I have an Enya SS35 that it about 10 years old. It has been in its box all this time until I finally installed it in an old Shuttle about 8 months ago. About six months later, I transferred it to a new Shuttle Plus.
It has always been perfectly reliable; it always starts easily and has never flamed out. Like all of my engines (2 and 4-stroke), I run Cool Power Pro Pattern 20/20 fuel in it. I'd guess it has in the neighborhood of 10 gallons through it. I've always used an OS #8 glow plug in it. I run the mixture just lean enough so that no raw fuel comes out the exhaust (usually about 1 3/4 turns on the main needle). But if I richen it a few clicks, raw fuel will come out.
I usually start off my first flight of the day by shooting a few autorotations (just in case). Yesterday, about 1 minute into the first flight of the day I set up for an auto. About halfway down the engine quit. Very strange. I ended up dorking the landing and finishing my day (bummer). Anyway, when I got home and starting tearing everything down to assess the damage, the engine didn't seem right. So I pulled it and found it would not rotate through bottom dead center. I took it apart and found a very small piece of metal trash in the crankcase - it was about the size of a few grains of sand. When I removed the cylinder head, I was shocked to see hundreds of tiny pits in the top of the piston and inside of the combustion chamber. It looks as if somebody took a centerpunch and went to town on it.
My first thought was that the trash in the engine had done it. But then I thought that to be unlikely - if some trash did get into the cylinder, it would've been blown out the exhaust and not been around long enough to do all that damage.
Anybody know what this is?
Blade 550X, T-Rex 450 Pro FBL