[Doc Wu]

In a 2-3 minute match, the CIM motors don't have time to get very hot. What we've noticed is that the worst conditions for them are during practice and demos when they are driving for longer periods of time, especially as they get used under low battery conditions.

As another poster said, the source of the heat is deep in the windings inside the motor and it takes quite a while for it to migrate to the outside of the case.

That doesn't mean that it's not of some benefit to remove any heat you can from them, but it's probably too little, too late for typical match use.

If I were going to install them on a CIM motor, I would use a heat sink compound, much like the heat sink on a CPU or transistor. The paint on the case would be a consideration as well, but with the narrow views of what is considered a "modification" in the rules, I'd be afraid removing paint might be a problem. Even the silicone compound might get questioned.

I'd save them for the practice robot.