Perry Mick wrote:

Is it possible that with older rotary engines the internal oils
seals leak?  My rebuilt engine is using much less oil than
my old engine, even though I still have the oil injection
system.

Well, if your rebuilt engine's crankcase oil injection system is working
(seems likely), and the rebuilt engine needs less supplemental crankcase
oil, then your old engine *must* have been leaking oil.  It's possible that
the old O rings were tired and letting oil slip into the combustion
chamber.  You can't say for certain that the leaked oil was into the
combustion chamber, though.  Maybe it leaked out elsewhere...

I started mixing two stroke oil with the gas in addition to
the oil injection.  Just as insurance, and it's easy anyway,
since I usually fill up with two 5-gallon cans from the
gas station.  I just add about 8-10 oz. by volume (cut-off
water bottle) per 5 gallon can of gas. Is this about right?

At between 1:80 to 1:64, that's higher than you need.  The consensus seems
to be that 1:128 (1 oz. / gal.) is fine.  The excess doesn't hurt, it just
means you're burning more two-stroke than you have to.  Try one 10 oz. per
two 5 gal. gas cans; that would be 1:128.  Try *not* to use only 8 oz. per
two 5 gal. -- then you'd be down around 1:160 which might be borderline
insufficient.

BTW, how are you adding the two-stroke?  It seems to me that adding the two
stroke to the plane's tank(s) in one slug prior to fueling could yield
marginal mixing.  It also seems to me that adding the two-stroke into the
gas can in one slug prior to fueling the *can* should give more reliable
mixing.  (Presumably the fuel in the can *always* going into the plane.)
The best mixing is achieved by dribbling the two-stroke into the plane's
tanks, or the fuel cans, as the gasoline is added.  This also seems like a
good way to get a big mess if one has too few hands.  :-)

I think my fuel-sight gauges don't like the oil in the gas,
getting some strange crazing.

That seems peculiar.  I would expect a gasoline-tolerant sight gauge to be
oblivious to the two-stroke oil.  Do you know what the sight gauge is made
of?  What type of two-stroke are you using?  What, if anything, are your
tanks sealed with?

Russell Kent

 
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