ElusivExGTUSxImage

with the 1989 Rx7 GTUs..wen your removing the Oil Metering pump will oil splash out? do i need to empty out the oil from the engine first? i dont really want to because i've just poured brand new Valvoline oil into it about a couple of weeks ago...any information will be greatly appreciated...thanx

BigTone

....ummm...I think you are going to have alot more to worry about than new oil. OMP is not very easy to reach without removing parts. And the OMP lines are harder and will require you to remove the TB and Manifold. If you are just going for just the OMP and dont want to remove anything I would go for it from under the car. Have fun and premix

SonicRaT

iTrader: (6)

Well, considering he has a S5, I doubt he's removing it just to block it off. So, just remove the 4 10mm oil injector line bolts, move them aside, then remove the 3 10mm's that hold it in place, you should be able to get to it fairly easily, then just pop it off. And don't worry about oil coming out, unless you overfilled it, you won't have an issue.

SureShot

... As long as he leaves it connected to the ECU.

The 89's ECU thinks the OMP is real important.
If he unplugs it, the ECU goes to "limp in" mode.

Mykl

There's a product somewhere, I lost the link....


Anyway, it's basically a block off plate that keeps the OMP on the engine, but instead of drawing engine oil it draws oil from a resoirvoir of your choosing. Which means you can run beer through it if you wanted to... but I'd use premix, myself.

Personally, I think that's the way to go. Too bad I don't remember who sells it.

1987RX7guy

iTrader: (3)

I think that is from rotary aviation.

Mykl

I'm surprised that it isn't a really popular, even encouraged modification for RX-7's.

ElusivExGTUSxImage

thanx for all the input guyz...well the reason y i want to remove the OMP is because my ECU is on limp mode...after revving to about 3000 RPM the fuel cuts off and the car stutters...a frend of mine has the same motor so im gonna try to swap the OMPs...is there a way to by pass this limp mode i hate it...to have a car that has soo much potential yet have one little thing holding it back really sucks lol...any wayz thanx again

Aaron Cake

iTrader: (1)

Because not everyone believes the metering oil pump is fatally flawed. Some of use actually respect the Mazda system, and have enough proof of it's effectiveness to believe that it basically works.

1987RX7guy

iTrader: (3)

And some of us have faith in the 787B that used pre-mixed fuel. ANd also have enough proof that pre-mixing is also effective.

twistedriver

PREMIX Premix PREMIX preMIX..............

SonicRaT

iTrader: (6)

Even better: Leave the OMP *and* Premix.

Aaron Cake

iTrader: (1)

Of course, the 787B is a pure race engine, not a street engine. We all know that RX-7s came from the factory with peripheral ported 4 rotors, right?

1987RX7guy

iTrader: (3)

Look we have differing oppinions thats all man. We both have no REAL proof of which is better. Unless we find some 80k dollars lying around to test a batch of new engines to see for sure. But anyways man. I would say both work. I just don't mind pre-mixing because it made my car: idle better, run smoother, and got me more MPG. And no problems have arisen from it. That is MY personal proof. But it is NO reason for anyone to DO IT. Its must MO

Aaron Cake

iTrader: (1)

I have lots of proof that the stock system works fine. My proof is in every RX-7 sold since 1978. My proof is in my own 250,000 KM abused engine that I tore apart. My proof is in all those shiny and beautiful used rotor housings that I have sitting around...

I'm going to stop now because the internal censor in my brain is shouting "don't continue....be nice!".

Relisys190

iTrader: (4)

lol Aaron!

"I'm going to stop now because the internal censor in my brain is shouting "don't continue....be nice!".

You guys are just too damn funny man. to tell the truth i love these online forum things.. just enough excitement and drama to keep my day going by.. and i get to learn things as well.

-Markus

"I PREMIX" May take alittle long while getting gas, and i'm sure people look and stare when i'm putting a bottle of oil in my gas, but BOO FUGGIN" HOO CHEERS!

ElusivExGTUSxImage

whoa!!! so what you guyz are sayin is that this method of *PREMIXING* is actually pouring a quart of oil into your gas tank? damn thats sounds like its gonna do sum damage or would it? how does pouring oil into ur tank help? someone please explain...im like totally lost here ......lol

Black13B

iTrader: (1)

I don't believe it's fatally flawed.

I do believe however that 4 stroke oil does not belong in the combustion chamber.

Preventing carbon buildup is all in maintenance and driving style. But IMO it's still pretty tough when your dumping 4 stroke into the chamber.

I've had a used 13B N/A torn to pieces, and it took me a very long time to clean the carbon off the rotor, and that was with a highspeed electric wire wheel.

I plan on rebuilding my motor in winter '04/'05, so I'm switching to premix to see if it makes any kind of difference over a whole summer of no MOP.

DraygenX

so since we're on the topic of premix, got a question. I've been told by a few people that you can NOT use premix in the 89 to 91's. any ideas why not.......

neptuneRX

not true, you can, but you can not disconnect your OMP from the ECU. on 88 and lower you can basically do whatever the heck you want because it's not linked to the ECU. with a 89+ I would recommend using both the omp and premix. Personally I'm with Black13B I'm going to rebuild around winter or fall of 04 (when I also buy my FD) and going to religious premixing and the OMP is coming out. along wiht other stuff.


on the topic though, are you suppose to use 2 stroke oil or 4 stroke oil when premixing?

DraygenX

not sure I see a reason in removing the omp and using premix besides the fact that there's some question on the factory's omp being reliable. is there something I'm missing here?

Aaron Cake

iTrader: (1)

Carbon buildup, carbon buildup, carbon buildup. That's all I seem to hear around here.... Well, it's an engine that runs on hydrocarbons. Of course there will be carbon buildup. I'd be more worried about the car running too rich and causing carbon buildup then I would about the marginal amount caused by burning oil...

There is no question...the factory system is very reliable. However, it is not adaquate for continuous high RPM operation. In that case, I would recommend to run some premix in addition to the factory metering oil pump.

razorback

you know what they use for chainsaws, weedeaters, dirt bikes, etc?? premix not motor oil into gas. that would be very bad. but hey if you try it then tell us how long it takes to **** up your fuel system '

search for premix. that will explain it.

DraygenX

well I think I'm gonna take the route of staying with my factory omp but I have come across some information on replacing the thermal pellet or something like that but I can't seem to find the site that I saw it on, anyone know anything about it ..

Wankel7

Blah, if you are worried about carbon build up just use water injection. Keep things nice and clean

Back on topic..............


Also, on that car of yours you said it pops and spits about 3000rpm. That does not sound like limp mode. It sounds like anouther prob. I would say your OMP is not the prob. Tell us in better detail what happens above 3000rpm?

James