RC_Noob
Active Member
- Messages
- 36
Hi Guys,
My ECX AMP hasn't been running for a while. I installed 15T motor and on the first run I stripped the spur gear. I replaced that with a metal spur and pinion and on the second run the drive shaft broke. The motor was also running really hot. During lock down I struggled to get a replacement part and then just forgot about it.
I finally got around to replacing the drive shaft, I loosened the slipper clutch a little to ensure it didn't happen again and the car is up and running.
However, the 15T motor is giving a faint burning smell and braking doesn't seem as good. When I replaced the spur / pinion I couldn't get like for like ratio's.
I believe the stock was 18T pinion and 87T spur, a 4.83 ratio.
When I ordered the HR replacement ones I had to go for a 20T pinion and 83T spur, a 4.15 ratio.
I already have a heat sink / cooling fan fitted so the motor isn't getting as hot as it did on those first runs but I'm guessing the smell isn't a good sign. Does a ~15% reduction in gear ratio cause that much of a difference to running temperatures ? I do have a 16T pinion I could try that would raise but I would need to modify the car otherwise I can't get them to mesh.
Just throwing this out for ideas / thoughts as to what to do
Thanks
My ECX AMP hasn't been running for a while. I installed 15T motor and on the first run I stripped the spur gear. I replaced that with a metal spur and pinion and on the second run the drive shaft broke. The motor was also running really hot. During lock down I struggled to get a replacement part and then just forgot about it.
I finally got around to replacing the drive shaft, I loosened the slipper clutch a little to ensure it didn't happen again and the car is up and running.
However, the 15T motor is giving a faint burning smell and braking doesn't seem as good. When I replaced the spur / pinion I couldn't get like for like ratio's.
I believe the stock was 18T pinion and 87T spur, a 4.83 ratio.
When I ordered the HR replacement ones I had to go for a 20T pinion and 83T spur, a 4.15 ratio.
I already have a heat sink / cooling fan fitted so the motor isn't getting as hot as it did on those first runs but I'm guessing the smell isn't a good sign. Does a ~15% reduction in gear ratio cause that much of a difference to running temperatures ? I do have a 16T pinion I could try that would raise but I would need to modify the car otherwise I can't get them to mesh.
Just throwing this out for ideas / thoughts as to what to do
Thanks