[BrianG]

Thanks Mike. That's kinda what I was figuring, but without the amperage rating, or wattage rating to calculate amperage based on the number of cells used, on a specific motor, it's hard to guess what will work safely. At least the Lehner 19xx series does tell you max power it will handle, but those cost too much. I imagine a similarly sized non-Lehner can would dissipate approximately the same wattage, but the thickness of the can and how well the heat transfers from the coils to the can makes a difference. I suppose I could just get the largest amperage available to be safe, but that darn cost factor gets in the way. :)

BTW Mike, would increasing the size of the heatsink on any controller void its warranty? Of couse, if something went wrong as a direct result of the heatsink upgrade, I wouldn't expect to warranty it.