13b manifold flange
 

where to get intake manifold flanges? I been making them myself by hand, but i would much rather purchase one now. The time it takes to make it by hand just dosnt seem to be worth it...

Mazdatrix.com has them...here's the link..:icon_tup:

http://mazdatrix.com/e3.htm

For that much, I'll buy a chunk of plate and go at it. Plus, the only steel one they offer is for the 20B.

I actually started doing this in preparation for making a side-draft manifold for a 12A. I made the major holes with a drill and saw, then bolted it to a mockup block (just a collection of junk housings held together with two tension bolts) and used a die grinder to open up the holes to the proper size and shape.

I got about 2/3rds of the way done before I stopped playing with 12As...

It depends on how much you value your time. For exhaust, I'd just buy one of their flanges. (Oh wait, I did do that...)

what a waste.. they did the easy part and left the hard part for the customer. I meant a complete one. porting out the holes for the runners is what consumes most of my time.

I know it's a waste,but no ones putting a gun to your head:lol:

it's time consuming but i think you should stick making your own.that plate that mazdatrix is selling is a joke in two way's, the price $135 and the add itself...

"has NO ports cut into it - you make it into what you want":icon_tdow

lol... exactly. i guess im stuck making my own for now. actually, im starting machining school pretty soon. it will be much easier to make myself them pretty soon. i just thought there was someone out there making them like the exhaust flanges.

If you want, I can work with you to get them waterjet cut. You'll have to get a bunch of them, like 5-10, but that's not that big a deal.

All I need to do is CAD it.

Downside is that you can't have angled ports in the flange, I'm not sure if you want those or not.

I have some CAD files if anybody wants to have their own plates cut out (laser, water)

i just cut out all my own flanges myself in a cnc machine. paid like a bill total for about 10 flanges.

Send those CAD files my way

anybody has the CAD files for the 4 holed gasket on the 86-88 intake manifold (the one that seperates the top from the bottom)? I need to make a spacer to increase the length of the manifold.

yeah, send them over here too please!

If you could send the CAD files my way that would be great. I've been meaning to make up some aluminium flanges so that I can work on my ITB set up.

Whoever wants the file, send me an email address and remember that this a *.dwg file that I made using a digital caliper-during my free time.

have these been tested to fit or should we be printing them out on paper first and trying them for adjustment.

can you please send me the file?

Hey, I copied the flange from my 13bre(Cosmo) flange which has larger ports and also from a 13REW metal gasket. So you should print them out first 1:1 to make sure they suit your needs. Those are the only 2 pieces I had to work with. Anyone who wants send me a private message with their email address as I don't check out this thread too often.

Ok, is there anyone here that can host the file?

I wasn't able to open it with solidworks 2008.

I've finished my 6 port drawing and should have a bunch finished fairly soon, just need to finish designing a fixture.

Here's the file if anyone needs it. It's Autocad 2008 format

I have an aluminum 1/2" chunk that I had laser cut with 2 gaskets for sale if anybody wants it. I was going to use it as a spacer for my 2 piece Racing beat intake to lower my peak power range. This is an S4 style, which is what the 13b's use, but apparently the 12a uses the the GSL-SE style so all I did now was just take an old GSL-SE upper intake manifold and cut the flange on it to make it work. It's .455" as oppose to my .5" but I can survive with that.

I'll sell it for 90$ shipped OBO if anybody wants it. Here's the pics of it:

https://www.rx7club.com/attachment.p...5&d=1268462798

https://www.rx7club.com/attachment.p...6&d=1268462798

Looking for the equivalent ACAD file on the 13BREW UIM-LIM gasket layout sizing?

https://cimg3.ibsrv.net/gimg/www.rx7...d22dd9c286.png

I can obviously buy a gasket, but am mostly trying to determine the port diameter sizes in the REW UIM-LIM flange. A post on the forum stated that the two smaller REW primary runners are 30mm. The BRE layout above is showing 42mm for all four, but I’m unsure if the REW secondary runners are that same size?
.

just for future reference, the N3A1-13-112 gasket the Primary ports are 33.9mm and the Secondary ports are 41.9mm. so port size would be like 33 and 41?

i still find it a bit odd that Mazda used the big port engine in the low rpm automatic car and the smaller higher velocity runners in the sports car, you'd think it would have been the other way around, or at least i would

stumbled across this comparison:

https://rotarycarclub.com/rotary_for...hread.php?t=14

not so sure it actually works out the way you suggested in the quoted text, but hoping to post something more on it soon.
.

yeah, the Cosmo LOOKs a certain way, but since the port is angled its kind of an optical illusion
there are differences, the Cosmo gets the primary injectors out of the port flow.

https://cimg5.ibsrv.net/gimg/www.rx7...ae248ef318.jpg


https://cimg1.ibsrv.net/gimg/www.rx7...83a3b99193.jpg
https://cimg3.ibsrv.net/gimg/www.rx7...4ca0cff4f6.jpg