[relisys190]

According to mazdatrix porting a 6 port mazda rotary engine is almost useless. HOw can this be true?

I want to port my engine but of the power gains are minimal i am not going to. PLease help me out guys.

[relisys190]

And... Sorry i'm not post whoreing... but.

Port matching the intake system LIM... UIM.. TB/mod... how much gains are seen there?

[RotaryRocket219]

Ruffly 25% more power....if your looking for big power (ive gone to this realizatoin) forced induction will get you there alot easier.

[RotaryRocket219]

I just saw you have a rebuild..you going to tear it apart again to port it? Did you rebuild it yourself?

[Apex13B]

dont worry relisys, i cant get an answer at all on this subject

[dac]

A few people have tried it or done it.

I bought some sideplates that someone did. I haven't yet used them.

http://www.daczone.com/sideplate2.jpg

[pengaru]

you can port it, the main problem is the 6 port engine housings don't have alot of meat to them so theres not alot of porting ability, on the primary intake ports in particular. and the exhaust diffuser is in the way of porting the exhaust, which you can grind out but is a pain to deal with.

the end plates are fine, and offer a nice mix of low end torque capability and long duration for high end power, with working aux ports... but if you're building the motor it would be worthwhile to use a turbo intermediate housing which has larger ports stock, and more meat to port so you can make the primary ports quite a bit larger than your stock 6 port intermediate housing.... then either grind the exhaust diffusers then port the exhaust ports on your rotor housings , or pickup turbo rotor housings which have no diffuser and port those.

i think the shops just don't like explaining things and don't want to deal with people porting the 6 port intermediate housing and finding the water jacket, then complaining to them.


here is my street ported S5 turbo intermediate (primary) intake port:
http://pengaru.com/~swivel/cars/rx-7/10-29-2002/IMG_1920.JPG

I don't have a picture of the S4 NA stock port but you should be able to find one for comparison purposes..

[isamu]

Yea, listen to Pengaru he knows what he's talking about. I have a couple of pics of my n/a housing with a streetport. I had it done because my engine was toast and was going to be apart anyway. I don't think I would pull a decent running engine apart just to port it, unless you were doing it just for fun. I think it would be more cost effective to just spend the money on exhaust and an intake, which would yield good power increases. After all they will be key components in harnessing the extra power out of the port job when the time comes.

Attached File(s)

•  port1.jpg (64.4K)
  Number of downloads: 233

[isamu]

Here is another of the 5th and 6th ports

Attached File(s)

•  port.jpg (63.49K)
  Number of downloads: 200

[RotaryRocket219]

http://www.vosko.net/photos/porting/sixportstreetport/sixportstreetport-3.JPG

One of Ito's ports from Vosko's site.

[RotaryRocket219]

Beautiful..

[Geoffman72]

Ask Judge Ito! :D

[rotary>piston]

ito's gone for the next 4 months :cry: :cry:

This post has been edited by rotary>piston: 20 April 2003 - 02:26 AM

[RotaryRocket219]

I saw that thread..looking for a house I guess. :bow:

[knonfs]

dac, on Apr 18 2003, 09:35 PM, said:

A few people have tried it or done it.

I bought some sideplates that someone did. I haven't yet used them.

http://www.daczone.com/sideplate2.jpg

:ok:

Now I think its time for you to share where you got the template?!?

ITO?!?!?

I WANT ONE :D :)

[spinnin10gs]

I DRIVE A 83 GSL WITH A FULL BRIDGED 6 PORT, HOLLEY INTAKE, STRAIGHT EXHAUST TO A RACING BEAT MUFFLER, POSI REAR, ACT STAGE 4 SPRINGLESS CLUTCH, AND I'M GESTIMATEING AROUND 275-300 RWHP. BUT NEXT WEEK WHEN I GET PAID I'M BUYING 3RD GEN HOUSINGS FROM A FRIEND THAT ARE ALREADY BRIDGED. SO YOU CAN BUILD A SIX PORT AND MAKE IT FAST. IT'S JUST THAT YOU CAN BUILD A 4 PORT AND MAKE IT ALOT F-ING FASTER. SOMEONE TOLD ME THAT ATKINS ROTARY HAS A 10 SEC ALL MOTOR 6 PORT. IF ANYONE ELSE HAS HEARD THAT LET ME KNOW IF IT'S TRUE.

