Frankenstein 13b4port
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Joined: Jul 2002
Posts: 875
From: DC
So I've been told that I can take my gslse engine and use 12a endplates and then I can have my cheap 13b 4port bridge. Question is what intake manifold will fit? I'm using a side draft weber. so could I use a t2 s4 or s5 lower intake manifold, or the 74-78 RB lower intake manifold. with my rb upper to weber.
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Joined: Feb 2002
Posts: 67
Nope; 1st gen 4ports and 2nd gen 4ports have different flanges. All I know of is this...
2nd from the bottom; http://www.mazdatrix.com/r-idamanifolds.htm
2nd from the bottom; http://www.mazdatrix.com/r-idamanifolds.htm
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Senior Member
Joined: Jul 2002
Posts: 875
From: DC
http://www.mazdatrix.com/r-weber.htm
Since I'm using a side draft weber and I allready have part #18100, I think I could just get 18112 and it should work. hmm
EARLY 13B 4-Port Engines
(produced from 74-78, but can be "created" from parts combinations
Since I'm using a side draft weber and I allready have part #18100, I think I could just get 18112 and it should work. hmm
EARLY 13B 4-Port Engines
(produced from 74-78, but can be "created" from parts combinations
Member
Joined: Feb 2002
Posts: 67
actually; I don't think so. Look at the flange differences between the previous manifold I posted, and the TII 4port flange below; I don't believe it will bolt up without modification... and modifying a cast manifold flange doesn't seem like it would be too fun... pictures.
flange you have
later TII flange
See how the bolt holes for the front and rear irons are nowhere even close?
flange you have
later TII flange
See how the bolt holes for the front and rear irons are nowhere even close?
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Joined: Jun 2004
Posts: 524
Originally Posted by Hyper4mance2k' post='797773' date='Jan 30 2006, 12:15 AM
So I've been told that I can take my gslse engine and use 12a endplates and then I can have my cheap 13b 4port bridge. Question is what intake manifold will fit? I'm using a side draft weber. so could I use a t2 s4 or s5 lower intake manifold, or the 74-78 RB lower intake manifold. with my rb upper to weber.
You will use a manifold designed for the '74-78 13B. Rotor housings between 4 port 12A and 4 port 13B are directly interchangeable. What you're doing is no more Shelleyan than what Mazda itself did in the 70's when they made the 13B in the first place.
Another way to look at it is that the GSL-SE engine is just a standard 13B with 6 port 12A end housings on it.
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Joined: May 2002
Posts: 22,465
From: California
Originally Posted by heretic' post='797789' date='Jan 30 2006, 05:16 AM
You will use a manifold designed for the '74-78 13B. Rotor housings between 4 port 12A and 4 port 13B are directly interchangeable. What you're doing is no more Shelleyan than what Mazda itself did in the 70's when they made the 13B in the first place.
Another way to look at it is that the GSL-SE engine is just a standard 13B with 6 port 12A end housings on it.
yeah gsl-se motor is a parts bin special. the gsl-se engine (and if i remember right the 12a 6 port) had the 86-91 intake gasket bolt pattern. but that stuff is all on the end housings anyways. ramble ramble ramble
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Joined: Sep 2004
Posts: 35
From: Alaska
4 ports ar cool but your se motor will give you more power than you think.A huge street port may get you
180-200 hp range(with allot of tuning).A full bridge you can shoot for 250ish.bridge is harder to tune but it feels good to say you just beat them with your original motor,anyway,the se 6 port will accept a newer 6port intake but the center iron ports are smaller and need to be port matched.you will end up with a ramp at the bottom of the center iron's ports where they meet up with the intake.i have done this and it works well but is time consuming.kids crying gotta go
nick
180-200 hp range(with allot of tuning).A full bridge you can shoot for 250ish.bridge is harder to tune but it feels good to say you just beat them with your original motor,anyway,the se 6 port will accept a newer 6port intake but the center iron ports are smaller and need to be port matched.you will end up with a ramp at the bottom of the center iron's ports where they meet up with the intake.i have done this and it works well but is time consuming.kids crying gotta go
nick
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Joined: Jul 2002
Posts: 875
From: DC
Originally Posted by alaskarotorhead' post='799381' date='Feb 3 2006, 10:06 PM
4 ports ar cool but your se motor will give you more power than you think.A huge street port may get you
180-200 hp range(with allot of tuning).A full bridge you can shoot for 250ish.bridge is harder to tune but it feels good to say you just beat them with your original motor,anyway,the se 6 port will accept a newer 6port intake but the center iron ports are smaller and need to be port matched.you will end up with a ramp at the bottom of the center iron's ports where they meet up with the intake.i have done this and it works well but is time consuming.kids crying gotta go
nick
180-200 hp range(with allot of tuning).A full bridge you can shoot for 250ish.bridge is harder to tune but it feels good to say you just beat them with your original motor,anyway,the se 6 port will accept a newer 6port intake but the center iron ports are smaller and need to be port matched.you will end up with a ramp at the bottom of the center iron's ports where they meet up with the intake.i have done this and it works well but is time consuming.kids crying gotta go
nick
Well it's allready not the origional engine so I'm going all out. I want about 300 fwhp. Thats why i'm going to make it a 4 port half bridge.
