Sorry but the two do run at the same temps. for helos I have a .91, .50, and .32. For airplanes I have from .049 to gas and they all run the same temp. Even my motorcycles run at that temp, my car too. The bike and car are water cooled and the thermostat controls the flow of the water to about 195 but the head and cylinder temo is actually 200-220. You can disagree but I'm right. With internal combustion piston and cylinder engines they all run best at these temps.....

What do you think the temps should be? What are you running on the 90 and 50?