tcarrico wrote:

<snip>

The MMO pump, as I understand it, is intake manifold vacuum driven.
As someone has pointed out that is not what is needed. In fact it
is the opposite of what is needed. A simple direct drive pump
off the e-shaft would be better and probably adequate for an aircraft
engine that spends its entire life at 5000 RPM or above.

If you port the oil to a Venturi, you should have your "Pump" free
alternative.  Oversize the Venturi if you are worried about
restriction.  As the RPM increases, CFM through the Venturi increases
which increases the pressure differential across the oil tube.  This
pushes more oil into the airstream.

You can use fuel jets or the like for metering at maximum differential.

I personaly am going the pre-mix route.  Great advantage to having
oil everywhere you have fuel.  Without premix, you are not really sure
where the oil will end up.  Maybe coating the walls of your intake,
instead of mixing with the Fuel/Air.  My only concern here is with ratio
creap.  I will not be as accurate as the fuel tanker, so I will error
a little with each fillup (add a little more, or a little less than
optimum).  This small discrepancy may turn into a
big one, or nothing at all.  If this is all I really have to worry
about, I'll take it.

tc, the Pre-mixer ;)

 
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