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Old 02-12-2008, 03:45 PM   #1
olsen726
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2.5i???

Default 2.5 sti motor, 2.5 wrx motor

what is the difference in the two motors? are they the same? or different, i know this is probably a noob question, but could somebody please explain the differences in the two motors
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Old 02-12-2008, 03:46 PM   #2
ultimate_wrx
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the 06/07 wrx engine has more potential if compairing stock internals.

but i think the 08 sti has them beat.
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Old 02-12-2008, 03:49 PM   #3
banjabi
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Quote:
Originally Posted by ultimate_wrx View Post
the 06/07 wrx engine has more potential if compairing stock internals.

but i think the 08 sti has them beat.
you got to be kidding me? you sound like you were born yesterday.

the sti has stronger stock internals than the wrx. if you're going to mod heavy with balls out performance, sti is most ideal. in the OPs case, if you're going for a swap, go with an sti swap - go big or go home.
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Old 02-12-2008, 03:51 PM   #4
mapleleaf
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Wrong Scooby Specialist.
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Old 02-12-2008, 03:53 PM   #5
dees421
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I think I read somewhere on here where the blocks are different. The STi has closed deck block and the WRX has a open deck block.
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Old 02-12-2008, 04:01 PM   #6
mapleleaf
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Same motors.
Different dish size on the piston.
STI 8.2 vs. WRX 8.4 CR
Some say the heads are minutely different.
It's been debated to death.
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Old 02-12-2008, 04:11 PM   #7
aboothman
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^^ I was under the impression the heads were different, because they have the same part # for the shortblocks.

Then again, they change little details every year....
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Old 02-12-2008, 04:13 PM   #8
nhat
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from what i've read:

same block
same internals
different heads which make for the 0.2 difference in CR
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Old 02-12-2008, 04:19 PM   #9
mapleleaf
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Quote:
Originally Posted by aboothman View Post
^^ I was under the impression the heads were different, because they have the same part # for the shortblocks.

Then again, they change little details every year....
The heads are a highly debated topic, I've never found any conclusive evidence myself, but I'm sure there is something out there.
From what I understand, the dish of the piston is sized slightly different which is what changes the CR.
I am by no means an expert.
If Nasioc's piece of **** search engine worked somewhat well, I might be able to find the threads debating this.

Anyone else want to try?
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Old 02-12-2008, 04:21 PM   #10
ultimate_wrx
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yeah nasiocs search feature does need an overhaul.
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Old 02-12-2008, 04:38 PM   #11
bindriftin
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^^^Not if you are patient...
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Old 02-12-2008, 04:45 PM   #12
bhhamblin
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the block is the same, same part number etc. i want to call SOA and ask them because i have been wondering this myself
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Old 02-12-2008, 05:18 PM   #13
Le Saboteur
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yeah there are no closed deck usdm wrx's or stis
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Old 02-12-2008, 05:20 PM   #14
DiscoGsus
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They are the same for anything most people want to do.
Both are semi-closed deck.
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Old 02-12-2008, 06:07 PM   #15
mapleleaf
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Quote:
Originally Posted by lukasandrew View Post
yeah there are no closed deck usdm wrx's or stis

I miss the old fully closed 2.2 cast iron block with oil squirters. That's a great motor.
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Old 02-12-2008, 07:17 PM   #16
munkis
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the short blocks are NOT the same part # and here is why

using an 07 wrx and 07 STi

WRX
Bore Stroke
mm (in)
99.5 79.0 (3.92 3.11)

Piston displacement
cm3 (cu in)
2,457 (149.94)

Compression ratio
8.4

WRX STi
Bore Stroke
mm (in)
99.5 79.0 (3.917 3.110)

Piston displacement
cm3 (cu in)
2,457 (150)

Compression ratio
8.2
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Old 02-12-2008, 07:22 PM   #17
munkis
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heads are also different
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Old 02-12-2008, 08:02 PM   #18
mapleleaf
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It gets hard to keep up with Subaru part #'s.
They change constantly. I've seen many Subaru parts that are indeed the identical part to one another, yet have different numbers. This can vary a great deal year to year. It's very difficult to get a conclusive answer.
I've seen EJ255 and EJ257 shortblocks from 2 different model years with the same part #.
Subaru is known to mix and match parts at times if one specific part is not avail. at the plant that day.
Volvo used to do that a lot at the plant in Halifax back in the day.
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Old 09-24-2008, 02:05 PM   #19
sponaugle
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Default

Quote:
Originally Posted by mapleleaf View Post
The heads are a highly debated topic, I've never found any conclusive evidence myself, but I'm sure there is something out there.
From what I understand, the dish of the piston is sized slightly different which is what changes the CR.
I am by no means an expert.
If Nasioc's piece of **** search engine worked somewhat well, I might be able to find the threads debating this.

Anyone else want to try?
Quote:
Originally Posted by bhhamblin View Post
the block is the same, same part number etc. i want to call SOA and ask them because i have been wondering this myself
Quote:
Originally Posted by mapleleaf View Post
It gets hard to keep up with Subaru part #'s.
They change constantly. I've seen many Subaru parts that are indeed the identical part to one another, yet have different numbers. This can vary a great deal year to year. It's very difficult to get a conclusive answer.
I've seen EJ255 and EJ257 shortblocks from 2 different model years with the same part #.
Subaru is known to mix and match parts at times if one specific part is not avail. at the plant that day.
Volvo used to do that a lot at the plant in Halifax back in the day.
Take a look at:

http://forums.nasioc.com/forums/show...1594587&page=2

Jeff
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Old 09-24-2008, 02:31 PM   #20
MannyMohawk#5
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Quote:
Originally Posted by mapleleaf View Post
I miss the old fully closed 2.2 cast iron block with oil squirters. That's a great motor.
it wasn't cast iron...
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