kuzo

iTrader: (11)

Since I've been running long runs with lipo I want to make sure I'm not getting too hot.
What is considered to be the highest safe temp for Novak brushless motors?
I have both sintered and resin rotors and I know the sintered can handle higher heat. I'm looking for the same safe limit for the ESC.

UN4RACING

iTrader: (22)

Hey kuzo, Novak GTB 4300. In 20 minute mains 129 degrees. That was on a very large 1/8th scale track. And I always come off at 130 to 140 and the speedo is around 90 to 100. I always gear to no more than 140 degrees.

UN4RACING

iTrader: (22)

Oh and my battery has come off at 106 once and I think it was from the 5.5.

It usually comes off around 96. 6000's.

kuzo

iTrader: (11)

Holy crap that was fast UN! Is the 4300 running sintered or resin?

UN4RACING

iTrader: (22)

Sintered,
I don't think I have every thermal ed the sintered rotor its the ESC that gets hot now, only in mod though.
5800 or slower thermal issue is gone. I just haven't had any issues sense the Sintered came out. Not one thermal sense I went all sintered. But I gear to a low temp. If you gear to the recommended temp of 160 to 170 you are getting close to shut down temps. I like to have a safe range in temp and there really isn't a loss in performance.

UN4RACING

iTrader: (22)

I see what you mean 3 minutes sorry it took so long.

kuzo

iTrader: (11)

That's the info I was looking for. My ss5800 with resin never got above 150 this weekend. The others stayed 140 or below so I'm running fine.

Ed237

iTrader: (11)

Reading this thread brought me to this question:

Will dropping a tooth on a pinion and being conservative gearing result in lower motor AND esc temperatures? Or does a lower motor temperature result in esc getting hotter.

I'm asking because since I switched to lipo my esc has gone into thermal shut down a couple times.

UN4RACING

iTrader: (22)

Man that is such a tuff Q. What ESC.? There are so many variables.
Gearing to low and or gearing to high will cause an increase in temp. Its a matter of finding that sweet spot. 1 tooth higher can cause dramatic heat increase and 1 tooth lower will be less heat increase. It usually takes more than 1 tooth gearing down to cause the temp to sky rocket.
If your geared to low and on the throttle a lot, it would be the only thing I can think of on being geared to low causing it to thermal.
When I run 5.5 or faster with the sintered rotor I would thermal the ESC. And my battery would temp 106.
Also keep in mind running your ESC for those 10, 15, and 20 minute runs could be some of that. I don't think they were really designed for that kind of run time. Are you using a fan.?
Long run times require some charm as for gearing.

trilerian

iTrader: (51)

BJ4 with the 6.5 sintered comes off the track at 175 degrees after 10 minutes. It will be the same temp gearing from 17-21 tooth pinions, go figure. So I run what gets me better lap times. ESC with fan comes off at about 120, without it about 170. I suggest running a fan with anything over a 10.5 in 4 wheel, 8.5 in 2 wheel.

X-6 with 13.5 sintered, comes off the track at 156 degrees, ESC at about 110, no fan.

I am running platinum 4800 for batteries, while I can't tell you the temp on them, they are not hot.

The hottest I ever got a GTB speedo was 190 degrees at the heatsink, it still seems to work fine.

Supposedly the motor will thermal if it goes over 180, however since I put sintered rotors in the motors, they have never thermaled.