The round finned heat-sink that Marty saw at the Group-C race at Electric Dreams last year; ARE very effective at absorbing motor heat during pits between Heats. All you have to do is – after cleaning your tires and braids, –flip your car upside down or, on its side, attach the heat-sink to the motor over the vent hole. To increase cooling, blow on the heat-sink until you need to position it on the track.