Welcome to the North American Subaru Impreza Owners Club Monday September 22, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-23-2004, 09:22 AM   #1
cjfike
Scooby Newbie
 
Member#: 60116
Join Date: Apr 2004
Location: (ab)Normal IL
Vehicle:
1999 RS Coupe
Silver Thorn

Question 2.2 Single exhaust port - enlargment

Single exhaust port heads for the 2.2, is there potential to enlarge the port?

Unfortunately, the summary of the threads usually is 'becareful, there isn't really a lot of room to remove metal in that area...'.

Or start up the 'let's swap heads theme music'.

I certainly understand caution and reservation, not loading up the grinder with the 3" metal removal attachment, and having 'at it'.

Points that I have been pondering:
  • EJ22 dual port and single port head castings are basically identical.
  • Other than metal, how would it be possible or logical for engineers (other than ego) to place internal workings into that space?

Has anyone enlarged the exhaust port on 2.2 heads to improve exhaust flow?

What was the outcome?

Or in other words: did you load up the grinder and have at it?
* Registered users of the site do not see these ads.
cjfike is offline   Reply With Quote
Old 08-23-2004, 05:00 PM   #2
FuJi K
Scooby Guru
 
Member#: 3687
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

Default Ttt

humm....sounds interesting.... Maybe I'll have at it as a next project for me.
FuJi K is offline   Reply With Quote
Old 08-23-2004, 06:11 PM   #3
Tim Sanderson
Scooby Guru
 
Member#: 6486
Join Date: May 2001
Chapter/Region: MWSOC
Location: S.E. wisconsin
Vehicle:
00 Impreza 2.5 RS
Blue Ridge Pearl

Default

I would try getting a spare head and use it as a sacrificial lamb.
Tim Sanderson is offline   Reply With Quote
Old 08-23-2004, 10:00 PM   #4
cjfike
Scooby Newbie
 
Member#: 60116
Join Date: Apr 2004
Location: (ab)Normal IL
Vehicle:
1999 RS Coupe
Silver Thorn

Default

First I need to see how the 2.2 heads compare to the 2.5 as flow is concerned. Everyone seems to use the 2.5 as the benchmark for flow, intake and or exhaust.

Then buy the 'lamb', and the 3" metal removal attachment. Does Binford make that?
cjfike is offline   Reply With Quote
Old 08-24-2004, 08:57 AM   #5
Boost-Free Subee
Scooby Specialist
 
Member#: 61052
Join Date: May 2004
Chapter/Region: NESIC
Location: Nashua, NH
Vehicle:
1999 2.5 RS
White

Default

Download the free lecture off of N2performance.com on porting techniques. going "BIG" will slow down the air velocity in the port and actually hurt your performance. trust me, it's all physics (yes I'm a geek) that lecture will show you how to shape the port to get the desired result. you really don't have to remove that much metal, and simply flattening out the inner radius of any turn in the port (shape it like a D, with the flat part being the inner radius) will give you 10% more flow without even opening up the port.
Boost-Free Subee is offline   Reply With Quote
Old 08-24-2004, 10:32 AM   #6
cjfike
Scooby Newbie
 
Member#: 60116
Join Date: Apr 2004
Location: (ab)Normal IL
Vehicle:
1999 RS Coupe
Silver Thorn

Default

Thanks! very nice info!

So then, expansion (if any can be tolerated) would have to happen post cat(s)...

I will download the article and read it thoroughly.
cjfike is offline   Reply With Quote
Old 08-24-2004, 10:59 AM   #7
Boost-Free Subee
Scooby Specialist
 
Member#: 61052
Join Date: May 2004
Chapter/Region: NESIC
Location: Nashua, NH
Vehicle:
1999 2.5 RS
White

Default

no problem, man. glad I could help. any other questions, don't hesitate to throw out there. remember, the only ignorant people out there are the ones who already "know everything". 16 years of tuning, and I'm still learning every day!!!
Boost-Free Subee is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
N1 Exhaust on 2.2 Single-Port... Subie22 Normally Aspirated Powertrain 9 11-28-2006 04:47 PM
Run phase 1 dual port 2.2 heads on a phase 2 single port 2.2 block? wagonovsky Subaru Conversions 12 03-01-2006 10:27 AM
Warning for 2.2ltr Single Exhaust Port and Borla Kevin Thomas Normally Aspirated Powertrain 10 09-18-2005 10:20 PM
When did the 2.2L heads change to single exhaust ports? subysouth Normally Aspirated Powertrain 2 09-06-2001 12:25 AM
Does MRT make a single exhaust port header for the 2.2L? 96Lconversion Normally Aspirated Powertrain 4 03-14-2001 12:38 AM


All times are GMT -4. The time now is 06:04 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.