Wschertz@aol.com wrote:

In a message dated 5/9/99 3:04:28, Paul Lamar wrote:

Much Snip

All you need now is a T and a couple of ball check valves
to build yourself a "primer" type oil pump that will
pump oil into the fuel tanks.  Waggle the wings and
kick the rudder to mix throughly.

I have read the series on oil injection with great interest.  I have also
watched how the oil mixes with gas for my snow-blower and chain saw, and what
the manuals state as good mixing practice.

1. They caution about pouring the oil into the gas in the can, as it will
sink to the bottom and *not* mix well with the gas. The recommended procedure
is to add the oil to the empty can, add a small amount of gas, seal the can,
and swirl it vigorously to mix it up.  Then add the rest of the gas.

2. The plane I am building has a wet wing fiberglass, and uses the ribs as
baffles to prevent sloshing of the gas.  In fact, it uses a 'slosh valve' to
keep fuel from flowing from the root bay during uncoordinated manuvers.
Therefore I don't think that 'kicking the rudder and waggling the wings' is
going to do much for mixing.

3. Tracy's method seems to work, but may lead to variations in the amount of
oil in different bays of the tank, assuming the RV-6 is a baffled tank, due
to possible incomplete mixing.  I don't know if this is a serious problem or
not.  I like the idea of using the equivalent of a hose end sprayer to add
the oil in the right ratio, but using it *at the fuel truck nozzle*, i.e. as
the fuel is being pumped into the tank, it meters in the 1oz/gal rate, and
you watch the oil in a reservoir go down, knowing that it is being intimately
mixed, because the nature of a venturi and suction system is that it has high
shear rate, therefore good mixing.

Bill schertz

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