Neu Motor Running Hot
 

Running a Neu 1512 2.5D on a Losi 8ight geared at 14T/46T (44mph calculator) with 5S 5000mah 25C/50C batteries and MMM ESC. Batteries are only around the 95F - 112F and MMM is 100F - 125F (measuring through the gaps for the heat sink) and the motor gets up to 145F - 165F (it is currently winter here in Australia although no snow etc. still warmish). I am running standard diff fluids for the Losi 8ight Roller F - 3000 C -5000 R - 2000 and measuring it with the Duratrax Temp Gauge. I read on here in the FAQ section that usually when just the motor is hot it is undergeared but wouldn't really think you would need to gear for more than 44mph. Can changing the diff fluid here at all?

I would gear up. Maybe I am putting something wrong in the calc but with 14/46 gearing a 1650kv motor and 18.5v I am only coming up with 36mph.

I ran a 1512 3d(1700kv) in my 8 and believe I was running 17/44.

1512 2.5D is 2050KV
http://www.neumotors.com/20061222/1500_series_.html

I'd honestly try gearing down first. If that doesn't help then go up.

DRIFT - this is sounding very much like the same problem I am having with my buggy that I just posted about.
http://www.rc-monster.com/forum/showthread.php?t=13040

What tires are you running? I noticed my problem seemed to be worse when running the Moab 1/8 buggy tires compared with others - there seems to be a 0.5" ballooning effect going on with these tires which will throw the overall gearing off when at WOT.

Also - where and how are you running? Are you racing on a track or bashing around in parking lots/dirt/grass fields?

sorry I was thinking 1515 2.5d

Those are normal temps, that is what I have been getting for the last two years and my motor runs great. I race every weekend all year round.

My concern is not about 165*, it is when I see the temps going over 170 and climbing up to 180. I don't want to risk demagging a $250 motor.

Those are not bad temps. I would put heavier diff fluid in the center maybe, like 7k or 10k (I like 10K in mine).

I get 170 -180 on my Feigao 8XL all the time. And it's been running like a champ for over two years. I think you will be ok with 145 - 165 temps on your Neu.

Yes, but what will he do when the weather starts getting warmer? He said it was winter. I would have to agree and say you should gear down, and if that doesn't make it better than gear up a bit. But I agree, I would never run a neu motor if its getting that hot all the time, to much money to risk.

Check your timming setting on your ESC.

On a "d" wound motor, your timming should not be higher than 10 degre. 0-5 is the best. Higher and it'll heat up.
On a "y" wound motor, you could go over 10 degre

David

David

do you know the theory behind that is? this is the first time I have heard it and I am curious.......

Not sure where you are running your car, but those temps are pretty consistent for a Neu under race conditions. Nothing to worry about at all.
You can play with the gearing and check the timing settings on the MMM to see if you can shave some a few degrees off, but those temps are more than acceptable. I keep all mine set to lowest and everything runs great. I pretty much average out about 140-165ish after a hard race. Once you start getting up to 180+ you shoudl be really concerned. I believe the official danger zone is 200+ degrees.

Recommended by Neu (from another forum I believe), as I have heard this as well. Also the instruction sheet that comes with the Neu motors (you do read the instructions right?) says low timing.