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Index > Engine/Drivetrain > Thread: RX7 to B1600
Thread: RX7 to B1600
KiwiMatt


Newbie
Posts: 2
posted April 22, 2003 03:50 PM

RX7 to B1600

Hi There
I'm from New Zealand and as most of you know we weren't fortunate enough to get the REPU out here. I'm currently wrecking an American RX7 S2 GSL for parts for a B1600 conversion, and I have a few questions. I am taking as donor parts the following, Engine,crossmember, engine mounts, transmission, brakes + booster, Rear differential gears. Are there any other parts that I should be aware of? It looks a fairly simple conversion has anyone in your forum had to cheat like me rather than own a genuine model, any advice or tips would be greatly appreciated. This is a fantastic source of information on these incredible vehicles, keep up the the great work.

       
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Klaus43


Rotorhead
Posts: 1259
posted April 22, 2003 11:14 PM

Don't know much...

...about alot of the specifics of your swap, but the rx-7 rearend gears strike me as irrelevant. I say this because the REPU rearend is by far the heaviest-duty ever offered in a rotary powered vehicle, with the old rx-4 wagon ones (and this includes aspects such as axle diameter) being the next-most badass, and everything else being considerably lighter. Of course, if the rx-7 12A is what you'll be running, it might not matter so much... but the B-series ute still weighs more than the seven, and if you'll ever be hauling anything, well... Just my two cents...

       
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KiwiMatt


Newbie
Posts: 2
posted April 23, 2003 12:08 AM

Diff gears

I am retaining these in order to have more top end as I intend to use the ute for the occasional long distance trips. As far as I'm aware the B1600 runs a 4.4:1 ratio whereas the 7 has a 3.9:1. Are the internals interchangable, the B1600 has 30spline axles whereas the 7 has 24 or 26 spline axles. I'm after the ring gear and pinion. In regards to the engine I have the 12A S2 Rx7, which I am porting to a stage 2 (Longer & Wider factory ports). But I am more than open to suggestions. Thanks for your help so far.

       
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Uncle-Jim


Revvin Up
Posts: 64
posted April 23, 2003 09:42 AM

You might try Felix Miata's website or email him directly.
http://members.ij.net/mrmazda/
Also try the Mazdatrix site. From reading their info, it sounds like the Repu diff is a unique unit.
https://www.mazdatrix.com/
However, I would not hesitate to open up both pumpkins and compare parts. I've found lots of Mazda parts to interchange. I believe the pinion gear shaft from the '7 is longer than the 'ute. I wouldn't be surprised if you could make this work with the help of a creative machine shop.
I have 3.90 gears in my Repu, and I find it is a very good ratio for the hiway. If I am towing or hauling a heavy load I have to gear down and go slower, but 90% of the time, it's just fine.

____________
Uncle Jim
72 Rx-2 Show Car; '77 REPU (250K & goin' strong) 2 - '76 Cosmo's

       
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Mikkaz


Newbie
Posts: 6
posted May 19, 2003 03:17 AM

Half way there myself on a simular conversion.
I have started off with a 1969 Mazda 1500 Ute ( looks the same as an american B1600 ute).

I have everything in place to tear it down and do a full rebuild with an rx4 motor and box, front suspention from an 1980 b2000 ute (disk brakes).

i would love the pront panels of a genuine repu but their just not available over here in Australia.
____________
If it aint broke,,,you aint driving it hard enough

       
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ynot


Newbie
6th Gear
Posts: 10
posted May 19, 2003 03:55 AM

REPU in Auckland

Hey Kiwimatt, if your ever in Auckland I've got a 77'REPU to look at if you want.
Check out www.kiwi-re.com they could be a help to you.

        Click here to visit Ynot's homepage. Click here to send Ynot an AIM message. 
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KillaB


Newbie
Posts: 8
posted May 27, 2003 04:10 PM

quote:
Hey Kiwimatt, if your ever in Auckland I've got a 77'REPU to look at if you want.
Check out www.kiwi-re.com they could be a help to you.


Heard via the grapevine that this kiwi-re REPU is a mighty fine example.

       
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