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Message
Based on the experience of Finn, Tracy and myself,
there is no doubt that unburnt 2 cycle oil does (at least for us) migrate
to the sump with pre-mix. Apparently a small amount of the 2 cycle oil in
the fuel is deposited on the metal surfaces including the sides of the
combustion chamber. As the rotor oscillates its seals apparently
sweeps some of this oil into the center housing to mix with the cooling sump oil
dumped there and then flows to the sump.
The rate of 2 cycle oil build up seems dependent
upon the ratio of the mixture. I find that mixing 1 oz per gallon,
I will have approx 1/2 cup of additional oil in the sump after 10-15
hours. If I reduce the oil to 3/4 oz per gallon, it seems to reduce it to
practically nothing.
The first time Tracy told me his engine was making
oil, I would have been very skeptical (had it been anyone other than
Tracy). Then I begin noticing that after a period of time my oil level
would be up to the drain level of my PSRU return, so I would drain 1/2 cup or
so.
FWIW
Ed A
----- Original Message -----
Sent: Wednesday, January 26, 2005 2:12
AM
Subject: [FlyRotary] Re: oil analysis
results
a portion
of the fuel/air mixture is pushed into the crankcase (for lack of a
better term).
Finn made a statement a few
weeks back that he had to drain oil from his sump because of the fuel that had
gotten past the side seals. And
he’s flying.
Bob
Perkinson
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