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03-17-2013, 06:04 PM | #1 |
Scooby Specialist
Member#: 104098
Join Date: Jan 2006
Chapter/Region:
NWIC
Location: Eastern WA
Vehicle:97' LGT 2.3 Dstroke Rotated BW S256 6speed |
07'-09' Legacy shortblock with phase I 2.5 DOHC Heads
I've searched a bunch and no specific help.
I have a 07'-09' phase II N/A short block with low low miles and want to put some 97' legacy DOHC heads on it. The thing I'm unsure of is if the pistons will work with those combustion chambers, as they pop up out of the block a little. I'm not worried about the compression too much, but rather if it will interfere or not. Anybody been down this trail before? Thanks! |
03-24-2013, 07:14 AM | #2 |
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Join Date: Aug 2005
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NESIC
Location: S. Maine
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Are the pistons domed? If so, then no they wont work. You can swap in P1 pistons and that will work.
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03-24-2013, 08:35 AM | #3 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
The EJ25D pistons also protruded from the deck, too, but only by 0.05mm (which was less than the head gasket thickness by quite a bit).
How does the '07-09 compare to that? |
03-25-2013, 02:00 PM | #4 |
Scooby Specialist
Member#: 104098
Join Date: Jan 2006
Chapter/Region:
NWIC
Location: Eastern WA
Vehicle:97' LGT 2.3 Dstroke Rotated BW S256 6speed |
They seem to pop out past the Deck quite a ways. I've been told by another source that it will not work.
I just picked up a 99' Forester with a phase II EJ25 (spun bearing) with 53K original miles. If the heads look good, I might just use it for that....asuming it will work with those heads? |
03-25-2013, 02:47 PM | #5 |
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RMIC
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Vehicle:99 2.5RS, '85 911 '73 914 and 2012 BRZ |
They'll hit. The newer 2.5i pistons are way too domed.
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03-25-2013, 10:32 PM | #6 |
Scooby Specialist
Member#: 104098
Join Date: Jan 2006
Chapter/Region:
NWIC
Location: Eastern WA
Vehicle:97' LGT 2.3 Dstroke Rotated BW S256 6speed |
Do you think it will work on a 99' forester with the first of the phaseII motors?
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03-26-2013, 12:42 PM | #7 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Yes. There are plenty of examples of folks using the DOHC heads on the '99-05(ish) Phase II blocks, myself included.
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04-21-2013, 12:33 PM | #8 |
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Join Date: Aug 2005
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Location: S. Maine
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Pat, the pistons dont protude, they are domed and the combustion chamber has a different shape. His '07 shortblock wont work with either set of heads he mentioned. Id be careful just throwing out incorrect info like that...
Heres a pic |
04-21-2013, 05:23 PM | #9 | ||
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Quote:
Quote:
If you can point out what I said was incorrect, that would be great. |
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04-21-2013, 06:57 PM | #10 | |
Scooby Specialist
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Join Date: Aug 2005
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Location: S. Maine
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Quote:
a '99 shortblock was never mentioned, only shortblock he ever asked about was the '07. He clearly mentioned that his '99 Forester has a spun bearing... You obviously misread into that post. |
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04-23-2013, 09:01 PM | #11 |
Scooby Specialist
Member#: 104098
Join Date: Jan 2006
Chapter/Region:
NWIC
Location: Eastern WA
Vehicle:97' LGT 2.3 Dstroke Rotated BW S256 6speed |
So the 07' shortblock won't work with the 99' Forester heads either? I'm just about to tear into this project and hoped the 07' block would make it duck soup.
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04-21-2013, 06:24 PM | #12 |
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Let me at those newer pistons with my porting bit. I'll make it work!
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