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Dec 23, 2011, 09:34 PM
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Brushless Motor Hot


Hi, I have an rc10t4 with an aftermarket brushless setup. The speed control is 100 amp and never gets hot. I run 3s and 5s lipo. Batteries never get hot. But the motor gets extremely hot. The motor is an xl 3600, I bought from rcmonster. I'm thinking it's gearing. Pinion is 17t and the main gear is stock (think it's 87t) What do you guys think? !
Last edited by frankiexp; Dec 23, 2011 at 10:46 PM.
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Dec 24, 2011, 12:24 PM
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yes you need to go down on the spur
Dec 24, 2011, 12:27 PM
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Originally Posted by Gixxer600
yes you need to go down on the spur
I went from 18 to 15, still too hot. Do you think 12??
Dec 24, 2011, 01:20 PM
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ummm, I really don't know see I run 1/8th scale and with my MBX5T I run 15-16/46 both no problems...You have quite a big spur there..I would go down say 13 maybe 12 if you have em...
Dec 24, 2011, 02:42 PM
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will try 12. Should I think of changing spur? Also will running more volts help? Not joking, just thinking motor would be stronger. I don't remember motor running this hot on 5s.
Dec 24, 2011, 04:20 PM
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hmm...I would go lower on the spur def if you could...Also I know with higher volt lipos and lower kv motors it runs more cooler
Dec 24, 2011, 04:22 PM
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The easiest thing to change is the pinion so why not start there? Go down a couple teeth on that and see what happens.

Going up on voltage should make things worse... your motor is based on rpms/volt so increasing voltage would be increasing rpms and it sounds like it's working too hard already. motors will typically work better on more volts if you design the system properly. For instance, if your vehicle is designed for a 3500kv motor on 3S then going to a 1700kv motor on 6S works well. A lot of guys are doing this on 450 size helis with great results.
Dec 24, 2011, 07:57 PM
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Not really...Depends on the kv his motor has...a higher voltage low kv set up runs cooler due to efficiency. Also he already stated that he has changed to pinion twice
Dec 24, 2011, 09:29 PM
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Quote:
Originally Posted by Gixxer600
Not really...Depends on the kv his motor has...a higher voltage low kv set up runs cooler due to efficiency. Also he already stated that he has changed to pinion twice
Sorry, maybe I'm lost but are you guys referring to the pinion gear as the same as the spur gear?

Don't get the first part of the statement at all though, I've already stated that higher voltage with lower kv is better...
Dec 25, 2011, 02:19 AM
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Let's just clarify a bit.. pinion gear is the smaller one you put on the motor, spur is the larger one which is part of the drive train.

Let's see... the RC10T4 has an internal ratio of 2.6, and you're running 17/87

Which means your FDR is around 13.3. Would you please specify what KV/Turns your motor is? Would help a lot in determining what changes are best for you.
Dec 25, 2011, 11:58 AM
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Originally Posted by SporadicIdiocy
Let's just clarify a bit.. pinion gear is the smaller one you put on the motor, spur is the larger one which is part of the drive train.

Let's see... the RC10T4 has an internal ratio of 2.6, and you're running 17/87

Which means your FDR is around 13.3. Would you please specify what KV/Turns your motor is? Would help a lot in determining what changes are best for you.
It's an xl 3600 brushless motor. 97 amp / 1300 watt. Hope this helps!
Last edited by frankiexp; Dec 25, 2011 at 12:07 PM.
Dec 28, 2011, 08:04 AM
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3600kv with 5s is a recipe for disaster... If the motor is hot, it's over geared for the voltage you're running. 3s is the highest voltage I would go with with 3600kv, but even that is way more power than you need unless you're running in a big parking lot.

I would go down in size with the pinion and/or up in size with the spur until temperature are more in check, or run it on 2s.
Jun 17, 2019, 06:33 AM
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new motor


im getting a castle sensored brushless motor today says it can run a 2s-6s batterys would getting a 4s battery make my traxxas go faster or would it cause it to heat up the motor to quickly?


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