I'm about to pluck my 1990 GXL's 13b out for a rebuild, and I'd like to do my own street-port job. Is there a how-to, or tutorial somewhere that will give me a general idea of what I'm doing?

Thanks!

 

Well, I've found a few semi-promising sites here, but I'm looking for something a little more indepth. Does anybody have an already street ported housing that I could see some pics of? I'll post the links that I've found below for public benefit:

http://www.mazdatrix.com/faq/porting.htm

http://www.geocities.com/MotorCity/P...8/porting.html

 

check out racing beat. they have templates for all kinds of ports. they have race and street sets i think. that would be a pretty good deal. im gonna do the same myself, i plan on yanking the motor this summer and doing the rebuild and port jobs myself. best of luck to you man, just dont hit that water jacket!!

www.racingbeat.com for your templates.

 

Now I hear that I shouldn't open up my exhaust ports. Is the norm for a street port just to do the intake ports? And couldn't I just take some of the images on those pages I found, and then make my own templates using my printer?

 

unfortunately, u cant use the pics from the site. its cheap anyways, like $20 or $30 for both of them. and yes, i would port the exaust. u dont extend the size of it on the outside, you just make it equal diameter inside the houseing. it goes like this: in the housing, its a small hole, and it progressively gets bigger until u get to the end of the exaust port, then u see where u bolt up your headers. u want to leave the hole were you bolt up headers the same, u just want it to be uniform in all the way. under stand? heres a little pick, it might help:

(rotor) =O (headers)

see, its small, then gets big. so u want it like this:

(rotor) OO (headers)

 

Well, one of the sites (I don't recall which at this point) shows before and after pics of the intake port. Now if I was handy with the GIMP (Photoshop's Rival) couldn't I take a snapshot of my intake port, then make their "Before" shot of the intake port, and make it bigger/smaller until it matched up with my intake port pic. Then measure out my own templates using my results? And I coult probably wing-it on the exhaust ports if I'm just making the inside of the port as big as the outside. This can't be too hard to do.

 

You really should get a template or make one yourself... You will want to keep the port shape the same for both rotors for the best result, so a template is needed.