06 WRX: Semi-closed or Open Block?

XaznPKdogX · 08-18-2005, 10:43 AM

Most of the people here believe the new WRX has a semi-closed block like the Legacy GT and STI but does anyone know for sure? I mean really, the truth?

From cars101:
2.5L boxer DOHC, 4 cylinder, 16 valves
Active Valve System
Turbocharged
Hood scoop air intake with Intercooler
Block and heads, Aluminum alloy. open deck design, with
cast iron cylinder liners
Sequential multi-port fuel injection
Bore: 99.5x79mm, 3.92x3.11
Redline 7000 rpm

Since the 06 are being sold or will be soon, I was hoping some of you may have real answers.

Lachlan · 08-18-2005, 11:03 AM

I have no authority here, but from some of the reading I've done I infer that "open" is sometimes used as an overarching term for semi-closed and open--i.e. if it's not (fully) closed, it's "open." If someone could confirm or deny I'd appreciate it.

flyinpig · 08-18-2005, 11:57 AM

SOA's WRX spec sheet, http://vocuspr.vocus.com/VocusPR30/T...WRX_Specs2.pdf says "semi-closed deck cylinder block design".

dwx · 08-18-2005, 12:14 PM

They aren't going to use one block for the LGT, FXT, and STI, and then use a different one for the WRX... It's a semi-closed block.

Templar · 08-18-2005, 01:55 PM

The part number for the complete shortblock is different than the others, however, the part number for the cylinder block is the same (11008AA930) so it has to be a semi-closed deck design.

I am currently looking into the other part numbers to see what else changed to warrant the shorblock having a different part number.

Templar · 08-18-2005, 02:19 PM

The pistons for the 06 WRX AND 06 Forester XT are a different part number than the 04-05 Forester XT, 04-06 STI, and 05-06 Legacy GTs and XTs.

The piston part number for the STIs, 04-05 Foresters, and all the 05 and up Turbo Legacys is 12006AC390.

The part number for the 06 WRX and 06 Forester is 12006AD210.

List price on either piston is $85.42

Other than that, the crank, rods and cylinder block are the same between all the turbo 2.5 models.

187 · 08-18-2005, 02:29 PM

How much cheaper are they than sti blocks?

Templar · 08-18-2005, 02:46 PM

List price on the STI block (10103AB440) is $1812.53

List price on the WRX block (10103AB630) is $1759.74 which is the same price the STI block was until July 1.

Most dealerships on NASIOC will sell them for quite a bit less than list...mine included.

Jon [in CT] · 08-18-2005, 03:27 PM

Maybe the change in pistons (relative to the 2005 2.5L turbo engines) might account for some of the increase in compression ratio (now 8.4:1 was 8.2:1).

187 · 08-18-2005, 03:43 PM

so its like 50 dollars for hypereuretic lol pistons? I was hoping for a bigger saving.

Templar · 08-18-2005, 04:35 PM

My guess is the pistons are still Hypereutectic, but have a different dish design. As John [inCT] mentioned, the compression ration is different on the 06 Forester.

WoohooRX · 08-18-2005, 04:44 PM

does that mean the new wrx's have the same engine (almost) as the sti's, just detuned?

Jon [in CT] · 08-18-2005, 05:34 PM

Quote:

Originally Posted by WoohooRX

does that mean the new wrx's have the same engine (almost) as the sti's, just detuned?

No, it means the new WRX has different pistons and different cylinder heads and different turbo and different intake manifold and different intercooler, etc.

Fuzz541 · 08-18-2005, 06:24 PM

This n00b gathers that you're talking complete shortblock pricing, right?

Templar · 08-18-2005, 07:43 PM

Correct, that pricing is for a complete shortblock, which is the cylinder block, crankshaft, connecting rods, pistons and all the necessary, bearings, rings, bolts, and clips.

subysouth · 08-18-2005, 07:51 PM

So is an 06+ WRX swap into an older Subaru gonna be just as complicated as an STi swap now - AVCS, drive by wire, immobilizer, etc?

ss

Templar · 08-18-2005, 09:19 PM

Quote:

Originally Posted by subysouth

So is an 06+ WRX swap into an older Subaru gonna be just as complicated as an STi swap now - AVCS, drive by wire, immobilizer, etc?

ss

Oh Yeah. Possibly more so if the secondary air pump is required and can't be bypassed easily.

subysouth · 08-19-2005, 01:03 AM

Quote:

Originally Posted by Templar

Oh Yeah. Possibly more so if the secondary air pump is required and can't be bypassed easily.

