Speaking of Oil Metering Pumps Richard Sohn came up with a good way of using the RX8
version in an aircraft. They are not really pumps but that is another whole subject.
Normally these RX8 "pumps" are controlled by the computer to  control HC emission to
a ridiculous low levels driven by water melons :) (I still put a half ounce of 2
cycle oil per gallon in the tank of my RX8. Ironically it still passes draconian
California  smog tests with the lowest number the official testers have seen.)

Putting oil in the fuel works great because the amount of oil depends on the power
alone because that is what the apex seals want. The oil actully cools the seals as
they normally run too hot. Over 500 F.See the attached jpg.

It is a long standing tradition with 2 cyle engines. It also distributes the oil
better in the combustion chamber. Anywhere from one ounce to four ounces per gallon
works great. See the Walmart funnel.

However some people think mixing oil with the fuel is too much trouble so there is a
demand for a way to do it automatically. Richard makes and sells an adapter that
feeds 2 cycle oil from an aux tank rather than using crankcase oil. Crankcase oil is
not the best oil to put in the combustion chamber as it does not burn without residue
unlike 2 cycle oil.

http://www.fairpoint.net/~res12/html/omp_adapter.html

To quote Richard:
"The RX8 OMP is equipped with a position sensor,  which monitors the position of the
control shaft on the pump. This position sensor may be replaced with an adjuster  to
set the control shaft to a fixed position. In this way, the OMP is fully functional,
giving an oil amount comparable to oil mixed in the fuel."

Paul Lamar

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