Back to the original post.

I know very little about turbine engines, but I do know about recips used in airplanes. The more powerful engines use an exhaust gas temperature gauge as the primary instrument for adjusting the mixture in flight. Some airplanes have one probe on one cylinder, usually a rear cylinder, and others have probes on all cylinders that read individually on the gauge. It's interesting to note that there is no real temperature setting. The engine is peaked out, and then richened for best power by going to 50 degrees rich of peak. Conversely, for best economy, it is set to 50 degrees lean of peak. On an engine with no EGT, the tach is used to get close, but it's not as accurate.

On model engines, we are basically doing the same thing. Finding the peak rpm, and then richening from there for best performance. Since the temperature is not necessarily required to be in a certain range, the temp it runs at is basically useless. (of course, this assumes the engine is running right and not overheating).

It would be interesting to learn if model engines act like full scale engines. Does peak rpm = peak temperature? Does the temp start to decline as you go to the lean side of max rpm? Are two stroke engines totally different than full scale engines? How about the four strokes? They are lubed the same as the two strokes.

It doesn't really matter. So long as it's not running too hot, and it makes good power.