While trying to find enough omp oil injectors for my new engine that actually work properly it occured to me ..... "I wonder how many rebuilt engines get put together with the old faulty oil injectors?" . I have 20 oil injectors here ...of those I found only 3 that were actually working properly . I know from previous experience that a faulty injector can cause an engine to lose power when it's in cruise mode for a long period . See link :https://www.rx8club.com/series-i-tec...speeds-264684/ .
So it stands to reason that if it's losing power from lack of lubrication , it's also wearing out faster.

Also found this which is from years ago basically saying the same thing so it's not really a new theory but still worth bringing up again: https://www.rx8club.com/series-i-tec...theory-210194/

If you look at a series 1 stock intake, you will see that the vacuum hose that feeds the oil injectors sits beside the oil filler vent tube . This vent tube pushes a lot of oily air into the intake right next to the omp vacuum line . So .... the oil injector is sucking in a lot of contaminated air and this will cause it to gunk up over time . Which in turn will lead to the failure of the check valve and then premature wear of the engine .

So I'm suggesting :
*always check the injector check valves before fitting them to a new engine
*check the injectors periodically and replace when the check valve is faulty
*Fit a catch can to the oil vent tube or relocate the entry point of the injector vacuum line such that it is upstream of the crankcase venting tube.

Pics to come ...once I get back home.

How to easily check the check valves :
Suck on the tube end of the injector and while sucking put your tongue over the hole . If after releasing the suction , it sticks to your tongue .... it's ok .

 

Wouldn't premixing from gas tank eliminate this issue?

 

I don't believe that premixing works as well as a properly functioning oiling system unless you are adding around 100:1 .Even at 100:1 , premix is not lubricating the corners as well as the omp does . Also :if you are adding 100:1 plus you still have your oiling system .... that a **** ton of oil going into your engine .

 

Has anyone put series 2 housing in a series one and used their own OMP to feed the other two injectors? (Actually do series 2 housing match up to series 1 plates?)

 

The RX-8: a car for people with high risk tolerance and no objections to occasionally sucking its vacuum hose.

But that's an interesting find, I shall have to pleasure my car soon.

 

As you will see if you click on the second link .... this isn't a new theory at all so I should change the thread title. The only new idea is what might be causing the injector check valve to gunk up and how to avoid it . I

 

That’s been my position for years and not just those parts either, but there are plenty of racers premixing without issue as there are OMP users. Yet at the same time there are plenty of failures in both camps too. Making sure the entire system works properly is paramount though if pre-mix is not being used. Obviously not enough lube regardless of which method is the worst case, guaranteed to fail scenario.