Welcome to the North American Subaru Impreza Owners Club Friday August 28, 2015
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 > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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 01-21-2010, 10:21 AM   #1
stitchbad
Scooby Newbie
 
Member#: 177527
Join Date: Apr 2008
Chapter/Region: W. Canada
Location: Edmonton Canada
Vehicle:
2004 STI
Silver

Default 04-06 STI short block= 08 STI short block

I've been trying to find out if the 08STI short block is the same as the 04-06 STI short block but I haven't found anything. So does anybody know if they are or what the diffrence is between them. Any info would great.

Thanks
* Registered users of the site do not see these ads.
stitchbad is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-21-2010, 11:47 AM   #2
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

The short block casting, or the full assembly? As far as I know the casting is the same, but the full assembly isn't. I believe the pistons and rods are the same, the crank is nitrided (or was that the 09? I forget), and the oil pump is larger for the dual AVCS.
the suicidal eggroll is offline   Reply With Quote
Old 01-21-2010, 12:34 PM   #3
Danomite
Scooby Newbie
 
Member#: 190449
Join Date: Sep 2008
Chapter/Region: MWSOC
Location: breathin down yo neck foo
Vehicle:
2008 RAW motor/Ah2nD
Aspen White

Default

i think the nitrided crank started in 09.
Danomite is offline   Reply With Quote
Old 01-21-2010, 01:35 PM   #4
stitchbad
Scooby Newbie
 
Member#: 177527
Join Date: Apr 2008
Chapter/Region: W. Canada
Location: Edmonton Canada
Vehicle:
2004 STI
Silver

Default

Complete short block, I'm building a new motor for 04 STI and want know if the 08 block will work and if there's an advantage to using it.
stitchbad is offline   Reply With Quote
Old 01-21-2010, 02:25 PM   #5
Danomite
Scooby Newbie
 
Member#: 190449
Join Date: Sep 2008
Chapter/Region: MWSOC
Location: breathin down yo neck foo
Vehicle:
2008 RAW motor/Ah2nD
Aspen White

Default

it will work fine but at least do some drop in pistons.

know what i'm sayin.
Danomite is offline   Reply With Quote
Old 01-21-2010, 02:36 PM   #6
Prevent
*** Banned ***
 
Member#: 149114
Join Date: May 2007
Location: I'm too mainstream
Default

09 sti block cylinder walls a slightly thicker.. I think by 1mm.

When i measured 04-07 it was about 9mm thick, 09 i thnk is 10mm. (should have wrote this **** down)

obviously as above 09 crank is nitrided because subaru either stopped or decreased using lead in some bearings (environmental speel)
Prevent is offline   Reply With Quote
Old 01-21-2010, 02:40 PM   #7
RallySport Direct
NASIOC Storefront Vendor
 
Member#: 33174
Join Date: Feb 2003
Chapter/Region: RMIC
Location: Salt Lake City Utah
Vehicle:
We are Open Late!
888-457-2559 Every day!

Default

Subaru also changed the casting process in 2007. Went from the 702 to the 703.
The 703 Castings are allot smoother inside the passages, making them more efficient to fluid flow internally.
RallySport Direct is offline   Reply With Quote
Old 01-21-2010, 03:39 PM   #8
john 1badSTI
Scooby Specialist
 
Member#: 77470
Join Date: Dec 2004
Chapter/Region: MWSOC
Location: grove city ohio
Vehicle:
04 sti 10.51@138.5
on e85@ 30psi--spinning

Default

also you will have to decide on which oil pump to use because it does not come on a new shortblock.
john 1badSTI is offline   Reply With Quote
Old 01-21-2010, 03:40 PM   #9
stitchbad
Scooby Newbie
 
Member#: 177527
Join Date: Apr 2008
Chapter/Region: W. Canada
Location: Edmonton Canada
Vehicle:
2004 STI
Silver

Default

So then the 08 sti block will work in any 04 sti with 04 sti heads.
stitchbad is offline   Reply With Quote
Old 01-21-2010, 03:49 PM   #10
john 1badSTI
Scooby Specialist
 
