Big rock thermal at 125f ?

ThatOneGuy

Well-Known Member
Messages
8
Likes
3
Location
Central'ish, IL
Arrma RC's
BigRock
My new big rock is doing the same thing. Very coggy and doesn’t wanna get going and anytime it gets loaded down/stuck it shuts down, off-on and it’s working again. Default settings, stock gearing, does it on both 2s or 3s.

Edit: and it also just hits the brakes and stops right there when it hits lvc. And of course it’s always away from me out in the street.. lol
 
Last edited:
Thread starter #24

The bashist

Premium Member!
Premium Member
Messages
225
Likes
154
Location
Knoxville Tennessee
Arrma RC's
BigRock, Granite, Kraton, Outcast, Talion, Typhon, BigRock 4x4
Ok so, I just ran a 3300mah venom 35c pack through the big rock. No issues in 31 degree temps. Wth
 
Messages
2
Likes
0
Arrma RC's
BigRock 4x4
Hi all, new guy here!

Has anyone managed to find out why the big rock gets so hot?
At the end of a 5amp lipo I can only touch the motor for a couple of seconds. This is mainly from driving on tarmac (though at high speed). This is even with an outside temp just above freezing.
Ive replaced all the bearings with rubber sealed ones, tried adjusting the slipper clutch and took a needle file to the motor mount to adjust the gear mesh.
It rolls nicely so I can only think it's the stock setup.
For now I'm going to add a fan to the heatsink.
Any help appreciated!
 

Notorious J

Premium Member!
Premium Member
Messages
820
Likes
593
Location
Canada
Arrma RC's
Notorious
Hi all, new guy here!

Has anyone managed to find out why the big rock gets so hot?
At the end of a 5amp lipo I can only touch the motor for a couple of seconds. This is mainly from driving on tarmac (though at high speed). This is even with an outside temp just above freezing.
Ive replaced all the bearings with rubber sealed ones, tried adjusting the slipper clutch and took a needle file to the motor mount to adjust the gear mesh.
It rolls nicely so I can only think it's the stock setup.
For now I'm going to add a fan to the heatsink.
Any help appreciated!
The "touch" method is not your best bet. You need to get a decent infrared thermometer to check temps. A motor can is hot after a good, hard run, but touching it won't tell you if it's too hot. You need to measure the temps, and research what's considered acceptable.
 
Messages
2
Likes
0
Arrma RC's
BigRock 4x4
Forgot to say I have checked with a infrared thermometer and it's up to around 160-170 f. I did try a fan with a much smaller heatsink so I'm going to try the same fan in the stock heatsink.
 

Similar threads


Top