You can do a test yourself. Place a drop of gasoline down the barrel of a daisy BB gun and fire it....no effect. Use a drop of oil
and you will hear the detonation when the lube oil detonates. Further, try running a diesel engine on high octane gasoline and see
what doesn't happen. You may be able to move to 50:1 from 100:1.....maybe, but modern two stroke engines use a lot more
compression than the older ones and when using too much oil in the mix, you will melt a piston.
Steve
"Flying Pig" wrote in message ...
"Steve Lusardi" wrote in message ...
Ted,
Adding lube oil to gasoline lowers the flash point of the fuel increasing the chance of detonation. Oil in the fuel is
necessary for these type of engines, but NEVER use more than the manufacturer's recommendation. Failure to follow this simple
direction could melt the pistons, the heads and effectively ruin the engine and I have seen this hundreds of times. I know this
is counter intuitive, hence the number of times this failure occurs.
Steve
Interesting. The Outboard Shop, the local evinrude/johnson dealer, gave me the exact opposite recommendation. The question came
up with my newer engine which is designed to run on 100-1 mix. They told me it will run just fine on the same stuff as my older
engine, a 50-1 mix. They also cautioned me that the least "too-little" mix , such as missing by a bit when filling from a
not-empty supply and having to guess at the right amount, could turn it into an anchor. Failure to use enough deprives the
engine of its lubrication, and things seize up.
Further, my manuals for both engines show to use double the oil in severe use conditions. I.e., in the newer one, 50-1, in the
older one, 25-1. More oil, at least as inferred from the manuals, assures that won't happen, even if you overdo it.
I grant you that quadrupling the oil may have some deletorious effects, but my common sense tells me that 16% more than
specified as ADEQUATE should not be a problem.
Also, I've never seen oil being more subject to explosion/flash than gasoline. How does adding oil to fuel make it more
volatile?
L8R
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