Okay so I am in process of rebuilding my engine. I am sending it to Lucky7 to get built. I am getting the parts together. My plan is to run a S5 13B NA medium street port. I notice that a lot of threads i go to, people are talking about Pre-mix and OMP lines. I read that some people eliminate the OMP lines other people leave them. Does anyone have a picture of these lines? Can they be upgraded to something more durable? What is the benefit of running Pre-mix?

 

The S5 requires that the OMP be connected to the computer and be turning.

You could eliminate its oil reception... and then eliminate the lines. You would then need to premix your gasoline every time that you fill up. The advantage is that pre-mix tends to burn cleaner than actual oil. The disadvantage is that you (and everybody who buys gas for it) are now putting pre-mix in your car... and disabling a stock system.

You can easily upgrade/repair the lines to not 20 year old material. I used temp resistant nylon (1/8" id). This thread has some details for you https://www.rx7club.com/2nd-gen-archive-72/rebuilding-omp-oil-injection-lines-348068/ This is typically done because the old ones are brittle and break.

You could spend $30/line on Mazdatrix or get your local braided stainless steel guy to make you some hoses. or these: http://www.rotorsportsracing.com/per...g/OMPlines.htm

 

do you have pictures of the stock omp line?
and how many lines are there? I am pretty sure they broke when I took my engine apart.

 

4 lines stock, they start out as clear nylon lines but normally end up looking like thin black lines

they have a protective sheeting on them where they connect to the OMP.
This is what they look like new

 

So I will need for correct? I am already putting in money what's a little more to have piece of mind when it comes to them not tearing by buy SS lines.

 

well you can run pre-mix and put bolts to plug up the lines, but its nice not to have to premix.

 

i think i will just make the lines how the guy did on the archive

 

Some of us think it's nicer to know that the rotors and their seals are getting exactly the right amount of lubrication at all times. We also find it nice that we don't have to worry about a pump failing, lines breaking nor injectors clogging. Complaining about having to add premix at the pump is like complaining about having to wash your hair while taking a shower.

 

but what exactly is premix? is it oil you put in the gas tank?

 

Yup, just like with a lawnmower or outboard motor.

 

damn so every time in that pump i would have to put that in that sounds expensive

 

Its only a small amount per gallon, not sure of the amount needed but its not much.

 

its usually an ounce per gallon. ive ran pre-mix for almost 2 yrs now; its annoying and dirty but more reliable than 20 yr old pumps and lines....

 

And a waste of time, and it makes people look at you funny, and it can drip on your shoes, and you have to figure out how much to put in, and you have to carry a bottle and measuring device around. Each one of these is just a little thing, but it all ads up to annoyance.

If you don't want to premix, don't. Just test your metering oil pump as per the FSM instructions to make sure it is working, and then don't worry about it after that. They almost never fail. Next time you have your intake off, clean all the nozzles with carb cleaner and blow air through and they will be fine for another 20 years. Buy new metering oil pump lines while you are at it, they are cheap.

 

S5 omp are a little problematic since they are built on stepper motors. Sometimes the contacts are corroded and doesnt send the right voltage to the ecu and it will go into limp mode.

S4 omp are basically bulletproof since they are mechanical and not electrical like the S5 omp. As Aaron Cake said, they almost never fail.

I dont see any hassle in premixing. Been doing it for 4 years and everytime I get gas I do it like its second nature. Though when I go to New Jersey, they pump gas for you as its law, so when I tell them to let me fill my gas tank with oil first, they become puzzled and perplex lol.

 

most of you are going to blow your motor as a result that has nothing to do with the OMP at all

funny how many original engines go well over 150k, 200k miles with that pesky temperamental OMP system

some of us dont like to pour oil into the gas everytime we stop the car and get gas, or carry a funnel or cups around with 2 stroke oil in the trunk, or when your stuck in traffic to be puffing smoke like a old diesel train and suck the fumes in as well, some people like to be able to pass emissions as well.

some of us are not ALL of us, you premix thats great, but not everyone likes to do it.

 

dont mean to thread jack but if you remove the omp you wont pass emissions? im thinking about doing this....but the last post just made me seriously think about it!!! does it make a deference in between n/a and turbo?

 

I am keeping my pump but i still don't pass emissions. I am going to be running the RB road race exhaust and lets face it its not exactly smog legal but then again the best things to mod on your car are not smog legal

 

why did you decide to keep you pump?

 

well from what I learned from this thread I don't feel like putting premix in my car. So ill just use the stock oil pump and just use the archive thread to build new lines.

 

true sounds like a reasonable reason but i dont kno it would be kinda embarrassing to take that out all the time but then they also said it runs better?

 

I will admit my laziness. I don't feel like putting premix once i get my engine running. I want to just put 87 octane on my 13b na and just break that bad boy in. After having my car gone for almost a year I want to just drive it I don't feel like putting in premix and all that stuff. That's why I am going to run the stock pump and and just make new lines for it. It's just a matter of preference remember its your car no one on the forum can tell you what to do to it. If you want to paint it neon pink go for it hahaha

 

I dont know if this was proved or not but I read somewhere awhile back that premixing will start to remove carbon build up over time and typically an engine that is pulled apart that ran premix will be cleaner then an engine that didn't.

don't flame/quote/hate/sue me

I never said any of this ^

 

So how is the way someone looks at us supposed to affect what we do? Gas can also drip on your shoes and it's pretty easy to know how much to put in. You don't need a measuring device because a little more or less won't make any difference. Everything in the first part of your post ads up to you being a troll. I know you're not and that's why if you disreguard the first part of your post, it's good advice.

We all know that some people like to premix and some don't. This has been covered numerous times and with a little searching, you can find out the pros, cons, and why Aaron thinks it's stupid.

 

Based on what? What does this have to do with premixing?


Ditto without. No one has said that the omp is a guaranteed time bomb. A part will fail when it fails. I consider the omp to be a more delicate system with those lines, and especially the s5 omp - mine failed and cooked part of the ecu when it died.


There's no need for a funnel if a long-neck bottle is used, like the MMO bottles, which are also perfect for carrying two tanks' worth of premix.



A funnel isn't needed because the trap door doesn't have to be open for the oil to reach the tank. I've never used one. I keep two of those MMO bottles (the one pictured on the left) in the car and that's it. It only takes about 15-20 seconds to add 16oz of premix before fueling. I suppose your next complaint will be that this is far too long to wait.


a) you'd have to premix at a retarded ratio to produce visible smoke at the tailpipe

b) premix burns cleaner than engine oil, if anything switching to premix slightly stacks an emissions test in your own favour


Thanks for posting all the misinformation. It's good to put it out there to help the uninformed make an important decision.