Question and thoughts about Oil injection.

Because the series 1 RX-8 engine is a bit short of oil injection as
Paul has
mentioned could or would an option be to add some sort of oil
injection into
the intake system to spray a fine mist into the intake system?

I think this would be rather like a 2-stroke oil injection system/s used
on Rotax engines and the like.

My thoughts were use the oil injection system that exists on the
Rotary but
add another injector into the intake system to spray 2-stroke oil using a
Richard Sohns adaptor.

Does anyone have any thoughts about this?

I'm just thinking out loud with ways to add lubrication oil for the Apex
seals, without requiring to premix it.

My thoughts about this is you don't need much oil at low RPM eg when
idling
on the ground, warm up, low rpm for descent and the like but you do need
more oil for high power settings to ensure that there is enough
lubrication
for the seals when they are under high power.  What do other think of
this
and if so what size spay nozzle/s would be needed?


Regards David (Australia)

The oil injection takes place when there is a vacuum in the intake
chamber.
The injector has a one way valve so atmospheric pressure does the actual
injection. The metering pump does just that. It meters the oil to
the injectors.

The metering pump controls a stepper motor by sending out pulses on
four wires. The cheapest and easiest way to modify the amount of
oil metered is to insert a low cost microcomputer in the wiring harness
that reads the pulses and modifies them in such a way that increases
the amount of oil metered.

http://www.imagesco.com/articles/picstepper/02.html

I recommend something like a BASIC stamp as a 3rd grade student can learn
to program it in BASIC. Here is the company I would go with as I have
extensive experience with their product and their $100 prototype board
is extremely easy to use.

The final product could cost under $20 for parts.
http://www.zbasic.net/

Paul Lamar

Paul,
Re oil injection if the oil in injected on the suction side of the fuel
pump, after a little while the fuel in the tank/s will have lots of oil
in it/them, because the fuel pumps flow at least twice the amount of
fuel required by the engine, so each time it goes around the fuel gets
another dose of oil, unless of course you are refering to a carburetted
version.
     John Burey

Good point. Back to the dwg board :)

Paul Lamar