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Old 02-20-2006, 11:13 PM   #1
fastonthefly
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Member#: 105751
Join Date: Jan 2006
Cool 97 leg. gt engine conversion from 2.5-2.2

Curious if anyone has replaced a shortblock on a 2.5 with a 2.2? I don't mind if I lose a little performance. My questions are, what head gasket would I use, would the ecu mapping work, would the valves hit the pistons, would I get a check eng light. I work at an independent subaru shop so we have pleny of 2.2 engines. I don't like the fuel milage of this car. I'm hoping by putting in the smaller block the fuel milage might improve. Also, it seems like most 2.5's that I work on knock. My knocks and has 180k. If I'm going to fix the piston knock(or slap whatever you want to call it) then I should do rod and main bearings as well. It would be much easier for me to replace with a 2.2 if its just a drop in. Sorry for the story and thanks for any help.
lou
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Old 02-21-2006, 07:13 AM   #2
brighton96
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Chapter/Region: MAIC
Location: Fairmont WV
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I don't know if the swap would work or not, but i doubt you would get better milage by going down in displacement and power.

Just been my experience that the "economy" version of any car dosn't give good economy unless you drive it like one. As in slow speed, shift early, dont wind the rpms up, you can do that with any engine and get better milage. AWD will never help with mileage either.

I'd fix what you've got. I think you'd be better off in the long run.
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Old 02-21-2006, 12:15 PM   #3
Matt Monson
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It will work. Everything will bolt up exactly the way it used to. You will have 8.6:1 compression, and probably lose a fair bit of low end. All phase I Ej25's have rod knock. Many of the '95-00 Ej22's have it as well. Your two best bets are a 90-04 Legacy Ej22 bottom end or a '99-04 EJ25 bottom end. Going with the later will raise your CR for you and give you a little bump in power...
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Old 02-22-2006, 01:43 PM   #4
linsavy
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The mileage for the 2.2l is not a much better than the 2.5l. 1 or 2 mpg better. Not worth the loss in power. I'd go with the phase 2 block as Matt says and drive like a grandma. Always use cruise control on the highway, its good for about 10-15% improvement in mileage.
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Old 02-22-2006, 03:09 PM   #5
US2JDM
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Quote:
Originally Posted by linsavy
The mileage for the 2.2l is not a much better than the 2.5l. 1 or 2 mpg better. Not worth the loss in power. I'd go with the phase 2 block as Matt says and drive like a grandma. Always use cruise control on the highway, its good for about 10-15% improvement in mileage.
I'd agree with this. If anything, you'll probably end up flooring it even more in search of that extra power you're missing.
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