Many moons ago I dabbled in nitro vehicles.  Almost all setup instructions for tuning the engine centered around getting the engine to run in a specific temp range.  However, I've noticed almost nothing is mentioned (from what I've read so far) about engine temps on airplanes.  About the only measurement I see is tach readings.  Granted, the well worn veteran can probably get it right just by tasting the exhaust (or listening to the rpms), but sometimes our senses can fool us.  I would think an unthrottled C/L engine would be the easiest since it runs at a constant speed unlike R/C in which the rpms (and load) can vary throughout the flight/drive.  Is temp not so much of an issue with the abundant airflow over the engine?  Is it ignored because senses alone can get you in the sweet spot?  Is there something else I am missing?  Just curious.