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Guest
Guest
You've never seen a piston with a hole melted through it? It only takes a short run with a mixture that is too lean to melt a piston dome.
No matter how much oil you use in the mixture.
Ultralight aircraft have an EGT (exhaust gas temp.) gauge to monitor the internal temps. When running WOT at take off, they run somewhere around 950-1000 degree F. At cruise, they run around 1000 1050 degrees. A very short run at 1300 (due to a lean mixture) will result in a holed piston, or at least melted ring lands, which in turn causes high heart rate, loud explatives from the pilot, and most times, other damage to the aircraft.
What I'm trying to say in laymans terms is-
"If you run downhill, wide open, engine screaming, long enough, expect the worst."
ie "asking for a meltdown".
No matter how much oil you use in the mixture.
Ultralight aircraft have an EGT (exhaust gas temp.) gauge to monitor the internal temps. When running WOT at take off, they run somewhere around 950-1000 degree F. At cruise, they run around 1000 1050 degrees. A very short run at 1300 (due to a lean mixture) will result in a holed piston, or at least melted ring lands, which in turn causes high heart rate, loud explatives from the pilot, and most times, other damage to the aircraft.
What I'm trying to say in laymans terms is-
"If you run downhill, wide open, engine screaming, long enough, expect the worst."
ie "asking for a meltdown".