ORIGINAL: DarZeelon
ORIGINAL: TRITINY
If you run an OS too lean or under prop it you'd loose the crome on the cylinder which will cost half the cost of the engine to replace.If you do the same with MVVS you'd loose the idle needle would'nt cost much
Trinity,
On the OS you will lose the
nickel coating. There is no chromium in newer, ring-less OS engines.
MVVS is true chromium plated. Most often the engine will overheat and cut out, if run too lean, but after cooling down, it will live to fly another day.
In combat you do not want to land when the engine is lean. Instead, you plod on to gather points, try to evade the omnipresent opponent, try hard to get the engine to cool down a bit, and maybe get back on the opponents six by surprise; playing chicken will cost dearly earned points.
My experience with MVVS is that for the next flight just set the engine richer, and fly the hell out of it again. Lean runs so far have not been detrimal to piston fit, even after runs that should fry any engine.
Once lean and hot, the engine has a hard time regaining the required running fit again in the same flight though. It will stay too hot, unless given a chance to cool down again by prolonged reduced power flight.
FWIW: I fly 20% oil in run-in engines, and 25% oil in new engines.