ORIGINAL: wuhouse
Dear ALl;
Thanks to all the folks.....I managed to strip the engine apart and look at the internals, gave the egine a good wash, and put everything back. Honestly, I do not know how long it was ran before, but I could not see many scratches inside. I tried to fire up with a new OS F plug, and an APC 13X8 on Coolpower 5% fuel. It starts, runs, but need the HSN to be turned to about 1 1/4 turn (default is 2 1/2) to get full power. After which when I try to idle (default 4 turns in at the LSN) it will die. A guy told me that the piston ring needs to be changed because the compression is no good. Is this true?
Wuhouse, forget factory needle settings for model glow engines. They do not exist unless you are running expensive regulated fuel systems. Unlike gasoline engines, our model glow engines do not possess a fuel pump, they they rely entirely on suction from the carburetor to draw fuel. The height of the fuel tank, the length of the fuel line and many other factors will influence where the needle valve should be set.
You can always run a model glow engine too rich and be safe. However, you can never run it too lean without risking severe engine damage. Make sure the mixture is always rich.
Another point to ponder is that the lubricant in model engine fuel is never meant to be consumed during combustion. It is intended to be expelled completely from the engine, which means that even with the mixture adjusted to as lean a point as is safe, one fifth of the fuel, the oil, will be expelled from the engine's exhaust. This is normal. Tuning leaner to minimize the oil being expelled will ruin your engine very quickly. Glow engines utilize a total loss lubrication system and they are messy. That is just one of their less endearing characteristics.
I have dealt with PeakModel (
www.peakmodel.com) over a half a dozen times and have had great service from them. I can recommend them whole heartedly.
Ed Cregger