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Old 08-07-01, 06:40 PM   #1
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12A to 13B engine swap...


I have a 85 RX7 12A with a 5spd. What things will have to be modified to put a 13B in it. Do they use the same 5spd tranny, engine mounts, etc...
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Old 08-07-01, 09:25 PM   #2
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The '86 13B used the same tranny as the -SE. AFter that, I think they changed it.
A 13 B engine will bolt up to your transmission. You will need a oil pan from a GSL-SE, because one of the motor mounts will be on the side not the front. I think you also need a different front housing.
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Old 08-08-01, 08:43 PM   #3
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thanks for the advice, but are you saying that the only engine i could swap in is the 13B from a 86 or that the trannys would have to be swapped too from anything older than 86?
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Old 08-08-01, 11:21 PM   #4
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I think its like this.
The '86 used the same tranny as the '85 -SE. However, any 13B engine will be a perfect match to any 1st gen tranny, EXCEPT the 13B turbo. They used a different tranny and different bell housing pattern. Keep posting and consult a mazdatrix calalog or www.mazspeed.com; ultra garage, for more information.
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Old 08-09-01, 03:41 PM   #5
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Not to be rude but your wrong about 13BT it will bolt to a first gen trans. a 20B will not.
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Old 08-09-01, 06:12 PM   #6
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Kinda same thing here:


I want to put an '84 GSL-SE 13b into my regular '84 GS, How much work would it be to swap it?

(i'm new to the rotary scene... I know very little about rotary engines... about the same ammount as a rock )
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Old 08-09-01, 10:38 PM   #7
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thanks for the advice guys, anyone want to explain the process of a rebuild on a 13BT since my knowledge of V8's means nothing here, an idea of what to do would be nice

Brian
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Old 08-11-01, 03:33 PM   #8
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just pick up a j-spec 13bt way cheaper than building it yourself unless you have the $$.

and any 13b can fit in a 1st gen you just need a gsl-se oil pan and front cover, plus racing beats 13binto12a frontmount bar...

ps all rx7 trannys have the same bolt up pattern it just the flywheels when things get interesting...
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Old 08-11-01, 04:44 PM   #9
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Who do you go though to find a j-spec 13bt?
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Old 08-11-01, 06:47 PM   #10
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corksport sells them for 850 for 88 year ones and 950 i think for 89+. i dont know if you would want to go this route with the motor unless you use the block for n/a cause it can be a pita to get everything hooked up in a first gen..
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Old 08-12-01, 02:34 PM   #11
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hmmm If i did the swap I would want the turbo for sure and i wouldnt be positive if i would, have to be fuel injected, but it would be nice.
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Old 08-12-01, 11:09 PM   #12
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Quote:
Originally posted by Turbo FB.
Not to be rude but your wrong about 13BT it will bolt to a first gen trans. a 20B will not.
Cool, I wasn't so sure of that either, but the TII tranny is not a direct bolt on to an N/A engine, correct? I'm pretty sure you can't use a TII tranny on a 13B OR a 12A w/o some modifications. The only different trans. that will work is the coveted GTUs close-ratio.
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Old 08-14-01, 11:09 AM   #13
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All 12 & 13 series motors have the same bolt patern its just a mater of the corect flywheel clutch combo.
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Old 08-29-01, 06:44 PM   #14
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more questions;

If i got a J spec engine would it come with the proper computer equipment, since it is going from a carb to FI. And where exactly would i go for the flywheel, junkyard searching or anything better?
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Old 08-30-01, 10:14 AM   #15
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When you get you motor it will NOT come with the comp. All your getting is a (complete) engine. Youll need to source the other parts, I found this to be the most difficult, you put adds up looking for your parts and you get a 10 to 1 deadbeat ratio.

What is your budget?
What trans are you going to run?
If stock 12a, Iv got an extra flywheel.

For the clutch/flywheel set-up tell me what year motor & the year and type of trans and ill tell you wich flywheels you can run.

Plan on about 2K not counting Trans.

Last edited by Turbo FB.; 08-30-01 at 10:17 AM.
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Old 08-30-01, 11:49 AM   #16
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Im still planning for the swap, trying to get a firm idea of what is required. I plan on putting in around 2k into the car,give or take, but thats not till later this year. I will probably run the 12a tranny if i can get away with it. The car is an 85 with a 12A, and i want to go to a 89 13BT engine.

Last edited by rx7slider; 08-30-01 at 11:52 AM.
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Old 08-30-01, 01:34 PM   #17
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Have you visited my home site?

I have the flywheel you need 86NA $40. + shipping
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Old 08-30-01, 09:44 PM   #18
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I havent visited your site, and would a 86 NA flywheel be the right choice for the 13 BT?
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Old 09-06-01, 10:04 AM   #19
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If you want to keep the stock trans. Its going to be 86NA or aftermarket.
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Old 09-06-01, 12:27 PM   #20
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Thanks for the advice, ill be in touch soon for the flywheel, I'll go through your web site.
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Old 05-25-09, 01:30 PM   #21
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so even a 88 13b-T will fit into my 1983 12a fb?
only things I will have to adjust is oil pan and the 12ato13b set up kit.

cause I think I just might buy the whole j spec engine swap when I save some mula.



now anyone know how i could possible mount a Front mount intercooler as well?
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Old 01-02-10, 11:37 AM   #22
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hey guys, will a 12A gearbox bolt upto a 13BREW? Cheers.
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Old 02-20-13, 08:05 PM   #23
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85 gsl swap 89 turbo

hey guys
ok so ive swaped engine and trans got racing beat front engine mount and oil pan and fabricated trans mounts so good there gutted car welded roll cage and started wiring got ecu under passenger floor board got it down to 20 wires and rewired all lights and etc. installed 15 gallon alumin fuel cell

questions:
from what ive read the required fuel pump is 110 psi? is this true and where do i get one after market.

also drive shaft what the hell do i do here ne one got spec on one so i can get it made?

next wiring diagram would be great just need to know the necessities for the enigine plan on installing push to start

finaly is my rearend good enough ive been told to put a ford 9 inch with locking dif is that advisable or what are the options ?

thank you very much for your help
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Old 02-20-13, 08:05 PM
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12a, 13b, 13bt, 50, engine, fb, fit, motor, rotary, rx7, spec, swap, to, trans, transmission, tt, turbo

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