Wow. Deep. I like the chop sticks.
How are you going to measure flow?

Haven't thought about it much. We'll see what happens with the in-vehicle tests.

now THIS is my type of frabrication! I just wish I knew more of what I was doing like Del here!~
olddragger

Well you can see from the quality of the picture that I'm as technology challenged as you are. It started at about a 500kB size which is more than double what is allowed. I cropped some of it in Word, copied and threw it into paintbrush, and then resaved to magically be just a couple of KB under the limit. Your son would laugh his head off. Maybe next time I'll just email the original to him and ask him to deal with it.

I love "found" tools.
It took me a lot of years to stop reaching for kitchen cutlery rather than legitimate tools...

well i go t the pump that was sent to me apart and got really good pics. This time I used a dreme to get all the parts separated.
MM you still have to show me how to disassemble this thing without destroying it.:)
Pics are too large to transfer over so I have to load them again somehow.
But in a nut shell --the sock was clean
the filter itself---Good Lord!
its a 100k pump assembly/filter with 32K using premix. You will see what i mean.
olddragger

ok here is a try https://www.rx8club.com/attachment.p...1&d=1188608726
look at them and see what yall think
olddragger

OD you need to post them all separately, they are too small to see clearly.

click on the link
see how the oily nasty stuff was easily wiped off?
the filter was n bad shape.
keyboard messing up spilled beer!! cant type much:(
OD

Try Febreeze.

OD, have you done any checking to see what the dirt on the filter is? Does it look remotely like rust? I am trying to understand why your gas may be dirtier than ours.

Charcoal.

Does anyone have an ECU pinout diagram? I looked for an RX8 FSM online and couldn't find one. How many output channels does the OMP use-4?

Its in the engine control section of the FSM.

the black stuff being wiped off looks and feels like oily graining stuff---i didnt taste it nor would any of my family volunteer---cowards!
olddragger

If you use enough pre-mix, you can smoke just about any car, no matter how large, as long as it is downwind.
It'll run you about $5 a quart.

I have always maintained that my car uses about 1 quart per 3,000 miles. But that's an extremely rough estimate based on how much I'm down between oil changes.

Since I use the sohn adapter, and have a container that I can meter, I now know exactly what my car is burning.

On 9-01-07, I filled up my washer fluid bottle to the top marked line. The distance from the top line to the bottom is exactly one quart. My car had 45,800 miles on it.

Today on 10-31-07, my car has 46,800 miles. I checked the washer fluid bottle and I'm below the bottom line.


https://www.rx8club.com/attachment.p...1&d=1193838620

So in exactly 1,000 miles, I used about 1.2 quarts of oil.

I have the original omp, no modifications besides the sohn mod (which shouldn't change the flow). I do drive like a banshee though.

^ That's why.... a wild indian always burns more oil.

Controlling the RX-8 OMP
 

Great thread!!

I've been scratching my head on what to do about the OMP for some time now. I'm in the early phases of attempting to put a renesis in a 2nd gen and planning to use megasquirt to run things.

I'd really like to update the megasquirt code so it can drive the OMP as well. So from what I've come up with we are dealing with a Two Phase Uni-polar stepper motor.

Yellow = A1
Red = A common
Blue = A2
Black = B1
Pink = B common
White = B2


Sensor Switch pin 1-3 normaly closed but open at "max" flow.

Very, very interested in motor position observations reveal during your road testing.

So are you saying that with the Sohn adapter your oil consumption rate more than tripled?

Yes with regard to motor type, connector colors (but colors don't match on harness side according to my drawings and note that common means battery) and switch opens, although not necessarily on max flow but somewhere between step 53 and 60. I recently measured the piston/cylinder displacements with step position and will be providing that information soon.

I've measured the stroke lengths of the two cylinders in the MOP as a function of the stepping motor step number. The results are shown in the first graph. The remaining graphs are based on calculated theoretical discharges.

More good work!! I've got a sohn adapter I think it's worth the effort to build a little test stand and spin the pump at a fixed RPM with a small electric motor to get some real measurments from the running pump at various step positions.

These reports of higher oil use with Richard Sohn's adapter vrs when using sump oil is a bit concerning. Maybe someone who knows what the oil galleries on the block do can chime in? Perhaps in the test stand tests I can raise and lower the oil supply tank to test the effect of head pressure. I'll bet Richard would have something to say about this I'll fire him an email and report back his response.

Perry

Perry:

I wrote Richard with this question:
Thanks for the seal information Richard, but what about the oil pressures. Your adapter requests a minimum of 6" of oil head. What pressure does the inlet of the pump see without your adapter?
His response was:
This pressure has not been measured, however, the oil enters the OMP right at the outflow of the oil into the oil pan. This can only be visualized on the actual hard ware, since a real picture of it does not exist to my knowlege.

The pump is positive displacement and it delivers oil to each outlet separately. A cam forces oil out, and if you tried to stop the flow - well pressures would get pretty high. Oil suction is by virtue of a spring pushing the pistons and cylinders apart. The effect of external pressure is one of helping the oil to flow into the cylinders.

It would be interesting to see how well the theoretical and actual oil flows compare. A sohn adapter will sure simplify the experimental setup.