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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Fri Oct 19, 2012 8:39 am 

Joined: Thu Aug 13, 2009 7:27 am
Posts: 350
Location: salt lake city
great looking refresh!

question for you: is there a way to tell the difference between the turbo transmission and the non turbo transmission for this car/engine?

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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Fri Oct 19, 2012 3:09 pm 
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Joined: Tue Jun 10, 2008 3:55 pm
Posts: 406
Location: Auckland, New Zealand
derek wrote:
is there a way to tell the difference between the turbo transmission and the non turbo transmission for this car/engine?

12AT gearboxes have a vent on the bellhousing, similar to the later 13B turbo ones.

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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Fri Oct 19, 2012 3:29 pm 
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Joined: Sat Oct 31, 2009 11:53 pm
Posts: 408
Location: Adelaide
Did you just clean up the fan, or paint it? Or is it NOS one.engine looks good enough to eat off! 8)


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Fri Oct 19, 2012 5:24 pm 

Joined: Thu Aug 13, 2009 7:27 am
Posts: 350
Location: salt lake city
Thanks orion. Unfortunately the trans that came with my 12at has no vent. Just a grommet at the bottom.

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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Fri Oct 19, 2012 6:31 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
As per what Orion said, there's a vent on the side

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and no the fan isn't new it's just in very good nic and had a good clean
and i have given the viscous a very light bead blast so it looks like natural alloy,

i've now stripped one side of the engine bay of all things that can be plated or painted,
needs a serious clean now!

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and another box of bits off to plating

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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Fri Oct 19, 2012 8:36 pm 

Joined: Thu Aug 13, 2009 7:27 am
Posts: 350
Location: salt lake city
nuts. my trans def doesnt have that.
oh well..

great build btw

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viewtopic.php?f=17&t=22188


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Wed Oct 31, 2012 6:03 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
nothing major has happened by i thought i'd put up an update anyway.
i'm waiting on a number of bits to come back from painting before i can continue.
box of bits back from plating

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cleaned up and installed

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The pic's don't look very good but i've tried to clean up the rubber components the best i could
but i was getting no where, so the last thing i tried worked, made them come up like new(ish)

before
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after
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next was to open the gearbox and find out what the gold dust was in the oil,
here's what happened

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the rear driveshaft support bearing got chewed out by the yoke!

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so the plan now is to put that one in the spare's department and use a much better
one, this is why i have many parts, you never know when you will need them!


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Mon Dec 03, 2012 12:24 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
i've been waiting on parts, painting and plating to come back so i can continue and try to get this back together by the end of the year, and i think i will get about 90% done with the rest over the holiday break.

The spare gearbox wasn't as good as i had thought it to be, so i pulled apart the original and it turned out to be not so bad after all, a few new bearings and swapped the rear support bearing, new seals and it's all done.

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and some bits for plating

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i don't know what this thing does but i couldn't leave it like that

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and i had a go at restoring some other stuff

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these are the original oil cooler hose

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thats all for now, still waiting on one engine mount and then it will all go together,
in the mean time i have started on this

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thanks for looking, should have some complete pics soon


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Mon Dec 03, 2012 6:21 pm 

Joined: Mon Aug 15, 2011 4:47 pm
Posts: 58
Location: norcal
great build , love 12a turbos.


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 Post subject: 1984 RX7 12a turbo GT
PostPosted: Sun Dec 09, 2012 12:13 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
i've got a few more things done in the past week or so, i thought the throttle body could be a bit tricky but it turn out not to bad, looks harder than it is (to me anyway)

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next up is for the new engine to meet it's resting place, sitting on new engine mounts as well, the mounts are not the same, the left hand is about 10mm taller than the other and if you have one you will find that it is stuffed and hitting the safety bump stop

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that's it for now, just changing the fuel filter before i forget and then i'm off to have knee surgery, so not much is going to happen in the next few weeks.
Thanks for looking, if you want pics of anything else just post a reply


Last edited by rx4rx7 on Wed Feb 20, 2013 1:16 pm, edited 1 time in total.

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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Sun Dec 09, 2012 8:24 pm 

Joined: Mon Feb 15, 2010 5:50 am
Posts: 103
Location: Williston SC
Looking good


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 Post subject: 1984 RX7 12a turbo GT
PostPosted: Wed Dec 19, 2012 10:26 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
thanks for that,
just putting everything back together, changed the fuel filter which is at least 5 years old and was very black inside,
should be ready to start very soon, just need to finish off a few things.

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yes there is an engine under there somewhere!


