Originally Posted by
monkeyracing
Heya. Yeah, stock diff. I've built so many of these and have seen so few failures in my FWD cars. We did see an increase in failures a few years ago when the M06 became popular, but not nearly what I've experienced n the past year with the M04.
Diffs are built carefully - well beyond instruction manual levels. I've even gone so far as to deburr all the internals and break in the gears manually, followed by cleaning and inspection afterwards. AW grease is always used.
The motors are 18t versions of the "Hobbywing style" cans. They spin around 2200kv and have a little more torque than the 13t. When my race finished o Friday, I picked up my car and the motor was HOT. I don't think the gasket would have made a difference in this case.
The only conclusions I can come to are that the extra wheelspin created by a very loose diff in a RWD car is creating extra heat/wear internally. As to my breakdown on Friday, I'll go through the bearings again very carefully and look for signs of heating on the gear shafts.
Thanks, Jim
Hi Jim, really interested in some pics of your damages. 18t should really be no problem. Do you drive the diff very loose, although greasing with AW? Should give some stiffer action, at least for some laps. Ever tried a more closed diff in your M04? I made some good experince with tighter diffs in my M06 the last 2 years, although I never thought this could work in an RWD Rc-car.
Could reduce the revolutions of your counter gears and help to extend the life span maybe...
I think, also quality of the metal parts reduced the last years, as one race collegue also shreded this diff in his M06 shortly after finishing the kit.
Back in the days in my M02 I never had a problem even with some hotter brushed motors in racing driving it RWD.
All the best for your analyze of the sucker,
Matthias