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Naturally Aspirated Performance ForumDiscussion of naturally-aspirated rotary performance. No Power Adders, only pure rotary power!
From the "12A" to the "RENESIS" and beyond.
Supplies are probably getting low.
The dealer with the best price I found online (Werner Mazda in NH) said they were unavailable. As soon as a couple weeks ago the "add to cart" button for the housings was active. Their website has a 10% off code that I hoped would work.
The next best one I bookmarked (*** Mazda in FL) said they will come from Japan in about 8-12 weeks. I jumped on that.
I might be mistaken but I'm not sure the GSL-SE or an equivalent 13B before 1986 was sold in Europe unless they got the 3rd gen Cosmo. Not saying they won't be able to order the housings, but they're going to be harder to find.
I believe you are right - the 13B did not come in RX-7s in anywhere but North America until the FC. The home market got the 12A Turbo, which was kind of the basis for the GSL-SE engine in a way.
What is interesting (to me) is that the GSL-SE is the Group B homologation for the RX-7. That is how they were able to get a 13B in that chassis for rally. So every GSL-SE you see is technically a homologation special. (I believe this also means that they were never available with a rear seat, since Group B was for two seat cars)
I should probably order a few sets. Mazda Motorsport still lists GSL-SE rotor housings, at least they did the last time I checked.
edit: Mazda Motorsport does not list GSL-SE rotor housings, but they do list the functionally equivalent N307 rotor housings which are from the "Super Injection" engine used in Cosmo/Luce. Funnily enough the cheapest rotor housings they have are N390s from the 13B-RE (JC Cosmo twin turbo 13B)
I believe you are right - the 13B did not come in RX-7s in anywhere but North America until the FC. The home market got the 12A Turbo, which was kind of the basis for the GSL-SE engine in a way.
What is interesting (to me) is that the GSL-SE is the Group B homologation for the RX-7. That is how they were able to get a 13B in that chassis for rally. So every GSL-SE you see is technically a homologation special. (I believe this also means that they were never available with a rear seat, since Group B was for two seat cars)
I should probably order a few sets. Mazda Motorsport still lists GSL-SE rotor housings, at least they did the last time I checked.
edit: Mazda Motorsport does not list GSL-SE rotor housings, but they do list the functionally equivalent N307 rotor housings which are from the "Super Injection" engine used in Cosmo/Luce. Funnily enough the cheapest rotor housings they have are N390s from the 13B-RE (JC Cosmo twin turbo 13B)
the GSL-SE housings are one of the part numbers i check availability on, and Mazda USA sells about 20 a month, they don't have them in stock all the time, they tend to get a shipment, and sell out before the next one arrives.
and if you think about it, Mazda has a whole rotary engine factory that is of no other use than making parts for rotary engines. if/when they retool it, we probably will have all the good stuff go NLA, but for now, they seem to be in the mood to sell the stuff that they make.
the GSL-SE housings are one of the part numbers i check availability on, and Mazda USA sells about 20 a month, they don't have them in stock all the time, they tend to get a shipment, and sell out before the next one arrives.
and if you think about it, Mazda has a whole rotary engine factory that is of no other use than making parts for rotary engines. if/when they retool it, we probably will have all the good stuff go NLA, but for now, they seem to be in the mood to sell the stuff that they make.
I thought they scrapped all the peripheral exhaust tooling when they started to make the relatively high production level RX-8. Good to know.
Now I *really* want to buy GSL-SE rotor housings, so that Mazda has an excuse to keep making them.
I thought they scrapped all the peripheral exhaust tooling when they started to make the relatively high production level RX-8. Good to know.
i think they actually tooled up to make the REW motors, a couple years ago they were showing up looking like they had been in storage for a while, but now they show up and they are fresh! i have not seen a current GSL-SE housing, but i wonder if the exterior casting changed to be more like the REW or Rx8
and actually for that matter there are still 12A rotor housings available, its not a US part number, so Mazda USA has no clue it exists, so its NLA here.
next thing they need to tool up is some sheet metal...
