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My 13B NA Build Thread
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Hi everyone,
I'm Dan, from Argentina. Down here RX-7's are very rare cars... and people who know how to work on them are even stranger to come by -- so me and a friend decided to work and rebuild my car. This is my piece of shit FC, I love it. Attachment 716344 Attachment 716345 Attachment 716346 I decided to go the NA route. Attachment 716347 The car itself is a '91 FC... but not your average FC... it's a "Middle East/NZ" spec... or something weird like that. It has a S5 body, S4 engine with S5 size/shape intake ports, Distributor, Thermal Reactor exhaust, ABS + 4pot brakes, rear seats, open diff, and a unique 6-PI actuation system. Check the bay out Attachment 716348 So, the plans for this first stage are the following:
So it starts... Attachment 716349 Attachment 716350 Attachment 716351 Attachment 716352 |
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Attachment 716353
Attachment 716354 Attachment 716355 Attachment 716356 Old 3-piece Apex Seals Attachment 716357 Attachment 716358 Attachment 716359 Attachment 716360 Intake porting~ Attachment 716361 Attachment 716362 |
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Attachment 716363
Until I get a proper header (I plan to build a custom one), I got ahold of a US spec S4 exhaust manifold to replace the hideous and incredibly heavy Thermal Reactor. Check them out. Attachment 716364 Attachment 716365 Attachment 716366 Now blocking off several thingies... Attachment 716367 Attachment 716368 ... and doing some Throttle Body mods Attachment 716369 Attachment 716370 Got the plates lapped, they look really nice! Attachment 716371 And decided to send the exhaust inserts to hell! :egrin: Attachment 716372 |
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Removing even more stuff out of the car...
Attachment 716374 Several cleaned/to clean parts... Attachment 716375 Ported housings, check the size of those exhaust ports! Attachment 716376 Attachment 716377 Attachment 716378 A close-up of my engine's super VTEC. Instead of the rotating sleeves operated by exhaust backpressure, this LIM has these nice valves. The aux ports themselves (inside the front and rear plate) have a nice curvature as well! Attachment 716379 The ducts for the rear rotor were full of carbon deposits... all thanks to some EGR thing. Attachment 716380 Nice dual-sheave alternator pulley Attachment 716381 Another pic of the S4 exhaust mani... there's some beveling work to be done there, since the exhaust ports are massive now... Attachment 716382 Porting the TB a bit... Attachment 716383 The "stuff we don't need anymore" corner... there's over 100kg in parts in there Attachment 716384 |
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Getting ready for the rebuild
Attachment 716385 Setting up a notebook to record the whole process Attachment 716386 Attachment 716387 Attachment 716388 Build time! Attachment 716389 Attachment 716390 Attachment 716391 Attachment 716392 Attachment 716393 Attachment 716394 |
Cool Man!
That's a very weird engine setup that came stock! |
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With the basic engine assembled, time to celebrate with asado and beer!
Attachment 716395 Work continues... Attachment 716396 Attachment 716397 Attachment 716398 Now with the oil pan Attachment 716399 Beautiful Attachment 716400 Getting the engine in... Attachment 716401 Attachment 716402 Sending part of the exhaust to hell Attachment 716403 Getting more stuff in Attachment 716404 |
Wow that thermal reactor thing is a trip. Never seen one of those before.
Lookin good man. I may have missed it, but what are your plans for the exhaust? Just wondering why you didn't use headers, especially since the engine's ported. Noise constraints maybe? edit: Oops I just read the part where you said the stock mani was a temporary thing. My bad! |
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Such a cute little engine, hehe
Attachment 716405 ... my friend Luis battling against the wiring Attachment 716406 So that's as far as we've gone at the moment... we're waiting for some MSD Blaster 2 coils to arrive so we can work on the DLIDFIS setup and fire her up! I'll obviously keep posting stuff as we continue to work! :) |
Ive never seen housings like that. I wonder how those valves work? Nice work.
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Originally Posted by redlineracer
(Post 10513675)
Ive never seen housings like that. I wonder how those valves work? Nice work.
Attachment 716407 Attachment 716408 |
Nice job so far. Gotta love the Euro style FC LIM and the thermal reactor.
One thing I would recommend is to put the BAC back on. That's now the ECU regulates the idle speed. |
Wow, crazy stock setup. The butterfly valves on the lower intake manifold seem so rare.
+1 on keeping the BAC, you will hate yourself for removing it later. |
Thats a crazy l.i.m. Would be perfect for to start a 6pi turbo and still keep the 6pi working. I had a video from old top gear in early 86 showing the new FC and it was a s4 motor with a dizzy.
Just out of curiosity what is the ECU code? Maybe its my imagination but the center iron doesnt appear to be the same series as the front and rear irons. |
Originally Posted by jjcobm
(Post 10514234)
+1 on keeping the BAC, you will hate yourself for removing it later.
Originally Posted by SpikeDerailed
(Post 10514558)
Just out of curiosity what is the ECU code? Maybe its my imagination but the center iron doesnt appear to be the same series as the front and rear irons.
The center iron hasn't been swapped or anything weird -- it's what came with the car, stock. |
holy fuck I've never seen that gigantic thermal reactor before!! I thought the cast ones were big. good God!
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I must be magic, haven't had a bac in yrs and have never had idle issues after i set it.
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^If you want the stock 750-800 RPM idle, you need it. Otherwise, yes, just turn the idle (throttle stop) screw and go with a 1100-1200RPM idle.
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Originally Posted by Mushiki
(Post 10513627)
Until I get a proper header (I plan to build a custom one), I got ahold of a US spec S4 exhaust manifold to replace the hideous and incredibly heavy Thermal Reactor.
http://i26.photobucket.com/albums/c1...i/PC010216.jpg So odd that your car comes with a distributor. |
Originally Posted by jjcobm
(Post 10514782)
Why thermal reactor? Does this thing generate heat for your car or is it some sort of catalytic converter/exhaust manifold all in one thing?
So odd that your car comes with a distributor. reason is that rotory's combustion are relatively long and narrow. lots of unburn(partial burned) fuel = high HC and high carbon monoxide Thermal reactor is just a heavy duty chamber with fresh air injection so it allows the unburnt gas to "finish" burning. I seen one of those in person recently, it weights like maybe 100 lbs or some crap. Think of it, its pure steel. |
so u can buy template for porting your own engine, ive watched arron cake port before but if theres a template id feel much more confident doing ti my self, also does porting the intake throttle body help much and is it very difficult? and did i read wrong since you said you were using a s5 uim? and if you are what is required to do the installation
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putting down under 200hp for a non turbo I doubt porting the TB would be worth the trouble, but done correctly it can increase its max flow rate and reduce the resistance. there ought to be some comparisons documented using a flow bench.
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That thing is a unusual car...like a mix of all the left over parts from SA22(thermal reactor) through s5. I do however like that LIM, would be a nice way to have 6pi working with a turbo, just were to find one.
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Originally Posted by canonize-ryda
(Post 10514837)
... and did i read wrong since you said you were using a s5 uim? and if you are what is required to do the installation
Originally Posted by SpikeDerailed
(Post 10514952)
That thing is a unusual car...like a mix of all the left over parts from SA22(thermal reactor) through s5. I do however like that LIM, would be a nice way to have 6pi working with a turbo, just were to find one.
The brake master cylinder is out of a S5 T2, for example. It also has a 12v AFM instead of the usual 5v. Oh, and that unique N368 ECU no one knows anything about. Regarding the LIM, I might get rid of it in the future... I plan on running ITB's. |
itbs?
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