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Index > Engine/Drivetrain > Thread: Series 5 fuel injected motor into REPU
Thread: Series 5 fuel injected motor into REPU
Tom93R1


Redlining
Posts: 458
posted September 01, 2005 02:05 PM

Series 5 fuel injected motor into REPU

So I got a great deal on an 89-81 motor and all accessories. The motor has a bad water seal but otherwise is perfect. I am going to rebuild that and put it in the REPU. My original plan was to go fuel injected but due to time constraints I ended up with the Weber.

Any way, I was looking for suggestions on what to do for the OMP. Currently I have been pre-mixing and had nothing. Having to use the old 12-a front cover I would think means I wont be able to use the electric OMP off the new motor. I really dont want to continue pre-mixing. Is it possible to plumb a 12a OMP into the newer motor? What would you guys do?
thanks
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted September 01, 2005 04:17 PM

Mind you I have a very limited experience so take this for what its worth.

The wiring harness/plug coming off the electric OMP goes through the ECU. When my OMP (bad potentiometer) went bad last month I went through the testing procedure which included tracing the wiring.

So I think that trying to use the electric OMP is going to REALLY be an engineering project (I could be totally wrong) as it seems tied into the ECU (there's two power leads and four that go to the ECU).

I actually considered putting the mechanical OMP from an S4 on my '91 cause it scares me to think the electric pump could fail and starve my engine for oil.

A friend of mine has his set up this way so I know it works, my only concern is that I imagine Mazda had a reason for going with the electrical over the mechanical. It might be as simple as more accurate metering and less oil consumption, but that's strictly a guess.

Most people don't realise that the majority of oil injected into the housings is actually reclaimed, not comsumed. So why they went from mechanical to electrical is still a mystery to me.

I know its not a lot of help, but I hope there's at least some information somewhere in that mess for you :)


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

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bwaits


Hauling
Posts: 119
posted September 02, 2005 05:31 AM

Since you went weber I assume you are not using the stock ECU. With a 12A front cover you can use the 12 OMP. You can either drill and tap ports in the lower manifold or have special lines made that have slip on ends at the OMP side and the banjo fittings on the engine side. I have a dellorto setup that has the lower manifold tapped for the OMP lines. They are 1/8"NPT fittings with barbs on the ends. The stock 12A lines runs up and just push on the fittings. The later model stuff had fittings on the housings. These had the banjo ends as well as a vacuum line going to them. The cleanest install would be tapping the lower manifold IMO.

-billy
____________
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klaus42


Rotorhead
Posts: 1877
posted September 02, 2005 09:10 AM

Does a manifold tap...

...result in 'proper' fuel/oil mixing... or is this not an issue? Or, is it actually preferable to have it less mixed, perhaps entering from along the bottom of the runners?

       
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Tom93R1


Redlining
Posts: 458
posted September 02, 2005 02:21 PM

I was searching the r7club 1st gen section and somebody mentioned you can fabricate an adaptor plate to mount the S5 OMP to the 12a front cover. I hope to tear the S5 motor apart this weekend and I think I can have access to another 12a front cover. I will let you guys know how adaptable things look.

Thanks for the suggestions, keep them coming!
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted September 02, 2005 02:29 PM

Cool. How you getting around the ECU issue?

Looking forward to your findings.


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

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Tom93R1


Redlining
Posts: 458
posted September 02, 2005 02:44 PM

ECU issue? I am not sure I understand. I have a complete wiring harness and ECU from the new motor. If I figure out a way to use the electric OMP then there shouldnt be any ECU issue, or is there something I am forgetting?
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted September 02, 2005 03:20 PM

quote:
ECU issue? I am not sure I understand. I have a complete wiring harness and ECU from the new motor. If I figure out a way to use the electric OMP then there shouldnt be any ECU issue, or is there something I am forgetting?


The wiring for the electric pump runs through the ECU but you're going to go carby right? I was just curious how you'll work around using the electric pump w/o the ECU.

