I know what the oil metering pump does but my question is how does it do it?

I looked it up in the factory service manual and there really isn't any information there about how it works.

The main question that I have is: Does it require a pressurized source of oil?

 

Yes it does, hence the name pump. It pumps oil to the motor, which sends it to the injectors at the appropriate times.

 

I have several used oil metering pumps...

Does any one know how to test them? ohm readings or other wise? Jesse

 

This does not answer my question.

I know what it does, believe me. Unless I misinterpreted what you wrote, you just described what the OMP does.

The question is:
Does it require a pressurized source of oil?

From the oil diagram of the FSM, the OMP gets the oil almost at the end of the line from the oil pump. Still, there must be some oil pressure at the point where the oil enters the OMP. Is that oil pressure necessary for the OMP to funtion properly?

This is my question

Does anyone know????

 

Sorry, I didn't understand the question. I don't really know the answer either. If you were really bored you could pull the pump, start the car, and see if oil comes out.

 

Well, from what I have seen when taking my UIM off, it seems that you must hook up a vacuum source to the oil injectors. I guess that way, the more boost you have, the more oil injected...but I don't know if that answers any of your questions

 

WTF????

 

the omp will draw oil with only gravity feed .A tank should be 6 inches above the omp.Garfinkle feeds his omp 2 cycle oil from a tank he made .Does this help you answer your question

 

Not really.
The bit about the tank ebing 6 inches higher is based on the recommendation by the guy who makes the adapter for a separate oil supply for the OMP, I believe.

 

I think the hoses to the UIM are for oil vapour (emmisions) removal.

 

The oil is pressurized, because if it wasnt then the oil would not be able to defy gravity and travel around the water pump and go up into the oil injectors. The electronic oil metering pump is not very simply in design. You cant run the stock omp with a haltech. It also has a feed back to the ecu so the ecu will know if its bad and trigger a check engine light. Happend to my friends TII.

 

bump...

 

Mr. Stock,

If I go ahead with the engine replacement next week, I'll will remove the OMP from the engine block and start the engine to see if pressurized oil squirts out of the block ;] If it doesn't, I'm buying the OMP adapter plate so I can run a separate tank for pre-mix.

 

If you could somehow measure the oil pressure at the point where it goes into the OMP, that would be very helpful.

BTW, just looking at the oil diagram of the FSM, it appears that the OMP is fed last by the oil pump.

 

I believe it works on vacumn.

The suction of the intake cycle helps to suck it up to the chamber. The pump just gives the oil a little shove to the lines so it can be picked up by the vacumn and assures that the oil will be there to get sucked.

Scott

 

Well, I guess you gave it a shot. But do you own a third gen? If so, how would boost affect your theory. At positive pressure of boost, wouldn't oil be pushed out?

I guess your theory doesn't hold up to scruitiny.
Thanks, anyway.

 

Yes I do have a 3rd gen.

When I suspected my OMP going bad I called Dave(KD) and asked him how i could do a quick test.

He said to jack up the car and disconnect the lines from the OMP. Next, crank up the car. With the car at idle no oil should come out. He then said to rev up to 1500 RPM's and I should see drops slowly coming out. I did and it did.

I didn't ask him how it worked just how to test it. He also said under normal driving, if it failed the engine would last about 6mos.

My thoughts from this. At idle the engine the engine probably uses vacumn to supply the oil and under boost it gets what it needs from the OMP.


Like Gorden said e-mail Dave at KD he will be more than glad to help you.

Scott