Welcome to the North American Subaru Impreza Owners Club Thursday July 10, 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 > Built Motor Discussion

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 05-04-2006, 10:29 PM   #1
kinger
Scooby Newbie
 
Member#: 49328
Join Date: Nov 2003
Location: Iowa
Vehicle:
2004 WRB/Gold STI

Default Port and Polished heads

What vendors are good and what is a good value on the service? There are lots of different 'levels' out there. Just fishing for everyones opinion. Thanks!
kinger is offline   Reply With Quote
Old 05-05-2006, 01:26 PM   #2
ejsportcom
Scooby Specialist
 
Member#: 88905
Join Date: Jun 2005
Chapter/Region: Tri-State
Location: in the drivers seat....
Default

cobb does very nice work you should check them out, they have alot of info on their site.
ejsportcom is offline   Reply With Quote
Old 05-05-2006, 07:54 PM   #3
testes1010
Scooby Specialist
 
Member#: 47145
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: Henderson, KY
Vehicle:
2012 Gas Saver

Default

my jdm v8 heads are at Crucial getting P&P'd, 3angle valve job...Helix cams & valvetrain w/ 1mm over Supertech valves...
testes1010 is offline   Reply With Quote
Old 05-05-2006, 08:22 PM   #4
car_cursed
Scooby Guru
 
Member#: 85327
Join Date: Apr 2005
Chapter/Region: RMIC
Location: West Jordan, UT
Vehicle:
More projects than
you can shake a stick at.

Default

Cobb's machine shop does nice work, if you want who does cobb's work contact pro machine in salt lake, or ask ron at axis about his machinist here in salt lake too.
car_cursed is offline   Reply With Quote
Old 05-06-2006, 10:09 PM   #5
Jeremy@Cobb
Scooby Newbie
 
Member#: 106514
Join Date: Feb 2006
Default

Quote:
Originally Posted by car_cursed
Cobb's machine shop does nice work, if you want who does cobb's work contact pro machine in salt lake, or ask ron at axis about his machinist here in salt lake too.

I'm afraid you are mistaken. Our headwork/machining is done in house.. as we have our own valve grinder and tools. Note our heads are cnc ported.

-Jeremy.
Jeremy@Cobb is offline   Reply With Quote
Old 05-07-2006, 01:30 AM   #6
ejsportcom
Scooby Specialist
 
Member#: 88905
Join Date: Jun 2005
Chapter/Region: Tri-State
Location: in the drivers seat....
Default

Quote:
Originally Posted by Jeremy@Cobb
Note our heads are cnc ported.
That makes all the difference, i don't care how well someone can port by hand, you will never match the consistancy of cnc. on that note when I'm done being broke, my spare set of wrx heads are going to cobb
ejsportcom is offline   Reply With Quote
Old 05-07-2006, 05:16 AM   #7
scooby-stu
Scooby Specialist
 
Member#: 52890
Join Date: Jan 2004
Location: Meniffe,CA
Default

Allhe name brands have a rep but also look into the ones that have the least issues and take a lot of pride in there work, Then you know for sure yours just aint just a production line type
scooby-stu is offline   Reply With Quote
Old 05-10-2006, 07:40 AM   #8
Wagun
Scooby Newbie
 
Member#: 106433
Join Date: Jan 2006
Location: Arkansas
Vehicle:
2004 WRX wagon
silver

Default

Quote:
Originally Posted by ejsportcom
That makes all the difference, i don't care how well someone can port by hand, you will never match the consistancy of cnc. on that note when I'm done being broke, my spare set of wrx heads are going to cobb
I'm sure someone will correct if I'm incorrect but I believe all porting jobs are first done by hand and a CNC machine is used to duplicate the best port job as determined by trial and error on a flow bench.
Wagun is offline   Reply With Quote
Old 05-08-2006, 10:12 AM   #9
kinger
Scooby Newbie
 
Member#: 49328
Join Date: Nov 2003
Location: Iowa
Vehicle:
2004 WRB/Gold STI

Default

Quote:
Originally Posted by Jeremy@Cobb
Note our heads are cnc ported.

