I have a couple of questions-first, porting the exhaust ports in a GSL-SE's stock N/A rotor housing. Pineapple racing's website says:

"This exhaust porting template kit includes one aperture template and one aligning jig. The aperture template is version EP1A, which is recommended for 84-91 RX-7 Non-turbo 13B streetported engines using 87-91 TurboII Rotor Housings. We do not recommed the use of NA housings due to the exhaust baffle restricting flow. Other aperture templates are available for different engine/porting combinations."

They don't suggest porting the housings I plan on using, but I know it can be done. Should I buy the templates from them?

Secondly, who else makes porting templates for a 6-port that will work with the secondary and auxillary ports on my stock SE irons? I believe that I can use the ones from Pineapple racing for S4 & S5 engines (even though they say "providing you don't modify the aux. ports"), but I want to verify that before spending the money on them.

Who on here does great port work? I know I can do the intake as long as I get the right templates, but this exhaust baffle scares me. I don't want to start porting the exhaust ports and have a sleeve or baffle fall out into the engine or turbo manifold. Any recommendations or suggestions would be greatly appreciated!

BTW-I'm going for a large "street port" on the intake (sec. and aux. only-minor smoothing and gasket matching for the primary ports) and a torque-enhancing modification to the exhaust ports (not too big, but enough for good flow). I'm shooting for about 300 flywheel HP with around 12 or 13psi of boost, and the most torque I can squeeze from the engine (smaller turbo). I'm not going too radical with this engine, I want the ports to match my preferences. No "race port" exhaust for me. Thanks again for the help guys!

 

Check out the current thread in the 2nd gen forum about subject.

 

The GSL-SE rotor housings don't have the exhaust baffles so the porting will be fine, just the same as TII rotor housings. The baffles in the 86-91 NA housings are for noise reduction but you don't have them. There is probably a typo on the site.

Why not use 12A front and rear irons. there is a ton that you can port on them. In fact, once streetported they will have a VERY close port configuration to a TII. They are directly interchangeable with the SE housings. Just keep your SE center housing so that you can keep the port injectors.

You could also use TII intake manifolds with some minor porting and modifications to the bolt-holes. 300 horsepower would be much easier with this setup. You'll also have the secondary injectors which would be much better for boost.

 

look up judgeito (or judge ito) on this site and on www.nopistons.com he has done wonderful things with 6port porting.

 

Yeah i was talking to judgeito too, to bridgy my SE irons. never got a price though

 

regardless i wouldnt port a stock untouched gls-se housing for anyone or anything they are getting too rare and too hard to get a hold of get a nice 6 port s4 or s5 and go that route you can use all the SE stuff on it and it will work the same ive done it with my GSL-SE conversion that i had no choice on using an S4 for but i run all GSL-SE intake computer everything

 

Thanks for the info-that's what I was wanting to hear. I've decided against building a four port engine-that was my original plan-but I believe I can build one with a lot more useable torque in the lower RPM range with a boosted 6-port configuration.

I will eventually build a four-port monster with a massive turbo, but that'll come later on down the road. And as for modifying GSL-SE housings, I'll still have a good set by the time I build this engine that I'll trade you for a set of '87+ turboII housings...I plan on buying salvaged and re-cycled JHB Cermet coated housings to use in my project engine. Does anybody know if the cermet coating can be ported (around the exhaust ports)? Thanks again for your time, help, and cooperation...

 

Problem is that I don't have any S4 or S5 N/A housings/irons/etc. I have two complete SE engines, one will be installed and run for the present time in stock configuration (or close to stock with no emissions or EFI parts) and the other will receive the cermet coated housings and only major port work in the stock front and rear irons. I'll only smooth the primary ports in the intermediate housing, so I don't see a big deal in it. I thought housings and irons weren't interchangable between '78-'85 and '86+. Mazda moved a lot of **** (like oil control rings, and the location of the coolant o-rings) when the S4 was introduced and besides, I used the parts from a car that was headed for the scrapyard if nobody bought it. If I hadn't have bought that car then the parts would be even rarer...

 

I have two or three bridg-port NA 6port motors..

I could let one go or even sell a set of irons..
They ran 12.6 off the trailer on pump gas...79 rx7 @ 2400lbs