majjic

Hi Guys,

As you might know I've been on a rebuild mission, fun fun fun... Anyway while in the process of diagnosing why I cant get her started we came accross some very sad looking injector lines (4 clear plastic hoses that run from the oil metering pump to the top of the rotor housings). My car has in the past had many cooling issues prior to me buying it (cracked radiator and coolant in the rear rotor housing), but that is another story..

Anyway these hoses have been so hot on the engine that they had shrunk to the point that little or no oil was getting through them!(Vacume pressure gauge confirmed this) Also very brittle. Not to mention that this was also assisting in my starting issues.

Cheers

ASH8

Yep, sadly an issue that too many overlook, these MOP to Injector lines don't like the heat and go brittle.

auzoom

I remember reading the original thread on this issue but cant find it. Was the topic of changing these lines to say SS discussed?

auzoom

OK found the thread https://www.rx8club.com/series-i-tech-garage-22/possible-new-renesis-engine-failure-theory-210194/ Just gotta see if they discuss alternate lines now.

MattRX

Hi Majjic

http://www.rx7club.com/showthread.ph...ght=omp+teflon

Hope this helps

I need to replace the line on my RX7 while the engine is out. I had forgotten, thanks for the reminder.

CYA

Matt

Mazurfer

Yes, I think later on in that thread alternatives may be discussed. If not, then at least it gives part numbers and some pics/diagrams for those interested.

GK1707

iTrader: (10)

Bump, anyone know the size of the barbed banjo fittings for the omp lines? Mine seem brittle as hell and I wanna make new ones with new banjo fittings as well as lines.

JimmyBlack

From memory I think Slash128 did this on his turbo build thread using braided SS lines.

According to Atkins the same banjo is used for both rx7 and rx8, so the following should have all the details you need:
Rebuilding the OMP oil injection lines - RX7Club.com

FunRun8

iTrader: (5)

Um GK1707 in the process of doing my lines I discovered that the banjo connections on the injector end have tiny one way ball check valves in them so not just ANY banjo fitting will work. This is the flow back prevention not the injector itself. That's why they have a sleeve extension that extends further from the banjo fitting and not just the nipple on the end. If you were to cut off the barbed nipple at that sleeve you'd see that the barb is actually installed with some sort of high temp epoxy making it an insert to seal and bond after the ball bearing has been installed. blow air or cleaner through them and you'll see it only travels towards the engine, be careful though it'll blow back in your face trying to blow back towards OMP direction. Don't ask how I know?

9krpmrx8

iTrader: (46)

Using anything but stock OMP lines makes no sense.

FunRun8

iTrader: (5)

Well I strongly disagree with that statement, I think the opposite is true, they are too critical to go back to the expensive junk Mazda is offering. Soon I'll be posting a much better alternative we'll be offering to give longevity likely beyond the engines life and into the next engine. They will significantly reduce the possibility of line degradation as is being postulated regarding ethanol fuels that then produce carbon deposits, allow inspection of flow not only visually but mechanically with an easily removed line but never having to be concerned about the lines under the manifold again.

Hard to buy that sort of piece of mind, I know it is for me, and we should be able to offer this upgrade for slightly less then stock lines initially with a much greater confidence in no more problems going forward, just one more weak point shored up and now more important than ever with more aging 8's needing both engines and or at minimum new lines at this point.

9krpmrx8

iTrader: (46)

The factory OMP lines are good for 100k in even the most harsh environments. Far past the typical life of a Renesis. There is a far greater chance of homemade lines failing. But of course if someone wants to risk it then I am all for it. I have tried all kinds of **** on the RX-8 but the OMP lines work just fine for many many miles.

BigBadChris

iTrader: (4)

I think there is also something to be said for the clear lines themselves. Its pretty easy to see if you have a blocked or kinked line. If you go with something else, such as stainless steel braided, you lose that functionality.

JimmyBlack

I'm looking at braided stainless OMP lines on my current (first) rebuild, as they'll stand the heat better if I end up moving to a top mount turbo setup. Braided lines will also take knocks a lot better than brittle plastic during engine install and work. I'm pretty good at dropping tools in bad places and one of these days I'll prob drop that socket handle onto an unlucky OMP line, at which point I'd be happier with braided.

My personal view on clear lines is that they're not much of an advantage. I don't believe a blockage would be visible with clear lines as the line would still be full of oil after the blockage - no way for air to get in. The only way you'd have a visible indication of a problem on a clear line is when the line is cracked/broken, at which point oil would leak out, making the break visible without needing to look at the clear line...assuming you're periodically inspecting the lines (I don't as much as I probably should).

OMP lines are a critical part of the engine, so if you're stepping away from OEM you need to be certain you're doing it right.

9krpmrx8

iTrader: (46)

The problem with SS lines in general is that they are very abrasive, So year of them rubbing up against stuff, especially aluminum will cause issues so using ss ptfe hose with an exterior sleeve is a must. It's not very flexible though.

ShellDude

iTrader: (12)

So wrap em in wire wrap.

9krpmrx8

iTrader: (46)

Or just buy OEM ones and not have to *** with it at all.

ShellDude

iTrader: (12)

if you're going to dump all that money then you might as well just buy SS ones.... that is my point.

9krpmrx8

iTrader: (46)

But SS offers no advantages so why bother? I don't think $200.00 is a lot of money for such an important part. SS lines are only as good as the hose and fittings used so there is a risk in going that route. But of course if people think a SS line is better then that is cool but it is rare that an RX-8 owner will out last a new set of stock OMP lines.

ShellDude

iTrader: (12)

They have a lifetime warranty, Scott ...

FunRun8

iTrader: (5)

Except that you may get longer life from the engine IF your OMP lines aren't failing prematurely without your knowing it, by either blockage or cracking or hardening and narrowing, etc..

There is a much better alternative to both SS and plastic for about the same cost, slightly less actually in the case of OEM. I offer hybrid lines, which incorporate both in the critical areas but doesn't use either entirely, far more reliable. look quite trick as well and will eliminate line constriction due to heat shrinkage.

9krpmrx8

iTrader: (46)

But if there is a problem you may not catch until it is too late.


If you are offering a product then you need to be a vendor. But as I said, the stock lines last a very long time without issue and replacing them with new OEM lines is the smart move.

FunRun8

iTrader: (5)

I have not displayed any ads, pictures, pricing or links, merely mentioned the fact that there are alternatives one of which I happen to produce, there have been numerous mentions of other alternatives in this thread as well but even with links.. Do other companies not make money off of their production whether or not member assembled? Even if only in supplying materials from their reference and referral?

9krpmrx8

iTrader: (46)

Well you are being subtle but have mentioned that you offer a product a few times now in a couple of OMP line related threads. Others linking to others is one thing, advertising your own product is another.

dannobre

iTrader: (3)

So far there isn't an issue......

I think the issue isn't as large as some think....but that being what it may there is always room for improvement