Project84

All TIIs are 4 ports. Anyone use the end plates with the auxilary ports from a 13B N/A? Did you use the stock N/A actuators or did you find another way to open the ports?

Just brainstorming here and I wanted to see what you guys think.

Rotorific

iTrader: (1)

There are plenty of people that have force inducted? a 6 port. A 4 port motor flows better than a 6 port motor therefore there is no need to use the 5th and 6th ports on a original 4 port motor. -Gabe

Aaron Cake

iTrader: (1)

Nope, sorry. Can't be done.

Jimmy325i

If a 4 port flows so much better then why does it take a HT-18 to give you guys 30 more hp stock and a lower redline?

Line up my n/a against your 4 port without the boost and I'll smoke the **** out of you. (and I run low compression rotors/ all motor)

It can be done, because it has been done many many times. All the n/a guys who go turbo are basically doing the same thing. I essentially have the block you want. I used a S5 TII intermediate housing in my S4 and it seems as though I ended up with so much power no one believes me except all the little ********* around here who refuse to race me, and my friends who've seen how fast my car is.

They make an adaptor piece that spaces out the turbo exhaust manifold from the block to clear the 6 port actuators and lower intake manifold. Another option I would want if I was doing the conversion would be a turbo header so you have the primary runners collect into the turbo flange. You'd be able to put the turbo at whatever angle you wanted and what not. It would also flow better.

Just my $.02

Aaron Cake

iTrader: (1)

The 4 port block flows much better then the 6 port. Larger port area if I recall.

To the original poster, try searching for "turbo install", or look at the archives. Lots of info.

importboi22

i know the 6port flows so good thats why all the professional NA RE draggers go 4 port blocks rite?

BlackRx7

just think 4 big holes sucking the air in as fast as it can go, then the 5th an 6th ports open up reducing flow through the 4 ports and routing them to 5th and 6th ports, I think the fact is a 6 port will flow more but slower, ie slower reving, a 4 port has less area for the air to travel through but it the air flows faster, faster reving ie more power.........

Project84

You have a good point. I plan on running a Camden Supercharger, so there will be forced induction as soon as I hit the gas. With positive manifold pressure, do you guys think that the larger 6 port config would really have a significant impact on the velocity of the a/f miture traveling to the rotor? I have a 87 TII and I think I want to take the end plates from the 87 N/A that I have and make a TII with 6 ports.

White_FC

I allways thought that the 6 port motors flowed more than the 4 port motors. We are talking stock motors here...
but the 4 port motors had more porting 'potential' than the 6 port's. ie. there was a larger area that you could grind away to make a bigger port.

Project84

The aux ports let in more air, and the fuel injectors would compensate for it. I'm going to try it though. I can't see the 6 ports hurting anything, I mean I'm going to be using a supercharger. Those 2 ports aren't going to affect much, but White FC is right, Mazdatrix doesn't recommend porting a 6 port because what there is to gain isn't really worth the effort. And that is what porting does. It lets the rotor open the port sooner, or close it later, which allows more air/fuel into the rotor chamber. That is what I want. More air and fuel.

capsoval

That is not true about porting a six port. Mazdatrixs only pumblished that because there was so much confusion about it. If you go to there web site now and go to FAQ there is a large post on porting a six port, and they have templates out for it as well. It was mostly a point of how much was too much on a six port porting job and they didn't want to keep telling everyone a 30 min. story on the phone. Check it out. Its really a good artical.

Jimmy325i

My end plate porting makes theirs look tame. i go all the way to the very edge of the upper port and smooth the runners out as if they're the only ones. then go up to the top ports and smooth the openings and open them up just a bit but spend lots of time working the transitions as the air enters the chamber. the two work together and sepparately all in one design. It flows like a big 4 port down low and like a small PP up top. (because thats where the advantages come from... the intake durration)

I wouldn't recommend (or even build anyone) an engine with the stock 6 port intermediate housing if you can get one of the bigger ported castings to work. I love my TII intermediate housing.

Project84

I posted this in another forum. The consensus(sp?) was that under forced induction, (I plan to run a supercharger) the larger the port allowing fuel/air to the rotor, the more fuel/air that will get to the rotor and you know what more air/fuel means Plus I got some input from people who actually did this.

And I read mazdatrix write up on porting a 6 port. They don't recommend opening up a 6 port motor just to port it.

White_FC

Does anyone here have pics of the actual STOCK ports of both a S4 turbo and a S4 6port? I would be very interested to see the differences..

from comparing the two lower intake manifold gaskets the 6port seems to have more area there.. just wondering if anyone has any shots of the inside of the motor?

vaughnc

Buidling ontop of the NA setup with a supercharger is VERY APPEALING to me. I'd really prefer to just "add" to the existing setup if possible, but....

.... creating a hybrid motor may be the only way to get both effiencient use of boost, and the "connected" NA feel as well. That would be a TII motor with S5 NA high compression rotors.

If I have the TII drivetrain, haltech, etc.. then I might experiment and just bolt on the TII flywheel to the NA motor and temporarily pipe up the Atkins supercharger.

I prefer to NOT make all my low end power through boost. If you can setup the supercharger & fuel delivery to come on at 90% of throttle between 1500-3000 rpms that would be perfect. I don't like how the TII lacks too much power out of boost at lower RPMS, so I'd like to cure that is possible.

The best setup of course is a 3 rotor NA motor, but I'd like to attemp to gain the same feeling with a supercharged setup.

Who knows, I need to research this a bit more.

Project84

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

http://www.mazdatrix.com/faq/port6p.htm

Those pages have pics from mazdatrix.com showing the ports of a 4 port and 6 port motor.

White_FC

Thanks for that mate, lots of good info there.