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Old 08-13-2010, 07:56 PM   #1
Harnicka
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2004 Impreza 2.5RST
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Default wrx engine with 2.5l heads

Has anyone heard of this build? wrx engine with sti heads?
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Old 08-13-2010, 08:23 PM   #2
EA82TRally
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I've never heard of it personally.
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Old 08-13-2010, 08:45 PM   #3
rexblake
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2.0L sb with 2.5L heads? New to me. Although I'm sure someone out there has done it.
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Old 08-13-2010, 09:09 PM   #4
Harnicka
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yeah it a unorthodox build but im wordering are they any kind of hidden potential with in it because it's just more air / displacement i think...not sure but hopefully someone did it out there
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Old 08-13-2010, 10:09 PM   #5
Concillian
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Mushroom tip is really not a very good combustion chamber design.

Not to mention the potential head gasket issues. 92mm bore with heads designed for 99.5mm bore is not going to end well.

The STi heads are not really a better design than the 2.0L heads. They are different, but not really better. Use STi cams on a 2.0L head if you want better breathing. get overseas 2.0L AVCS heads if you want AVCS.
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Old 08-13-2010, 10:16 PM   #6
prometheum
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you've never heard of it because it doesn't work
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Old 08-13-2010, 11:23 PM   #7
OrbitalEllipses
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Overseas AVCS heads? **** that! Get JDM bigport non-avcs heads. V6 or 7, I don't recall exactly.

AVCS is nice, but wiring it into a car that doesn't have it is a nightmare.
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Old 08-14-2010, 12:34 AM   #8
prometheum
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Quote:
Originally Posted by OrbitalEllipses View Post
Overseas AVCS heads? **** that! Get JDM bigport non-avcs heads. V6 or 7, I don't recall exactly.

AVCS is nice, but wiring it into a car that doesn't have it is a nightmare.
its not really that hard if you get a v7 jdm sti ecu or a standalone...that only requires running 4 wires.
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Old 08-14-2010, 01:28 AM   #9
OrbitalEllipses
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I don't often see the ECUs for sale. My engine's healthy, otherwise I'd look into bigport heads and 2.5 shortblock with forged pistons...I need more torque! I can only imagine what a CNC combustion chamber bigport head hybrid build would be like...
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