-Jeremy.
What part of the ports are ported using the CNC machine, how does the bit get in there? Specfically the hard bend the one exhaust port takes to exit near the first port. Thanks
kinger is offline   Reply With Quote
Old 05-17-2006, 12:40 AM   #10
Jeremy@Cobb
Scooby Newbie
 
Member#: 106514
Join Date: Feb 2006
Default

Quote:
Originally Posted by kinger
What part of the ports are ported using the CNC machine, how does the bit get in there? Specfically the hard bend the one exhaust port takes to exit near the first port. Thanks
I will take detailed pictures of the ports, when I get back from the Wicked Big Subaru Meet. You would be surprised what a 5 axis CNC can do along with the small bits.

Jeremy.
Jeremy@Cobb is offline   Reply With Quote
Old 06-19-2006, 01:00 PM   #11
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

Quote:
Originally Posted by Jeremy@Cobb
I will take detailed pictures of the ports, when I get back from the Wicked Big Subaru Meet. You would be surprised what a 5 axis CNC can do along with the small bits.

Jeremy.
yup...it will blow your mind!!! I love 5-axis cnc's!!!

now if I could only afford one
Homemade WRX is offline   Reply With Quote
Old 05-05-2006, 08:28 PM   #12
White 2.5rs
Scooby Guru
 
Member#: 39936
Join Date: Jul 2003
Vehicle:
99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

Default

gruppe-s
White 2.5rs is offline   Reply With Quote
Old 05-05-2006, 08:49 PM   #13
Blackboxracing
Scooby Newbie
 
Member#: 90106
Join Date: Jun 2005
Location: long island, NY
Default

how much power could you expect to see with p&p your heads? i realize i will vary with power but i am just interested in a ballpark number for an ihi turbo/meth setup
Blackboxracing is offline   Reply With Quote
Old 05-05-2006, 08:54 PM   #14
car_cursed
Scooby Guru
 
Member#: 85327
Join Date: Apr 2005
Chapter/Region: RMIC
Location: West Jordan, UT
Vehicle:
More projects than
you can shake a stick at.

Default

i would say with just pnp, and no cams, around 20hp.
car_cursed is offline   Reply With Quote
Old 05-05-2006, 08:54 PM   #15
Silverpike
Scooby Newbie
 
Member#: 92399
Join Date: Jul 2005
Location: San Jose, CA
Vehicle:
02 Bugeye
WRB

Default

Quote:
Originally Posted by kinger
What vendors are good and what is a good value on the service? There are lots of different 'levels' out there. Just fishing for everyones opinion. Thanks!
This is a very good question. I am used to seeing comparisons of headwork by seeing photos of the finished heads. I have seen enough headwork to be a good judge of what works and what doesn't.

I am surprised that none of the major subie vendors have released any information about their headwork. No photos, CFM charts, or dyno plots. I have seen some real low-rez pics, and some anecdotal info, but nothing that constitues real information.

What does it take to get real data here on NASIOC?
Silverpike is online now   Reply With Quote
Old 05-05-2006, 09:54 PM   #16
Blackboxracing
Scooby Newbie
 
Member#: 90106
Join Date: Jun 2005
Location: long island, NY
Default

Quote:
Originally Posted by Silverpike
This is a very good question. I am used to seeing comparisons of headwork by seeing photos of the finished heads. I have seen enough headwork to be a good judge of what works and what doesn't.

I am surprised that none of the major subie vendors have released any information about their headwork. No photos, CFM charts, or dyno plots. I have seen some real low-rez pics, and some anecdotal info, but nothing that constitues real information.

What does it take to get real data here on NASIOC?

agreed, i would love to see a cfm chart comparison of jdm heads, worked heads, stockers......
isnt it worth a the sales to vendors to supply info?? and those of you with worked heads, any numbers? (haha i know som1 is gunna tell me to search, but i really havnt had much luck)
Blackboxracing is offline   Reply With Quote
Old 05-06-2006, 11:17 AM   #17
ejsportcom
Scooby Specialist
 
Member#: 88905
Join Date: Jun 2005
Chapter/Region: Tri-State
Location: in the drivers seat....
Default

Quote:
Originally Posted by Blackboxracing
agreed, i would love to see a cfm chart comparison of jdm heads, worked heads, stockers......
isnt it worth a the sales to vendors to supply info?? and those of you with worked heads, any numbers? (haha i know som1 is gunna tell me to search, but i really havnt had much luck)
cobb and axis both have numbers on their sites, you just have to look for them.....
ejsportcom is offline   Reply With Quote
Old 05-05-2006, 08:57 PM   #18
testes1010
Scooby Specialist
 