[spinnin10gs]

ANOTHER THING IS 4 PORTS HAVE ALOT MORE AREA TO PORT THAN A SIX PORT SO THE MORE AIR AND GAS YOU CAN FIT IN THE MOTOR THE FASTER IT WILL BE. "VOLUMETRIC EFFICIENCY".

[smitty]

can I get a link to vosko's site I want to get another look at judge ito's port job? I get no picture on rotor nut's post.
thanks
Dave

[pengaru]

I LOVE CAPS LOCK IT'S REALLY COOL THANKS

[Judge Ito]

I have been porting some 6 port engines lately. I've been trying to make some ports that would make some decent power. So far one seriously bridgeported 6 port engine that I made is making some very impressive power. The only down side is the rough idle. Some people love the brap,brap,brap, some people don't. I recently put together a wild street ported 6 port engine, but no dyno numbers yet. I'm currently building another wild ported 6 port 1990 engine and Ill try to post results on that engine. I have noticed that part of making power on a six port engine is tunning, in comparison to a 4 port engine. if people are tunning both these engines the same way, then they will not get good results out the 6 port engine.


update, I read on the other forum, that the series 5 Rx7 engine I ported aggresively(6 port) made 196rwhp using an apex fuel controller. Im sure most of the power was made in top end. I also read engine has been running since I put it together back in 2003!!!! hasn't been apart for 5 years!!! 2008 and still strong... hooray for reliability...

This post has been edited by Judge Ito: 13 December 2008 - 07:40 AM

[Racerx3sp]

Here in the Northwest,we don't usually port the sixport motors cause the stock induction does not flow enugh air to make any good hp,and then you can't pass deq either. on dave atkins 10 sec allmotor car? i haven't seen it.when i go to Seattle raceway,the only cars that i have seen are his 17 sec supercharged cosmo lol,and a 14 sec supercharged 1st gen. he was surprised to see that a P-Port in a streetcar would run a mid 12,all motor,full int,w/ full exh.they biuld some pretty bizzar stuff ,but it all seems to be slow for what it is.

[sleeper7]

Judge Ito
That is a interesting comment you made about tunning a 6 port vs a 4 port motor. I have been boosting a 86 n/a motor for the last 9 months with a T3 60-1 at 19-21 psi with good resutls I feel. 11.61et at 124.89mph with 1.89 60 foot. 400rwhp. car weighs 2720lbs. For the last month I have since changed my set up to a T4 T66 .96a/r p-trim, 86 turboII motor with large street ports and small bridge on the the secoundaries. 23psi. This set up seems slower and less responsive. Yes the higher rpm range is nice but the trottle response is not the same. My ET times seem to be the same but my mph is down a few.12.01et at 123mph with a 2.05 60 foot. No I did not clearance everything inside, did use the atkins two peice seals. Shifting at 7500rpm's. A/F ratio is a little richer, egt temps are 50-100f deg lower. Timing, air temp and water temp are the same. Any advise would be thankful. sorry to ask questions on some elses post.
chuck

[diabolical1]

Judge Ito, on May 11 2003, 06:23 AM, said:

I have been porting some 6 port engines lately. I've been trying to make some ports that would make some decent power. So far one seriously bridgeported 6 port engine that I made is making some very impressive power. The only down side is the rough idle. Some people love the brap,brap,brap, some people don't. I recently put together a wild street ported 6 port engine, but no dyno numbers yet. I'm currently building another wild ported 6 port 1990 engine and Ill try to post results on that engine.

2 years down the road ...

any results on those 6-port streetports?

[crpdragracing]

diabolical1, on Jun 19 2005, 08:02 PM, said:

2 years down the road ...

any results on those 6-port streetports?

WOW! The guy probably sold the car, who knows........interesting subjects have no end............something like....In the twilight zone!

[guitarjunkie28]

this is anything but useless...  beater_bridge1.jpg (76.36K)
Number of downloads: 215