You guys in the frozen tundra might consider the a thermostat for a 912. I was looking at Stolp Vortex Generators, and this looked interesting, but it is not something I need in Texas! If it's -10 Degrees I am staying home!
"Results
My testing showed that at outside air temperature of 12ºC (54ºF), head temp was 50ºC (122ºF) at 2 minutes and 80ºC (176ºF) at 4 minutes. Before the thermostat, I hadn’t been able to get to 80ºC at all while on the ground. This feels much better to me for the full power take-off than at the much lower temps before. Once in flight the head temps locked in at 91ºC (195ºF) on the right side, and 87ºC (189ºF) on the left side, and stayed there, regardless of full power climb or idle descent."
http://www.stolspeed.com/thermostat-for-912