Member#: 47145
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: Henderson, KY
Vehicle:
2012 Gas Saver

Default

Crucial supplied me numbers w/ modded WRX heads....although at the time I do not believe they had p&p'd any big port heads...
testes1010 is offline   Reply With Quote
Old 05-06-2006, 05:40 PM   #19
petawabit
Scooby Specialist
 
Member#: 18978
Join Date: May 2002
Chapter/Region: SCIC
Location: orange county, CA
Vehicle:
96 brighton
05 AP2 ,09 GE8

Default


Dan curves are ported wrx heads
Pat are semi ported jdm v7 heads

Pat1 is stock v7
pa1 is multi angle valve job?
pat2 is multi angle valve job+pnp
pat3 is pat2 with more pnp of heads

Heads ported at DPR racing in Torrance. Dan does fantastic work and is a very knowledgable person. He still needs to add the larger valves as well
petawabit is offline   Reply With Quote
Old 05-18-2006, 04:32 PM   #20
bboy
Scooby Specialist
 
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

Quote:
Originally Posted by petawabit
Heads ported at DPR racing in Torrance. Dan does fantastic work and is a very knowledgable person. He still needs to add the larger valves as well
What do you think Jeremy? Dan does good work?

I think whatever you do, have them flow tested to make sure they flow evenly. You don't need a lean outlier.
bboy is offline   Reply With Quote
Old 05-06-2006, 09:53 PM   #21
Blackboxracing
Scooby Newbie
 
Member#: 90106
Join Date: Jun 2005
Location: long island, NY
Default

awsome post
Blackboxracing is offline   Reply With Quote
Old 05-06-2006, 10:14 PM   #22
Beer
Scooby Newbie
 
Member#: 114254
Join Date: May 2006
Default

I know cobb does very very good work, but Cosworth does pretty good stuff too but of course your gonna pay for Cosworth's name aswell, but i can only attest to cobb's work because its the only one ive dealt with personally
Beer is offline   Reply With Quote
Old 05-08-2006, 01:32 PM   #23
car_cursed
Scooby Guru
 
Member#: 85327
Join Date: Apr 2005
Chapter/Region: RMIC
Location: West Jordan, UT
Vehicle:
More projects than
you can shake a stick at.

Default

okay, well last time i was at pro machine, there were heads there that said they were for cobb but that was before the move.
car_cursed is offline   Reply With Quote
Old 05-10-2006, 05:25 PM   #24
PeteDucati
Scooby Specialist
 
Member#: 44629
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: '04WRX-Axis ej257, IPT 4eat.
Vehicle:
CNC 'd heads, cams
DB18g/EWG - F/S $8K

Default

RalliSpec in NJ uses a CNC program based on heavily ported v7 STi heads adapted for the WRX castings. I don't know the name of the shop that does the CNC work - but I do know it took almost 2 months to get my heads ported, the valves recessed, and the Crower cams installed - all for $1500. Since they recess the valves I didn't have to buy new buckets.
PeteDucati is offline   Reply With Quote
Old 05-10-2006, 05:57 PM   #25
303WRX
Scooby Newbie
 
Member#: 35097
Join Date: Apr 2003
Chapter/Region: RMIC
Location: Thornton, CO
Vehicle:
2002 WRX Sedan
PSM

Default

Quote:
Originally Posted by PeteDucati
RalliSpec in NJ uses a CNC program based on heavily ported v7 STi heads adapted for the WRX castings. I don't know the name of the shop that does the CNC work - but I do know it took almost 2 months to get my heads ported, the valves recessed, and the Crower cams installed - all for $1500. Since they recess the valves I didn't have to buy new buckets.
When you say recess the valves, did they back cut the stems to shorten them?
303WRX 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
port and polish heads living4surf South East Region Forum 1 09-27-2006 12:51 PM
port and polish heads? 93subi Normally Aspirated Powertrain 20 10-06-2005 02:47 AM
Socal ported and polished heads, Sard, Cusco, Sti, 350 hp package, gfb, and more! Turbo Juice Private 'For Sale' Classifieds 45 07-28-2005 04:55 PM
Ported and Polished heads redhat778 Factory 2.0L Turbo Powertrain 13 05-22-2004 07:27 PM
ej22 ported and polished heads 4sale dreromeo Private 'For Sale' Classifieds 1 12-13-2003 02:28 AM


All times are GMT -4. The time now is 05:23 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.