On the Mazdatrix FAQ, it says you can't do any exhaust porting on the 6 port-N/A without changing the rotor housings and they supply no templates for bridgeporting a 6 port yet I see people talking about bridgeporting their N/As. Whats the secret?

 

The exhaust can be ported, but theres a diffuser in the way. You need to grind it out before you can port the n/a rotor housings. Or you can get TII rotor housings, which do not have the diffuser. Mazda put it there to keep the noise down on the n/a's.

On the 6 port intake ports, there is already too much timing there. Just grinding the 2 ports into one will give the same duration as a PP, but opens a little later. If you bridge that, you would have a motor with a power peak ABOVE 10.5K, which is where even the best 13B's start to tear themselves apart. 10.5K is the magical number where the rotors cause the ecc shaft to flex enough to let the rotor hit the side housing. This shatters the apex seals, and destroys the housings.

Any time you see a bridge ported n/a motor, its a bridge ported 4 port motor.

 

No need for bridge porting check this out:
Porting Template for these ports, and for the center port as shown lower on this page. The template allows two different ports to be on the same piece of metal. The ports are scribed onto the template - you need cut and grind them out to the scribe marks.
Part Number 49-2226P In the Mazdatrix Catalog.






I did that to mine plus removed the sleeve and eliminated the valves which turn the sleeves. Ported the exhaust (BIG TIME). Slapped a TII upper manifold, turbo and intercooler system and added gsl-se as secondary injectors.
So you see, you do not need a bridge!!!! LOL Have fun guys!!!!

 

So you're saying if I bridge those 2 ports together I would need a new stronger E-shaft? Also I thought PP ported engines peaked at 10k rpms?

 

interesting.

whats the pros and cons of blending these 2 ports compared to a genuine PP?

would the blended ports be better off than a brideport?

btw, mazdatrix used to port out the diffusers in the exhaust, they say that they are Very hard and takes quite some effort to eliminate and grind them away. i guess they have been hardened from the exhaust heat.

 

yeah, the diffuser is hard as hell. It's really a pain in the arssssss. but it can be remove, i did it. Also a read someplace that thto port the middle housing, is better a TII Housing, because has more material to work with.

 

angel guard... it looks like that that gsl se injectors.. on the secondary for the high end is a puerto rican trick because my neighboors have the same on the turbo II's jajajajaja
what plugs did u use?? because the factory ones dont plug in

 

this is a six port street port from judge ito

 

If I remember correctly in Mazdatrix site it says "siamesed" 6 port is just too much port. However, I think this is what owner Dave Lemon is trying to do for his E-prod. car. Rules must allow for modification of existing ports, but not adding bridge/p-port. Search for his post a while back, interesting info. Forced induction is one area I think this siamesed 6 port could be good in since it will allow for using steel apex seals instead of carbon, like p-port. Just crank up that boost to make up for the lower intake velocities that raise your power curve so high on an NA.

 

The problem with the siamesed 6 port isnt the port itself. Its the intake. The runners in the stock manifold are WAY too small to use a siamesed 6 ports. The Mazdatrix guy is messing with porting like that, but he has a custom intake manifold, and is spending lots and lots of time on their engine dyno configuring the intake runners. Last time I heard from him, it was making good power(dont remember exactly), but the powerband was never peaking. The hp was still climbing at his set rev limiter.

 

As well as stock fuel system, stock engine management, stock exhaust, stock clutch, etc. I was making the comparison to p-port and advantages of siamesed ports- rules of classes, apex seal wear/material and compatability w/ forced induction. Not comparing to a mild street port...

 

So what is the most power I can get out of a street ported N/A? The blending of the ports would be worse that a PP port on street right?

 

i like that port in Voskos picture. just a fine line between the normal port and the aux port.

does the port open up any earlier on that one? or was the port just opend up at the top, closer to the beginning of the Aux port? was the Aux port changed at all?

 

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