Snip

--

That sounds like a good solution, but it is not what I really want to make
sure of.

I already have one of Richard Sohns RX-8 oil adaptors and a meter adjuster
plate. This allows the oil injection system to vary oil rate injection
based on RPM, which means the electronics are no longer required.

What I want to ensure is whether adding an extra oil injector or injectors
into the intake system for 2-stroke oil injector would be a good option or
addition. If it is, then where is the best place to add them or it in the
intake system, the stock manifold is being used for this project.

I thought this might be a fairly elegant solution. The RPM of the engine
controls the flow of 2 stroke oil that is injected. I've attached the
adapter information that Richard provides the prices in are out of date
I think.


Regards David

That RX8 oil metering pump adjuster is a clever idea Richard.

The best place is inject it into the fuel on the low pressure
side of the fuel pump. Mount the oil storage container high and use a
needle valve to control the gravity flow into a T in the fuel line.

Probably a better idea is to use a venturi in the fuel line so
the oil flow is proportional to the speed  or amount of the fuel flowing
through the fuel line.

Putting the oil in the fuel also means it lubes the housing better
as it is automatically distributed through out the housing.

BTW it is by no means certain that low apex  oil injection caused the
problems
with the early RX8 engine apex seals. The current thinking is failure of
one
or more ignition coils caused misses that washed away the apex seal oil
with
too rich raw fuel.

If you mix the oil with the fuel this cannot happen.

Paul Lamar

--

Looking at the picture are you suggesting it be gravity feed into the
fuel line?

Would it not be better to add it into the fuel line under a little
pressure from the Oil
Injection Pump System?

Wouldn't  that be a better option it would also make sure it mixes more
accurately with
fuel as it is being used and vary the amount based on engine RPM.

I guess a one way valve would be need to be installed ensure no back
flow of fuel into
the oil system not an issue to install though,  apart from that I think
it would work.
So it would have force feed oil into the line, yes?

Regards David

It at depends on the positions of the respective tanks.
It is easy to mock it up and see what happens.

Paul Lamar


---

I note another person asked this question,
which was what I wondered about in the first place.
how about just injecting oil directly into the intake manifold very
close to one of the
intake ports for each rotor ? with the controller this surely would be
good option?

Regards David

Mazda spent a lot of money coming up with a chrome surface so
the apex seal oil would spread out. Called Micro Channel Pores Chrome
Plating.

http://www.rotaryeng.net/1984-recent-tech.pdf

That is because they intended to inject oil directly into
the rotor housing thorough one hole for emissions reasons. The RX8 is now
up
to two holes per rotor housing.

Back in the old days of carburettors the oil went into the float
bowl. It worked well. I suggest going back to that method by
Injecting oil into the input side of the fuel pump. The high pressure
fuel pump will mix the oil throughly with the fuel. We know that
mixing oil with the fuel works well because if you mix too much it
survives the combustion cycle and winds up in the oil sump.
Obviously it is spreading through out all of the chambers.

As soon as I get this project done I am working on and I get
Mike Will's rotary powered RV4 flying again I will try out this idea.

Paul Lamar



Paul,

The other place to put it is in the header tank.
make a fitting to join all the lines into one, and run that to the top of
the header tank through a check valve.
Those without header tanks may need to use a check valve and put it in the
fuel pump inlet as you suggested.
Larry