Hot centre diff

[Scoobaru]

I am running a Losi 8ight-T brushless with 10,000 in centre diff. After about 7mins I got a reading of 210F for the centre diff, is that too high ? Would upping the oil to 15,000 help ? For info the motor and ESC were also warm/hot and the car was obviously squating and spinning out the front tyres a lot.

[axeman]

sounds like your gearing to me.. nothing todo with the oil.

what spur and pinion you running??

what electrics???

[Candyman]

Yes your front wheels are spinning up, basically the centre diff is getting a work out! I had a crt.5 that I put mamba 2650 in on 4s, The centre diff (5k oil) got so hot it melted the rubber boots on the propshafts. I had to run thin oil to stop the wheelies but in the end dropped to 3s. Anyway, as your centre diff works it generates heat, so long as its not melting anything it wont matter., but if you can go a bit thicker without upsetting handling then thats less power lost in heat and more on the track.

It has nothing to do with gearing, why would it.

[axeman]

Originally Posted by Candyman

It has nothing to do with gearing, why would it.

the lads esc and motor are also getting hot.

The motor is bolted to a metal plate (motor diff mount) which bolts to the centre diff.

The motor will use the motor diff mount like a heat sink which in turn will heat the centre diff.

If you run a thin oil in the centre diff it will allow the diff to transfer drive to easily which will heat up also, but wouldn't explain a hot esc and motor.

the truck is more than likley over or under geared.

[jasonwipf]

Yep, when My motor is doing about 180'F My center is at 125'F or 30% cooler. If your Center is 210F what is your motor running? EKK

If your center diff is Hotter than your motor then you could have some gear problems. The oil thickness shouldn't make any differance on your temps, unless your running some super think diff locking 50,000wt that will all but lock your diff down.

Infact if your motor is running cool and your diff is still hot and you can't figure it out, ask someone who has a revo or would carry a little 50-100k wt diff oill so you can try that and rule out inner gear mess issues.

Also, what motor are u running and what are the motor/esc temps?

[Neobart]

If center diff is hotter than the motor, the diff is surely diffing out. 10K is a little light for a e-truggy. I run 10k in my e-buggy. I would go up to 15K and see how it feels, IMO it has nothing to do with the gearing.

[Scoobaru]

Originally Posted by jasonwipf

Yep, when My motor is doing about 180'F My center is at 125'F or 30% cooler.... Also, what motor are u running and what are the motor/esc temps?

That helps, basically I guessed that the centre diff should not run hotter than the motor, which it was.

I got a Castle Mamba Monster / 2650kv combo thinking I wanted the fasted motor for 4s running. However it was running about 180F on 13/46t gearing (40mph top speed) on grass after 7mins with a twin fan heatsink which is too high. The ESC was above 150F as the fan was on. I have since obtained a Castle 2200kv and changed gearing to 15/48t with a new centre diff running 15000cst. I will do another run in similar conditions and check all temps again.

I suspect if I try running a 6s pack I will need 20,000 or higher.