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Old 10-10-2010, 11:55 AM   #1
jester409
Scooby Newbie
 
Member#: 64376
Join Date: Jun 2004
Chapter/Region: South East
Location: TN
Vehicle:
04 WRX
WRB

Default ej205 or 2.5l hybrid ???

I bought an 04 WRX with 99k that has leaky valve seals which cause it to smoke a lot. It can't be driven in its current condition, so I am pulling the motor to either just replace/rebuild heads or possibly add hybrid 2.5L shortblock at same time. I have most of the parts for a 2.5L shortblock (253 block, 255 crank, 257 pistons and rods) but would still need a few things like bearings, STi oil pump and head gaskets, plus the cost of having a machine shop assemble it. I also have a 6MT, full catless exhaust, and Cobb AP that will be installed at time of engine replacement.

Is it worth it the added cost and tuning hassle to use the 2.5L sb? Up to this point I have only driven 2.5L NA and 3.0L NA Subarus, and I would appreciate any input from those who have driven both stock 2.0L and hybrid 2.5L turbo engine cars.

This will be my daily driver so reliability and MPG are slightly considered into the equation...
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Last edited by jester409; 10-10-2010 at 12:01 PM.
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Old 10-14-2010, 08:01 PM   #2
Shayhan27
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Member#: 205906
Join Date: Mar 2009
Chapter/Region: BAIC
Location: East Bay CA
Vehicle:
05 WRX
CGM

Default

If fuel economy is in the equasion I would still say do the hybrid with the heads CNC'd instead of the head gasket route. I would say throw in some cosworth 272's for the hell of it as I love mine but it will hurt your fuel economy.
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Old 10-19-2010, 07:50 PM   #3
jester409
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Member#: 64376
Join Date: Jun 2004
Chapter/Region: South East
Location: TN
Vehicle:
04 WRX
WRB

Default

I think that CNC'd chambers and more aggressive cams would probably be the best way to go. I may just get the 2.0L back together for now and over the next year build a 2.5L the right way as you are suggesting.
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