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Old Nov 24, 2012, 08:09 PM
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USA, TX, Grapevine
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Maybe so, but as a engine gets more small in displacement, the oil needed is more and conversely a large engine needs less and less as it gets bigger and bigger. Mr Duke Fox originally came up with that and it seems to hold true even today. The big Supertigre glow engines are usually a good example in that the G3250 works fine with 12% and maybe 10% oil in the fuel. They actually sell special low oil content Supertigre glow fuel here in the USA too.

But I managed to spin the bushing out of a couple of rods on two of my NGH 9cc engines. I assume it was because the engines went lean in the air when the fuel pump had problems. Michael Chow thought it was a defective rod. But then maybe not. With the more lean air to fuel ratio in a gasoline engine, there is less oil as well and a more lean run can become bad really fast. Thus I tend to be more paranoid about it at this time. so far none of the engines have had a rod fail again, so maybe it works.
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