This is the final Mod I wanted to do with my truck. I have been using the Castle fans over the years, but I really don't think they cools things down that much. I looked at other heat sinks, but coulldn't find any that would fit the ribbing on my Castle 2200kv motor.
For a heat sink to work well you want it to do three things. 1) pull the heat away from the sourse, 2) spred out the heat, and 3) move the heat away from the heat sink. There are better ways to do this then how I did, but this was something I could make at home with common household supplies.
This is made from a 1 1/2 inch brass sink drain pipe, and 1/2 inch copper water pipe.
These are Novak fans I got from RC Boca
And, here is everything hooked up a ready to go. I also installed telemetry, so I could keep an eye on things better.
If any of you are interested in making one of these; I can tell you how and, what few things to look out for.