Todd Carrico wrote:

 Bill

I was thinking high pressure side of the pump.  Sorry for this
misunderstanding.

I do not think you would need any sort of venturi for this to work.  Just a
metered supply of oil.  A T fitting on the supply side of the pump, with
check valves to prevent back flow into either tank.  That would prevent the
point of failure, and you have only increased your part count by four (T,
two check valves, Oil tank).  The pressure head (or lack of it) would be
equal for both sides of the T, but the orifice in the oil side should keep
the ratio constant.

It would be very easy to test.  Hook the plumbing up on a bench, and pump
from known quantities of fuel and oil.  Pump into a container and do the
math.  You could prove it works, and get your jet size, all with out risking
plane or pilot.  You could use a needle valve, but then you introduce
another failure mode.  If 100:1 is a good ratio, or even 1 oz. to 1 Gal.  A
little trial and error on the bench should get you where you want to be.

I think that you are on to something here.  I like the idea.  It is almost
as simple as mixing the oil with the gas.

As an alternative, you could install locking fuel caps, and this would
virtually guarantee that you would be their when fuel was being put into
your bird.  Then just add oil when the fuel is being added.

Thoughts?

tc

 
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