Subaru Cylinder Head Info+ Specs

cribbie · 12-17-2008, 08:07 AM

Hello, does anyone know if there is a link on NASIOC or anywhere else that states all of Subaru's cylinder head specs? ie: combustion chamber, and valve sizes etc etc?
I am more interested in the specs for Turbo application heads like:
WRX
STi: if they changed anything from year to year
Leggy Turbo phase 1 (ej22t)

Thanks for your help!

Cheers..

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Maxwell Power · 12-17-2008, 01:11 PM

That's really a lot of data.
If you tell us exactly what you are trying to figure out, we could probably point you in the right direction.
For starters, give us a range of years and a displacement or casting number.
For example, the STi in the USA is 2.5L and therefore would not be the same as a JDM STi.

Here's some data:
B25 casting (04-06 USDM STi) 36mm intake, 32mm exhaust 57cc chamber.
D25 casting (06-07 USDM WRX) 36mm intake, 32mm exhaust 50cc chamber.
S20 casting (02-05 USDM WRX) 36mm intake, 32mm exhaust 49.5cc chamber.

You can see that the displacement for the engine is in the casting number:
D25 = 2.5L
S20 = 2.0L

cribbie · 12-17-2008, 06:02 PM

Thanks for that info....

Specifically I am looking for:
USDM STi specs ( 04- current)
USDM WRX specs (02-05)
JDM STI 2.0L spec

Rasmusson14 · 12-17-2008, 06:46 PM

Quote:

Originally Posted by cribbie

Thanks for that info....

Specifically I am looking for:
USDM STi specs ( 04- current)
USDM WRX specs (02-05)
JDM STI 2.0L spec

I too would like this info. But I do know that there was a change during the V7/V8 change over. The Spec C V7 Heads were "big ports" while the rest of the V7's were the ?same? (I think) as the current WRX casting. Where all Ver. 8 heads are "Big Port" but I have no idea if there was any change in the chamber volume or valves used.

cribbie · 12-17-2008, 08:16 PM

I will try to use my "telekinesis" powers to call on Maxwell Propulsion to answer this question!!!!

mick_the_ginge · 12-17-2008, 08:27 PM

Quote:

Originally Posted by cribbie

I will try to use my "telekinesis" powers to call on Maxwell Propulsion to answer this question!!!!

A "search" works just as well, these should help.

Old posts from the "sponaugle"

WRX/STI/JDM Head specs
http://forums.nasioc.com/forums/showthread.php?t=630797

07 head info
http://forums.nasioc.com/forums/show....php?t=1413998

I also found these:

Stock Cam spec's

http://forums.nasioc.com/forums/showthread.php?t=419230

And my personal favorite and nothing to do with the OP's question:

"Boohaahaa - Now that, my friends ,is a turbo! " from 2004

http://forums.nasioc.com/forums/showthread.php?t=674602

Jeff Sponaugle has always been infront of the curve

ddrule5 · 08-14-2011, 12:51 PM

how much can i mill off a 2006 2.5 v25 head?

kelvo733 · 11-21-2018, 11:53 PM

Anyone know the CC volume for w25 heads?

12-17-2008, 08:07 AM	#1
cribbie Scooby Specialist Member#: 184505 Join Date: Jul 2008 Chapter/Region: E. Canada Location: Ontario Vehicle: 2003 WRX Sonic yellow	Subaru Cylinder Head Info+ Specs Hello, does anyone know if there is a link on NASIOC or anywhere else that states all of Subaru's cylinder head specs? ie: combustion chamber, and valve sizes etc etc? I am more interested in the specs for Turbo application heads like: WRX STi: if they changed anything from year to year Leggy Turbo phase 1 (ej22t) Thanks for your help! Cheers.. * Registered users of the site do not see these ads.

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12-17-2008, 01:11 PM	#2
Maxwell Power Former Vendor Member#: 190729 Join Date: Oct 2008 Chapter/Region: NWIC Location: Marysville, WA	That's really a lot of data. If you tell us exactly what you are trying to figure out, we could probably point you in the right direction. For starters, give us a range of years and a displacement or casting number. For example, the STi in the USA is 2.5L and therefore would not be the same as a JDM STi. Here's some data: B25 casting (04-06 USDM STi) 36mm intake, 32mm exhaust 57cc chamber. D25 casting (06-07 USDM WRX) 36mm intake, 32mm exhaust 50cc chamber. S20 casting (02-05 USDM WRX) 36mm intake, 32mm exhaust 49.5cc chamber. You can see that the displacement for the engine is in the casting number: D25 = 2.5L S20 = 2.0L

12-17-2008, 06:02 PM	#3
cribbie Scooby Specialist Member#: 184505 Join Date: Jul 2008 Chapter/Region: E. Canada Location: Ontario Vehicle: 2003 WRX Sonic yellow	Thanks for that info.... Specifically I am looking for: USDM STi specs ( 04- current) USDM WRX specs (02-05) JDM STI 2.0L spec

12-17-2008, 08:16 PM	#5
cribbie Scooby Specialist Member#: 184505 Join Date: Jul 2008 Chapter/Region: E. Canada Location: Ontario Vehicle: 2003 WRX Sonic yellow	I will try to use my "telekinesis" powers to call on Maxwell Propulsion to answer this question!!!!

08-14-2011, 12:51 PM	#7
ddrule5 Scooby Newbie Member#: 291362 Join Date: Aug 2011	how much can i mill off a 2006 2.5 v25 head?

11-21-2018, 11:53 PM	#8
kelvo733 Scooby Newbie Member#: 481801 Join Date: Feb 2018 Vehicle: 2011 STI	Anyone know the CC volume for w25 heads?