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Old 12-24-2007, 06:04 AM   #1
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Questions?? Why is my ESC so hot??

Hi guys,
I'm running a novak 6.5 with bonded rotor, spek micro receiver, average non-digital servo and 4200 matched saddle packs with an LRP Sphere (oldest model) on my BJ4WE that I got this week; but my ESC is getting really hot. After a couple of mins it is too hot to touch (about 70 degrees celcius) and is hotter than the motor by about 10 degrees.
Now you know all the details, would you have any idea as to what the problem would be?
Any questions are welcome also.

EDIT: LOL I just realised the mistake I made on the title, and I can't change it! I feel so dumb.

Thanks.

Last edited by stickman310; 12-24-2007 at 02:23 PM.
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Old 12-24-2007, 07:20 AM   #2
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The motor and the esc just get hot when you're running 4wd, not sure if there is a man scientific reason behind it. Not a ton of air flow and it has to push a ton of current through it. Make sure you have a fan and some vent holes in the front of your body so that it can get some air.
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Old 12-24-2007, 07:40 AM   #3
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I ran that exact combo in my V2pro for a while and found that the only way to keep it cool was to put the fan kit on. I think they call it the worlds kit or something its a special heatsink that mounts a fan. Try dropping a tooth or two as well. Mine never got that hot even without the fan. Now that I am using the fan even after a 6 or 7 min run the speedo is just barely above room temperature.
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Old 12-24-2007, 02:18 PM   #4
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Oh I forgot to add that my gearing is 15/78, an fdr of 13. It is recommended to use an fdr of just 10 with the 6.5 in the BJ4WE but with my hot climate here in Australia, I needed to drop heaps of teeth.
I think I must just need the fan and I should be fine
Thanks for the help everyone.
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Old 12-24-2007, 02:28 PM   #5
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Quote:
Originally Posted by stickman310 View Post
Oh I forgot to add that my gearing is 15/78, an fdr of 13. It is recommended to use an fdr of just 10 with the 6.5 in the BJ4WE but with my hot climate here in Australia, I needed to drop heaps of teeth.
I think I must just need the fan and I should be fine
Thanks for the help everyone.
i got a 6.5 sintored rotor in mine and im at a 22, and could easily go to a 23 if i needed to.... id try gearing up a little bit and put 2 holes in the front of the body so you can get some air flow as well....
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Old 12-24-2007, 11:02 PM   #6
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Brushless works way way different than brushed motors. I would put the correct gearing on the first place, then race it and check on the heat. With brushless if you go to low on the pinion, you can make it run hottter that way. The guys at where I race always say, remember its not a brushed motor, and the way things work, i.e. motor gets hot drop pinion teeth, doesn't not work the same on the brushless.

Instead of dropping, got higher.
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