What about running your glow engine dry, at the end of the day?
In having some ring-side conversation at the field one day, a pilot had mentioned he runs his engine dry when hes done flying for the day. Another pilot chastised him for this, and said he shouldnt do that. Id like to set the record straight BS, BS, BS!
Running your engine dry when youre done for the day, is (in fact) the best possible thing you can do to prevent corrosion.
And heres why: First of all, you cant literally run
a glow engine DRY. The fuel simply contains too much oil. The engine quits running
because there wasnt enough methanol/nitro (the active part of the fuel) to sustain
ignition. HOWEVER theres more than enough oil (the passive part of the
fuel) to lubricate the bearing surfaces until the engine completely stops running (even if
its running at full throttle). In my 37 years of RC modeling I have never damaged an
engine because of running it dry when done flying for the day..
In my 37 years of RC modeling I have never damaged an engine because of running it dry when done flying for the day..
THREE things happen when you run a glow engine dry or below Ignition Capability:
FIRST: it removes the fuel from the crankcase, lines, carb and tank.
SECOND: it warms up the engine; a warm engine quickly vaporizes the remaining methanol and nitro in the crankcase.
THIRD and most important: the fresh air passing through crankcase purges the remaining fuel vapors only leaving the oil film as the engine spins down to a stop.
If you DONT run it dry, you are leaving highly corrosive methanol and nitro methane through out your engine! Then you kill your engine by closing the carb, your crankcase has lots of active methanol/nitro in it, as well as well as solid fuel in the carb and fuel line. So you removed the solid fuel from the fuel tank. BIG DEAL! Your crankcase, carb, and fuel supply line are still loaded with active (and very corrosive) fuel. So then you put after-run oil in the carb and spun the engine over. Unless you spun the engine over enough to completely purge the crankcase, carb, and fuel line, you are not even remotely of the woods yet. And then theres the cold engine. A cold engine wont evaporate the active part of the fuel as quickly as a warm engine, so vapors stay in the crankcase for a long time. Its these active vapors combined with air that destroy your bearings and other ferrous engine parts! If you use after-run oil and didnt run it dry, or totally purge your engine you will end up with this:
This owner USED After-Run Oil
religously, but didn't purge or run it dry. The active vapors penetrated the
after-run oil and totally destroyed the bearings, crankshaft, camshaft, and rod along with
other misc. parts.