David Carter wrote:

Paul, the reason my modification scheme focuses on feeding the 2 stroke
oil to the metering pump using "normal engine oil pressure" was to stay
"stock" so the metering device would meter the same amount of oil that
it does now, without need for a separate oil system (pump and pressure
regulation).  Seems we'd need to be careful that your pump-in-the-tank
put out the same pressure as the engine pump, my basic assumption being
that the "injection pump/metering device" output is directly related to
input oil pressure, i.e., that it is not really a pump, just metering
oil under pressure supplied by the engine oil pump.

I've never even seen or handled an injection pump and never read
anything about them and am making all kinds of assumptions about how
they work.  So, I'm not advocating a specific solution, just trying to
spark discussion and feedback from anyone who may have the needed info.

David Carter

The pressure has little to do with it as it is feeding into a low
pressure
chamber of the rotary engine. If it encounters pressure a positive
displacement pump like a gear pump merely responds by upping the 
pressure. It is not like a centrifugal pump where flow depends on 
output pressure.

Just check the volume output of the pump as a function of RPM because
the variable flow as a function of HP is not needed because you will 
be using a prop load. Prop load HP *** IS *** a function of RPM
with a fixed pitch prop more or less. 

Flow as a function of HP was needed in the car primarily to reduce smog.

If you must use a pump a gear pump will be much more pratical to 
mount, drive and feed. If it was me I would mix the two cycle oil
with the gas and forget about it. Less to fail.

PL

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