i just got my engine rebulid so i went to go see it to see how the process is going it turns out the guy didnt really street port it he just ported the exhaust ports and it wasnt that big of a difference and he already put the engine in...,would i have to rebuild the motor again if i want to REALLY streetport it(i aint planning on doing it myself)...

 

ill soon have pictures of my baby

 

Yeah, you would have to do another teardown on it in order to port.

 

do it while it's already apart. Just practice!!!

 

man that sucks i guess ill just stay with this motor for now and later on tear it down and port it...thanks guys

 

A 12A will actually pickup quite a bit from porting the exhaust. The stock exhaust ports are tiny. Comparing the intake ports of a 12A to a 13B shows little real difference, yet the exhaust is a totally different story. 12A exhaust ports compared to 13B, resemble a dime sitting beside a quarter...........

 

oh well thats good to know cause thats what he did, port the exaust...thanks that makes me happy ...i cant wait!!

 

He's probably just used to working with second gens, which, for the most part, have six ports. It's not considered safe to port the intake ports on a 6 port, so they DONT. Therefor, if you take your 12A to a 'specialist' who only has experience with FC/FDs, then you wont get a REAL port job.

 

I'm using my knowledge off of all the motors I've seen in Australia

Our 12A tallports as we call them(they are from the factory), have very large ports from the factory compared to TII 13b turbos. I've seen quite a few pulled down, and the 12A ports from the factory are hudge compared to 13bt intake ports.

I didn't really get any good looks at exhaust ports.

See some pics of my motor before and after extend porting(street porting) has been done to the intake and exhausts.

I don't have a pic of 13bt turbo exhaust or intake but i can tell you the intake is puny compared to the ones i'm showing you

 

Heres my housing post porting

Heres one of my two new housings



And heres my seals



I built this motor btw

 

Nice port job! I like the shape and size of those ports. I also just finished porting out my exhaust and intake. No templates used. I think porting from the back side of the the exhaust port and using the port sleeve as your guide is the best way to go about it. I may be wrong but the exhaust note is sweet and the overall increase in performance is just fantastic!* I also went large on the secondary ports and mild but wide (fat) on the primary ports. I'll post some pics if I get a chance.

 

i've never heard that?
im really interested in this in this six port subject because im planning on doing a port job on one myself,with templates of course and i just wanted to know how "unsafe" it is to port the intake port?

is there less room for mistakes than a four port?

 

Well, go to www.mazdatrix.com, they have a writeup about it (They refuse to port the intake on a 6 port)

 

Thats not correct. They will do the Intake
http://www.mazdatrix.com/s.htm

You are thinking of the 6-Port Exhaust.

" The 86-92 non-turbo rotor housings have a "splitter" (also called a "diffuser") in the middle of the exhaust port. These are part of the casting of the sleeve insert, and are VERY hard metal. We do not do any porting on these rotor housings! If we are assembling a "ported" 86-92 6-port engine, we use the Turbo rotor housings, which do not have the sleeve."

http://www.mazdatrix.com/faq/6pexh.htm

 

Sorry, my bad. It's EXHAUST they don't recommend porting on the six ports.

 

There is absolutely no issue with porting 6-port engines. He is probably confused by the (mistaken, IMO) statements by some that there is little or no performance potential by porting a 6-port engine. It pains me to say that Jim Mederer, of Racing Beat, is one of those people...I respect him but somehow I suspect his opinion is based on insufficient experimentation with this particular motor. We have seen great results.

The only aspect of porting you can't do to a 6-port is retard the secondary closing timing, since the auxiliary ports already close so late. You can still advance the opening timing of both primary and secondary ports and retard the closing of the primary ports. These primary ports are so small that any change is significant.

I have personally ported several 6-port engines, always with positive results. My first was on my GRM Challenge race car in 2001. Even running out of fuel at mid-track, I did a 14.7 quarter mile. This was with the stock exhaust manifold, a cat replacement pipe, the stock cat-back and the stock intake. One of our 2nd gen customers came in recently and showed us his dyno results. This was a Series 5 NA with a streetport, oil mods and our 6-port inserts. Full exhaust, E-fan, RB main pulley, etc. 189.9 HP (@6500) at the wheels, with 158.2 ft lbs torque (@6000) with an almost completely flat powerband! I think that's a bit more than even we anticipated, but it shows you that there is definitely potential.

 

Nobody does, since the turbo housings are a perfect, painless swap.

 

good stuff

 

So, percent, what do you figure the gain is on a ported 6 port?
I'm taking a few different first gens in to the dyno this weekend, so I'll have scans up of these (all 12A)

82 GS
full RB
Yaw
Carter FP
FPR
VERY mild streetport (so mild it might as well not be there)
DLIFDIS

83 GSL
aggressive SP
RB full SP exhaust
Yaw
Carter
FPR

Jay's black FB
Stockport
Presilencer-post exhaust
Yaw
Carter
FPR

I think it'll be a great comparison between all three (I'm gonna run my 82 first, and while the 83's running, I'll slap the headers on the black car, that way we can see the difference that porting gives)

 

you should totally keep us updated on the outcome of this.
im really interested in the results

 

mazdatrix says the housing is junk if you go into the water jacket. this is total crap! you can weld or epoxy it back and get the port timing you want with no adverse reliability consequences.

 

True!

 

and speaking of which...you should see what i'm doing to my renesis irons

 

Blake/GUITARJUNKIE : Do either of you guys have a good recommendation on a template for a 6 port (GSL-SE)? I am going to be opening it up to replace some seals and springs and would like to port it if I have the time/tools. I always figured there should be some good gains with porting a 6 port (maybe not as much of a gain as 4 ports, though). You always read about porting them not being worth it, difficult, etc., so that is what has discouraged me from doing it in the past.

Kent

 

Bridgeport intake *and* exhaust? Peripheral intake, side exhaust? Just guesses, but it's only a matter of time before someone does one or the other for the sake of being first. Seriously, whatever you do, keep us posted. We've worked on a couple of them, but because 99.99% are in warrantee, it will be a few years before the aftermarket gets a sufficient volume of them to do some serious experimentation...and even longer before conclusions are drawn from the results.