That sucks but thanks for the info.

ss

Chi_San · 08-19-2005, 11:13 PM

The only Open deck Subaru engines are the SOHC NA engines, right? The EJ251/2/3 are all Open, but the DOHC EJ22 is semi closed... Makes sense to me.

slvrwrx04 · 08-20-2005, 12:43 AM

I thought the EJ22 blocks on the turbo legacy and the 22b were closed deck blocks...and don't forget that the old EJ205 block was also an open-deck design.

Chi_San · 08-20-2005, 02:25 AM

I'm not sure about the 22b, but the EJ22T is semi-closed deck.

slvrwrx04 · 08-20-2005, 03:21 AM

After some researching, the EJ22T is a closed deck block.

http://forums.nasioc.com/forums/show...2t+closed+deck

08-18-2005, 10:43 AM	#1
XaznPKdogX Scooby Newbie Member#: 43568 Join Date: Sep 2003	06 WRX: Semi-closed or Open Block? Most of the people here believe the new WRX has a semi-closed block like the Legacy GT and STI but does anyone know for sure? I mean really, the truth? From cars101: 2.5L boxer DOHC, 4 cylinder, 16 valves Active Valve System Turbocharged Hood scoop air intake with Intercooler Block and heads, Aluminum alloy. open deck design, with cast iron cylinder liners Sequential multi-port fuel injection Bore: 99.5x79mm, 3.92x3.11 Redline 7000 rpm Since the 06 are being sold or will be soon, I was hoping some of you may have real answers.

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08-18-2005, 11:03 AM	#2
Lachlan Scooby Specialist Member#: 19470 Join Date: May 2002 Chapter/Region: SWIC Location: albuquerque, NM Vehicle: 1981 Brat GL Blue	I have no authority here, but from some of the reading I've done I infer that "open" is sometimes used as an overarching term for semi-closed and open--i.e. if it's not (fully) closed, it's "open." If someone could confirm or deny I'd appreciate it.

08-18-2005, 11:57 AM	#3
flyinpig Scooby Specialist Member#: 43640 Join Date: Sep 2003 Location: usa Vehicle: 2015 Levorg sedan	SOA's WRX spec sheet, http://vocuspr.vocus.com/VocusPR30/T...WRX_Specs2.pdf says "semi-closed deck cylinder block design".

08-18-2005, 12:14 PM	#4
dwx Scooby Guru Member#: 8343 Join Date: Jul 2001 Chapter/Region: MWSOC Location: Atlanta, GA Vehicle: 2005 2012 Jeep 2013 DGM BRZ	They aren't going to use one block for the LGT, FXT, and STI, and then use a different one for the WRX... It's a semi-closed block.

08-18-2005, 01:55 PM	#5
Templar Scooby Specialist Member#: 483 Join Date: Nov 1999 Chapter/Region: South East Location: A twisty road not near you. Vehicle: 2010 RSV4 Aprilia Racing Black	The part number for the complete shortblock is different than the others, however, the part number for the cylinder block is the same (11008AA930) so it has to be a semi-closed deck design. I am currently looking into the other part numbers to see what else changed to warrant the shorblock having a different part number.

08-18-2005, 02:19 PM	#6
Templar Scooby Specialist Member#: 483 Join Date: Nov 1999 Chapter/Region: South East Location: A twisty road not near you. Vehicle: 2010 RSV4 Aprilia Racing Black	The pistons for the 06 WRX AND 06 Forester XT are a different part number than the 04-05 Forester XT, 04-06 STI, and 05-06 Legacy GTs and XTs. The piston part number for the STIs, 04-05 Foresters, and all the 05 and up Turbo Legacys is 12006AC390. The part number for the 06 WRX and 06 Forester is 12006AD210. List price on either piston is $85.42 Other than that, the crank, rods and cylinder block are the same between all the turbo 2.5 models.

08-18-2005, 02:29 PM	#7
187 Scooby Newbie Member#: 51427 Join Date: Dec 2003	How much cheaper are they than sti blocks?

