Here’s my Sunday afternoon day dreaming thought of the day.
People talk about ground runs as if they do not correctly mimic in flight power output. I understand this in the sense that, it’s impossible to put enough load on the engine to make it “work as hard” on the ground. However, we always talk about this in terms of temperature. “Can’t get the operating temps high enough”. Think about it in terms of the theory in which camp A would say, if you’re not flying enough, at least give it a good ground run to circulate the oil. Camp B would say, a ground run will do more harm than good in terms of not vaporizing the water/ creating more moisture inside the engine. It’s always argued against temperature.
Conversely, I’ve had old timers watch me troubleshooting my engine or looking for oil leaks, whatever, that’ll rush over and say “you shouldn’t ground run your engine with the cowling off, it’ll get too hot and overheat it.”
and then finally, I’d like to introduce the availability of our handy engine monitors, which measure CHT’s per cylinder. For paragraph one I would ask, How can you say the engine is not getting hot enough as actually flying it, when I can look at the head temperatures and see 380 degrees Fahrenheit. For paragraph two I would ask, how are you risking overheating the engine when I’m looking at a CHT of 380 degrees Fahrenheit?
The two scenarios conflict with one another, yet they are commonly regurgitated. That said, what am I missing here? In either scenario it would seem that you have the ability to control either scenario to your desired outcome simply by utilizing the engine monitor. What say you?