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Old 10-19-2005, 10:28 PM   #1
G.Subramaniam
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Default New 2006 WRX short blocks

What is the CR of these new 2006 2.5L shortblocks and will they bolt up to 2.2L SOHC heads ?
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Old 10-20-2005, 07:41 AM   #2
Tats
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Almost any head will bolt to almost any block.


Anyway.....yes they will bolt up. And your CR ratio will be dependent on the heads.

Assuming it's an EJ257 block:

EJ257 with SOHC heads approx 8.4:1 (since the sohc has 3cc more volume then the wrx heads according to Cobb)
EJ257 with WRX heads approx 8.6:1
EJ257 with STi heads approx 8.2:1

Not sure aout the 2.2 heads though.
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Old 10-20-2005, 08:42 AM   #3
G.Subramaniam
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I dont think the new WRX blocks are the same as the STI EJ257 block
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Old 10-20-2005, 01:14 PM   #4
lowblow
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Quote:
Originally Posted by G.Subramaniam
I dont think the new WRX blocks are the same as the STI EJ257 block
They are the same as the Forester XT block from what I have read
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Old 10-20-2005, 02:51 PM   #5
Lachlan
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I thought the ones in the WRXs were EJ255s?
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Old 10-20-2005, 09:20 PM   #6
G.Subramaniam
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So what is the CR of the FXT and the EJ255 ?
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Old 10-21-2005, 12:59 PM   #7
PHATsuby
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I have heard 9:1, go on to techinfo and get a pdf

Ben
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Old 10-21-2005, 01:11 PM   #8
kgb
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EJ255 and EJ257 differs only in the head last time I read
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Old 10-21-2005, 01:19 PM   #9
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so why do we care? are the shortblocks cheaper?
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Old 10-21-2005, 02:23 PM   #10
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Yes I would like to know.
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