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pe reivers -> RE: mvvs 1.60 gasser (11/29/2003 10:02:29 PM)
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alculating the oil addition is easy.
3/4 gallon is 3 liter (about)
this contains 3/40=0.075 liter oil (75cc)
3 liter should contain 3/33=0.090 liter oil.
The difference is 0.015 liter, or about 1/2 ounce.
I know MVVS recommends 1:50 when run in. They also recommend Mobil 1 2T oil, which is not available everywhere, and they have steadily increased the oil content for the glow engines.
I use Castrol scoot-r at 1:32, and have extensively tested with Valvoline Synpower, at ratios up to 1:80.
At the field I tend to observe the "feel" of the engines, and thus determine if I use the right lubrication amount.
So far, using the common available quality low ash semi-synthetic oils, 1:32 felt best, and allowed the engines to rev up freely. It did not matter much which oil brand, as long as the engine did not turn sticky when cold. That made starting a bit more difficult. (lazy flips hand starts)
It is difficult to say when the running in process is ending. At first, the engine limbers up, and reaches top power; it will accept sustained full power. Then, when parts wear some more, the engine becomes truely free, but may very slowly start to loose some power due to larger internal clearances which cause increased gas leaks. That is when the engine is fully run in, and even accepts quite severe abuse every now and then.
That state will not be reached in two gallons. It takes some more than that, and in the process, the engine will adapt to the pilot's habits for better or worse.
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