Did some thermal images with my FLIR E50. Slash 4x4, Tacon 2800kv, 15t pinion, stock spur, 3S 4000mah 40-50c, WP-SC8 ESC. I did the images right after I hit the neighbors trashcan wide open and took out my left a arm and ESC mount. Fun over...
The first image is at rest, room temperature.
Second image is after 15 minutes of speed runs. Ambiant temperature was about 70 degrees.
As you can see, the aluminum motor mount is definitely dissipating heat.