08-18-2005, 02:46 PM	#8
Templar Scooby Specialist Member#: 483 Join Date: Nov 1999 Chapter/Region: South East Location: A twisty road not near you. Vehicle: 2010 RSV4 Aprilia Racing Black	List price on the STI block (10103AB440) is $1812.53 List price on the WRX block (10103AB630) is $1759.74 which is the same price the STI block was until July 1. Most dealerships on NASIOC will sell them for quite a bit less than list...mine included.

08-18-2005, 03:27 PM	#9
Jon [in CT] * Banned * Member#: 2992 Join Date: Nov 2000 Chapter/Region: NESIC Location: Connecticut, USA Vehicle: 02 WRX Sedan Silver	Maybe the change in pistons (relative to the 2005 2.5L turbo engines) might account for some of the increase in compression ratio (now 8.4:1 was 8.2:1).

08-18-2005, 03:43 PM	#10
187 Scooby Newbie Member#: 51427 Join Date: Dec 2003	so its like 50 dollars for hypereuretic lol pistons? I was hoping for a bigger saving.

08-18-2005, 04:35 PM	#11
Templar Scooby Specialist Member#: 483 Join Date: Nov 1999 Chapter/Region: South East Location: A twisty road not near you. Vehicle: 2010 RSV4 Aprilia Racing Black	My guess is the pistons are still Hypereutectic, but have a different dish design. As John [inCT] mentioned, the compression ration is different on the 06 Forester.

08-18-2005, 04:44 PM	#12
WoohooRX Scooby Newbie Member#: 70296 Join Date: Sep 2004 Chapter/Region: Tri-State Location: nyc Vehicle: 04 WRX rally blue	does that mean the new wrx's have the same engine (almost) as the sti's, just detuned?

08-18-2005, 06:24 PM	#14
Fuzz541 Scooby Specialist Member#: 4739 Join Date: Mar 2001 Chapter/Region: NESIC Location: Jiangxi, China	This n00b gathers that you're talking complete shortblock pricing, right?

08-18-2005, 07:43 PM	#15
Templar Scooby Specialist Member#: 483 Join Date: Nov 1999 Chapter/Region: South East Location: A twisty road not near you. Vehicle: 2010 RSV4 Aprilia Racing Black	Correct, that pricing is for a complete shortblock, which is the cylinder block, crankshaft, connecting rods, pistons and all the necessary, bearings, rings, bolts, and clips.

08-18-2005, 07:51 PM	#16
subysouth Scooby Guru Member#: 5039 Join Date: Mar 2001 Chapter/Region: South East Location: Ocean Springs, MS Vehicle: 2007 Outback XT Grey 5-speed (sold)	So is an 06+ WRX swap into an older Subaru gonna be just as complicated as an STi swap now - AVCS, drive by wire, immobilizer, etc? ss

08-19-2005, 11:13 PM	#19
Chi_San Scooby Guru Member#: 53558 Join Date: Jan 2004 Chapter/Region: NWIC Location: Deadford, OR Vehicle: 2005 Baja Turbo White/Silver/Black 3tone	The only Open deck Subaru engines are the SOHC NA engines, right? The EJ251/2/3 are all Open, but the DOHC EJ22 is semi closed... Makes sense to me.

08-20-2005, 12:43 AM	#20
slvrwrx04 Scooby Specialist Member#: 58058 Join Date: Mar 2004 Chapter/Region: SCIC Location: San Diego, CA Vehicle: 2014 STI Sedan Satin White Pearl	I thought the EJ22 blocks on the turbo legacy and the 22b were closed deck blocks...and don't forget that the old EJ205 block was also an open-deck design.

08-20-2005, 02:25 AM	#21
Chi_San Scooby Guru Member#: 53558 Join Date: Jan 2004 Chapter/Region: NWIC Location: Deadford, OR Vehicle: 2005 Baja Turbo White/Silver/Black 3tone	I'm not sure about the 22b, but the EJ22T is semi-closed deck.

08-20-2005, 03:21 AM	#22
slvrwrx04 Scooby Specialist Member#: 58058 Join Date: Mar 2004 Chapter/Region: SCIC Location: San Diego, CA Vehicle: 2014 STI Sedan Satin White Pearl	After some researching, the EJ22T is a closed deck block. http://forums.nasioc.com/forums/show...2t+closed+deck