hey guys im porting out my 87 N/a just about done, just have to sand paper roll them now, i wanna see pix of all your port jobs so i have something to go by, i have the mazdatrix 6 port street port template

 

here is a s4 6 port comparison of rough porting before cleanup porting and surface lapping against a stock port. On the exhaust, it is not the best way to do it, but the damn sleeve kept eating my taps so I gave up and ported around it on these housings. sorry no better pics right now, these arent the prettiest ports since they werent finished in these shots but you get the idea.

 

i don't see many people go that large with the primary ports and time them that far, does it hinder your lower end power?

 

it is close to the size of a tii primary. As long as the actuators are in their and functional they pull great in the low end. I have since changed my style a little and leave the outer edge stock and just go up and out a bit at the top, no further down either, trying to minimize the overlap. A 6 port se motor in a 1st gen with those same ports kept nose to nose with a very mildly modded TII up till 3rd gear.

I did an se 13b for a friend, it has about the same size primaries, not much done to the secondaries, but the aux ports are freakin huge and to top it off have a little aux bridge on there too. With the modified sleeve, the aux port and bridge still get almost completely closed when the sleeve is in closed position. When my bud finally gets his *** together and gets his car ready for the motor to go in, I will post some results. But the way he is going that could take awhile. I will try and post some pics of the ports on it tommorow. the exhaust holes are massive, bigger than most turbos!!

 

i like that big a$$ port i took some pix of mine sorry, it was on my cell phone does mine look alright so far? the one where you can see me that is the stock port just to look at

 

i didnt do mine myself....i had Chris at Banzai racing do it for me.... here is the link:
http://banzairacing.net/winnie_02-05.htm

 

 

yes its junk iron.. wel it is now, I did it with a dremel when I was bored. Was kinda fun though.

 

88IntegraLS---- thats a nasty port holey ****!!!!! is that your engine? im not gunna have my 6 port **** in... do you? how does it run?

 

I thought i had gone a little far but i guess mine are relatively modest when compared to the previouse ones.

I used a mazdatrix template, then went a little furthur on the port, portmatched the template to the port and ported the oposite port.

 

Get those flowbench tested. then let us know

 

Who's ports? there's 4 different porting jobs here, as for mine, kinda late since the motor is in the car and running, still needs tuning and break in before i can boost.

 

i did not want to quote my own post but it says "88IntegraLS"
but what the hell this goes for everyone

 

Yes all that is running in my car right now. The 6 ports are still there with the working sleeves that come on at 4k rpm. With stock main cat and exhaust, only a racing beat header, the car runs upper mid 14's in the quarter mile with 96 trap speed, and idles at 750 almost like stock, and gets 25+ mpg on the highway. Above 2k rpm it has the stock level of torque and above 3k it starts getting pretty strong. It sounds totally pissed and doesn't stop pulling; the power band is very linear from 5k-8k rpm. The rotor housings are all scraped up from the rotary aviation seals so its compression isn't great, but It's definately fast for an NA. Stock ports suck!

 

so for i like 88IntegraLS' porting, very nice.

 

 

wow, yeah thats going to be a fun one

 

I did some more work today, i think it's just about good as done....well my center and rear irons. I left one alone to see the diff.... what do you think? And do you guys think I should go bigger on the center ports? i did a lil bit lower then the template said. (mazdatrix)

 

In progress 93 13b-rew 1/2 bridge into a 87' turbo II, The pics are of 1/2 bridg, the exhaust port vs S4 TII exhaust port.

 

Aaron, are you still using your 5/6 sleves with that porting job, or did you leave them out? How's it run in the low end?

 

The plan was to keep the 5th and 6th port system active with butterfly valves in the manifold, but I won't be doing that. So now I kind of wish I had extended the bridge lower. But I still may experiment with valving the ports...

The engine has not been run yet. With the high compression rotors, boost and bridgeport, low end is expected to be quite impressive. Of course, there's no reason that any bridgeported engine be lacking in low-end compared to a stock engine.

 

bump dat

 

I hate to ask this question in fear of getting flamed but I must what is porting and what does it do?

 

porting on a rotary engine is like boring on a piston engine (if you have any knowledge of that)

anyways...it allows for more fuel and air to go into the engine...producing more power...different types of ports allow for different types of applications...also...you need to port the exhaust to allow for the increased air and fuel burnoff to get out of the engine.

if you are REALLY curious about porting...go to www.nopistons.com...they have a whole section dedicated to it and you can really learn a lot.

and for pics of my ports on my 12a...click the sig...

 

Not true. Porting is more like changing the cam. Porting does nothing to increase the physical displacement of the engine like boring would.

Basically speaking, porting is the act of changing the intake and exhaust port shape. This is done to increase flow by changing port timings. Generally opening them sooner and closing them later. This increases port size, thus keeping them open longer then stock, thus flowing more air and fuel. Most ports are a compromise between radical timing (think big cam on a piston engine) and drivability.