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Wed Dec 26, 2012 2:38 pm 
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Joined: Tue Aug 02, 2011 7:30 am
Posts: 45
Location: Colorado Springs, CO
That is very impressive. I never realized how close the motor is to the 84-85 GSL-SE.

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1984 Mazda RX-7 GSL-SE, 1964 Ford Galaxie 500XL 390 Auto A/C, 1970 Ford F250 Explorer 390 Auto Long Bed
My Car Blog: http://chrischillino.com/


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Thu Dec 27, 2012 5:49 pm 
Mild Cam
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Joined: Wed Feb 10, 2010 2:31 pm
Posts: 1677
Location: Cleveland, Ohio
Nothing I love more than a super clean engine bay. 8) Nice work so far!

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1980 Datsun 510
1980 Toyota Celica
1984 Porsche 911
1988 Mazda RX7
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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Sun Dec 30, 2012 2:47 pm 

Joined: Tue Sep 27, 2011 4:15 am
Posts: 319
Location: Adelaide
So neat!! Love it.

Can I ask what you did to refresh the plenum to get it so orange and no chips in the wrinkle paint.. I have a couple for my car and want it looking like new if I can?
Cheers in advance


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 Post subject: 1984 RX7 12a turbo GT
PostPosted: Sun Dec 30, 2012 7:14 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
Thanks for the good comments guy's.
beans: this is the original one from this engine and it has some paint missing that you can't see in the pics, all i've done is cleaned it with some household cleaner and hoped for the best, i'm working on getting some wrinkle paint made up but it is becoming very hard to do.

As it stands now the engine bay is complete, everything is done but it won't start!
i have gone over everything three times and cannot find the problem, it has spark and a fresh battery, the dizzy is working, there's fuel in the tank but it is getting to much fuel (flooding) i've changed the fuel pressure regs and the injectors are reco'd but i still don't know!
can anyone help?


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Tue Jan 01, 2013 4:31 am 
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Joined: Mon Feb 01, 2010 4:16 am
Posts: 86
Location: Geelong, Australia
can't help. just wanted to say how amazing this is and i'm stoked to see you going for total OEM purity. It's a thing of beauty (and probably greater expense than modifying!)

with all that plating you had done you may as well have bought yourself a plating kit. I have a Caswell electro-plating kit in the shed that i'm yet to set up, i bought it to do black passivate Zinc-plating on bolts for 2/3-piece wheels that need extra protection. it'll be handy to have for all facets of restoration though i think.

I can relate on the whole "why the f*ck isn't it starting?!" thing, i've been there many times and it usually comes down to something simple and just requires perseverance.

keep it up and thanks for sharing!

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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Wed Jan 02, 2013 3:38 am 

Joined: Wed Mar 11, 2009 6:09 pm
Posts: 589
Location: Australia
Not sure if this helps you but I had the seat belt metal covers power coated in a wrinkle finish to match the original plastic coating (which was removed). I can't see why you couldn't do the same on the plenum. Take a look at my seat belt update. You'd get it pretty close to original looking.


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 Post subject: Re: 1984 RX7 12a turbo GT
PostPosted: Wed Jan 02, 2013 9:02 am 
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Joined: Tue Aug 02, 2011 7:30 am
Posts: 45
Location: Colorado Springs, CO
rx4rx7 wrote:
As it stands now the engine bay is complete, everything is done but it won't start!
i have gone over everything three times and cannot find the problem, it has spark and a fresh battery, the dizzy is working, there's fuel in the tank but it is getting to much fuel (flooding) i've changed the fuel pressure regs and the injectors are reco'd but i still don't know!
can anyone help?


It sounds like either the reco injectors are sticking open or the computer is telling them to stay open.

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1984 Mazda RX-7 GSL-SE, 1964 Ford Galaxie 500XL 390 Auto A/C, 1970 Ford F250 Explorer 390 Auto Long Bed
My Car Blog: http://chrischillino.com/


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 Post subject: 1984 RX7 12a turbo GT
PostPosted: Wed Jan 02, 2013 3:24 pm 

Joined: Tue Jan 18, 2011 11:47 am
Posts: 67
Location: Auckland, New Zealand
Thanks guy's for the help,

gypsy: i have never thought of powder coating, i will check it out tho

rx-7 chris: i am hoping that it isn't the injectors, to remove them i need to remove the whole engine because they are trapped by the inlet manifold which is trapped by the turbo which is trapped by the steering box, so it can't be worked on in the car, but thanks for your help, is there anything else you can think of?


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