Not a backhanded challenge or anything, I'm seriously interested in what you find out.


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

        Click here to visit rotormunky's homepage. 
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Tom93R1


Redlining
Posts: 458
posted September 02, 2005 05:37 PM

Ah, I get it now. Actually I am going fuel injected. Right now I have a Weber carb on the REPU but I always wanted to be fuel injected. I love the sound and simplicity of the Weber but when it comes down to it I could get the power I have now and it would be alot nicer to drive if I were to go with fuel injection. I have the entire engine, fuel system, ignition system, everything I need... I think.


____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted September 02, 2005 07:35 PM

Ah, then I think I too get what the real problem is. You got a 12a front cover on there for mounting purposes, and the electric OMP doesn't easily mount.

God, it only took like what? THree days for us to understand each other? You'd think English was our first language or something! :) LOL

Well crap, then I have no help for you on that one at all either!

I guess the 12a pump is radically different? I'll stop muddying the waters now :)


____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

        Click here to visit rotormunky's homepage. 
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Tom93R1


Redlining
Posts: 458
posted September 02, 2005 08:47 PM

Congrats, you got it! Hahaha, but yeah, that is the situation. I dont have the new motor apart yet to see how big of a difference there is between the 12a mechanical and the 13b electric but I can only imagine it wont come anywhere near being a direct swap.
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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klaus42


Rotorhead
Posts: 1877
posted September 03, 2005 09:50 AM

Perhaps you'll be the one...

...to machine an adapter? (Pardon my ignorance if this would be impossible... I know zero about the electric OMP... just a thought!)

       
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rotormunky


Redlining
Orlando, Florida
Posts: 424
posted September 03, 2005 10:07 AM

I remember that the pump has a little shaft that sticks out and fits rather carefully into the front housing. That may also be an issue, so it might not be as easy as a bolt pattern.
____________
-Martin
Orlando, Florida

http://www.themonkeyhouse.org/REPU

'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)

        Click here to visit rotormunky's homepage. 
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WPGREXX


1st Gear
Posts: 20
posted October 11, 2005 09:34 PM

you just need a 12a metering pump and lines, that should solve your issue.
____________
75 REPU, 13b streetport Dellorto 48mm, 2.5 exhaust, custom extended cab
86 RX7 -in restoration process, T70 Turbo

We build amazing Engines

       
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Tom93R1


Redlining
Posts: 458
posted October 12, 2005 03:50 PM
Edited By: Tom93R1 on 12 Oct 2005 15:51

Can I plumb a 12a OMP into the S5 13b OMP injectors? Plus I would still need to connect the linkage and trick the ECU into thinking the electric OMP is still there. This project is on hold since killing a coolant seal on the FD on my drive to sevenstock. I should have plenty of time to think about it now.

____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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WPGREXX


1st Gear
Posts: 20
posted October 23, 2005 08:51 AM

why are you planning on running the s5 ecu and fuel injection? I would not if it were me. Get a carb and run a distributor. Than you can use the 12a front cover and have the oil lines going into the 2 oil fittings in the manifold, and put a bolt in the 2 oil fittings on the block. Also block the fuel injector holes with RB plugs or Devcon it in.
____________
75 REPU, 13b streetport Dellorto 48mm, 2.5 exhaust, custom extended cab
86 RX7 -in restoration process, T70 Turbo

We build amazing Engines

       
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rxkevin


1st Gear
Posts: 45
posted January 31, 2006 07:30 PM
Edited By: rxkevin on 31 Jan 2006 19:31

quote:
I was searching the r7club 1st gen section and somebody mentioned you can fabricate an adaptor plate to mount the S5 OMP to the 12a front cover.


I wasn't able to find the thread. Do you have a link or any more info on the adapter plate?

Thanks,
kevin


____________
1984 RX-7 with 1993 13b rew drive train, t-66, power fc.
1974 REPU dellorto, racing beat header, 3 spd auto

       
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