01:10 PM   #7
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Was this temp reading taken after a whole battery pack during practice?
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Old 09-06-2008, 03:48 PM   #8
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yes. I ran for about 7-9 minutes
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Old 09-06-2008, 03:54 PM   #9
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Only run for 5 minutes at a time! Brushed motors like the komodo dragon after 5 minutes of runtime get too hot when geared for maximum performance.
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Old 09-07-2008, 02:10 AM   #10
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I would say it's a little too hot at 173 deg... but that could have been from running it for more than 5 or 6 min. I generally try to run my practices just as I would race. I try to keep my brushed motors at around 150 degrees... if you are pushing 170, you will probably burn up brushes quickly and then damage might be done to the comm as well...

Also consider your tires too.. Where you getting the correct traction too?

Just some things to thing about..


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Old 09-07-2008, 09:08 AM   #11
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GHJ-The reason the esc is cool and the motor is HOT is do to all the switching being done inside the motor UNLIKE brushless where the switching is done in the esc.

Your geared right or within 1-2 and after 7-9 minutes thats about how hot it will be.
Most tracks race 5-6 minutes and thats the maximum you should run that motor if you wanted it to last as a good race motor.
What I had taught alot of people to do is have 2 motor's. 1 as a practice motor that you can abuse and never really worry about it. When done with praciticing go to your race motor so it never goes over a certain time limit in which it will stay in better condition longer.

Reedy 767 brushes are a great brush for that motor.
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Old 09-07-2008, 10:38 AM   #12
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I personally would go up to the next size (bigger) spur gear. Leave the pinion alone. But thats my opinion.
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