Figure I'll toss in my two cents. For oil cooling on my REW swapped 95 I used a pair of FD oil coolers. One mounted in both front quarter panels in front of the tires with the plastics removed from the wheel wells. They are slightly angled for fitment and the future addition of ducting (rather than venting brake calipers, I'll be venting to the coolers). Street car for me so I won't need the caliper vents.
I bought 2 new gelse housings few weeks ago. For a 4 port 13b I built for a buddy. $580 each. I got some used ones years ago from Atkins. They said they were from the old star Mazda series. Sealed race motors with one season on them. They had no water passage for the intake manifold because they were jdm spec. The ones I just bought didn't have the water passage either. Does the gslse stock manifold use the water passages? I never had a 6port 13b
I bought 2 new gelse housings few weeks ago. For a 4 port 13b I built for a buddy. $580 each. I got some used ones years ago from Atkins. They said they were from the old star Mazda series. Sealed race motors with one season on them. They had no water passage for the intake manifold because they were jdm spec. The ones I just bought didn't have the water passage either. Does the gslse stock manifold use the water passages? I never had a 6port 13b
gsl-se does not have the water passages. there is a Japan spec part number, but its a very similar housing
i think they actually tooled up to make the REW motors, a couple years ago they were showing up looking like they had been in storage for a while, but now they show up and they are fresh! i have not seen a current GSL-SE housing, but i wonder if the exterior casting changed to be more like the REW or Rx8
and actually for that matter there are still 12A rotor housings available, its not a US part number, so Mazda USA has no clue it exists, so its NLA here.
next thing they need to tool up is some sheet metal...
I've just received the new GSL-SE housings (took 3 weeks) and they still have the "License NSU Wankel" cast on top, so I think these are new old stock.
Care to share the JDM 12A part number or will it compromise your informant?
I've just received the new GSL-SE housings (took 3 weeks) and they still have the "License NSU Wankel" cast on top, so I think these are new old stock.
Care to share the JDM 12A part number or will it compromise your informant?
N236-10-100D, i just looked it up in the parts catalog, no magic...
it is not on the US price file, so all of the vendors that use Mazda USA will not show it as a valid number
Watching this thread very closely as I am collecting the bits to do a similar thing.
I have a 1990 NA. RHD.
13B PP. Possibly Dry sumped. ($$$$$ vs practicality vs need vs want)
Modded NB 5 speed.
I am using a V8 Roadsters front cross member i purchased with no mounts. I may change this to their LS kit for fitting ease as I have used a 12A 6 Port centre plate meaning have the ability to side mount the engine if easier.
Using twin RX8 oil coolers. Have not sorted radiator yet. Will be aiming for a "V" mounted system I think.
The exhaust has always been the issue with the planing. (RHD making it worse) so the info here has been very helpful.
@RXFURY I'm glad it helped, even if only a little.
Unfortunately the project hasn't seen much noteworthy progress recently. I will keep this updated when the time comes
Patience and dedication is key. It's taken me 3 years to get back to my swapped Miata. Even when I wasn't working on it I enjoyed helping others with tips and general advise in the Rotary Miata FB group. Here's to keeping the pilot light going when your not cooking away.
Patience and dedication is key. It's taken me 3 years to get back to my swapped Miata. Even when I wasn't working on it I enjoyed helping others with tips and general advise in the Rotary Miata FB group. Here's to keeping the pilot light going when your not cooking away.
Very encouraging, thank you so much. I'm going through some hard times right now. I hope it will see the light
Time flies. Thought I should probably give an update.
Over the years I was busy enjoying life by mainly building and driving my 'main' mx-5, for which I ended up going through tons of modifications as well as a couple of engine builds.
However the rotary swap shell/project has still been ongoing in the background every now and then.
I ended up completely restoring the chassis by welding new sills and wheel arches, tons of body work, fabricating my own rollcage (and tube bender!) from scratch, building a hood vent, fitting fibreglass doors/panels, among other countless things.
Remember kids, don't do everything at once or you might see over five years pass without the car even being painted.
Over the years I was busy enjoying life by mainly building and driving my 'main' mx-5, for which I ended up going through tons of modifications as well as a couple of engine builds.
06-02-19, 06:34 AM