Member#: 77470
Join Date: Dec 2004
Chapter/Region: MWSOC
Location: grove city ohio
Vehicle:
04 sti 10.51@138.5
on e85@ 30psi--spinning

Default

yes it will work fine
john 1badSTI is offline   Reply With Quote
Old 01-22-2010, 06:08 AM   #11
AlexTRD
Scooby Newbie
 
Member#: 135627
Join Date: Dec 2006
Chapter/Region: SWIC
Location: Peoria, AZ
Vehicle:
2005 WRX td06-20g
WRB v8 ej207/C32 AMG

Default

+1 on the 07+ motors having smoother castings. They is a very noticeable difference when comparing to older motors, much less burrs and sharp little edges. Theoretically those things can lead to the beginning of a stress spot, and are often where failures/breakage happens if it does.
AlexTRD is offline   Reply With Quote
Old 01-22-2010, 10:43 AM   #12
rexworx
Scooby Guru
 
Member#: 103232
Join Date: Dec 2005
Chapter/Region: Tri-State
Location: GTX3576R'dToy GTX3071R'dFXT DD
Vehicle:
MY05 GDA,MY04FXT6spd
PPG,Front LSD,4.44,E85

Default

Quote:
Originally Posted by Prevent View Post
09 sti block cylinder walls a slightly thicker.. I think by 1mm.

When i measured 04-07 it was about 9mm thick, 09 i thnk is 10mm. (should have wrote this **** down)

obviously as above 09 crank is nitrided because subaru either stopped or decreased using lead in some bearings (environmental speel)
Oh really, Interesting?
rexworx is offline   Reply With Quote
Old 01-22-2010, 10:49 AM   #13
rexworx
Scooby Guru
 
Member#: 103232
Join Date: Dec 2005
Chapter/Region: Tri-State
Location: GTX3576R'dToy GTX3071R'dFXT DD
Vehicle:
MY05 GDA,MY04FXT6spd
PPG,Front LSD,4.44,E85

Default

Edit: Bad info on my part sorry...

Last edited by rexworx; 01-22-2010 at 11:22 AM.
rexworx is offline   Reply With Quote
Old 01-22-2010, 10:52 AM   #14
the suicidal eggroll
Scooby Guru
 
Member#: 51961
Join Date: Jan 2004
Chapter/Region: RMIC
Location: Broomfield, CO
Vehicle:
2005 STi
2012 WRX

Default

Quote:
Originally Posted by rexworx View Post
Oh really, Interesting?

07+ 2.5 turbo blocks also have two crankcase breather ports. The primary one next to the turbo for the PCV system, and a second on the block is below the throttlebody.

As I understand the 04-06 only has the primary PCV breather.


Edit: opps double post...
All of them have the 2nd breather, it's just the 2.0 that only has one.
the suicidal eggroll is offline   Reply With Quote
Old 01-22-2010, 11:21 AM   #15
rexworx
Scooby Guru
 
Member#: 103232
Join Date: Dec 2005
Chapter/Region: Tri-State
Location: GTX3576R'dToy GTX3071R'dFXT DD
Vehicle:
MY05 GDA,MY04FXT6spd
PPG,Front LSD,4.44,E85

Default

They do? Well Im a dumbass sorry...
rexworx 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
07 STi Limited or 08 STi? Manvir General Community 67 08-22-2009 10:23 PM
WTB: Spearco STI Tmic or 08+ STI stock Tmic unclemat Private 'Wanted' Classifieds 3 03-04-2009 05:03 PM
trading in my 06 wrx for an 08 sti? DCsubieSTI Newbies & FAQs 16 01-13-2009 07:18 PM
Can you swap 07 sti seats with 08 sti seats? subaru110 Interior & Exterior Modification 5 07-18-2008 02:08 AM
AP V2 for 04-06 2.5l and 07 STI V8This Engine/Power/Exhaust 3 11-15-2007 10:24 PM


All times are GMT -4. The time now is 04:30 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.