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Old 02-27-2006, 09:09 PM   #1
wagonovsky
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Default Run phase 1 dual port 2.2 heads on a phase 2 single port 2.2 block?

Currently I have a 1996 OBS 2.2L (Phase 2) heads. I was at the local junk yard recently and they had a legacy with Phase 1 2.2L (dual port exhaust). I was hoping that a cheap way for more HP would be to have these phase 1 heads ported & polished (or at least a 3 angle valve job), ship the cams off to delta for a mild re-grind then slap on some OBS 2.5 headers.

Will the phase 1 heads work on my phase 2 block if I use my phase 2 intake?
Am I crazy?

I know there are more traditional routes like:
- franken motor then use my existing 2.2 Heads (requires 2.5 short block)
- 2.5 swap (reqs wiring)
- WRX Swap (reqs a lot of wiring and other issues)

But I am on a budget and I'm looking for cheap solutions with minimal wiring.

Why not just use my existing 2.2l Phase 2 heads you may ask ... well, the junkyard heads are cheap and I need to keep down time of the car minimized. It would be nice to just get all of the head work done then swap them out one weekend. Also, there are no cheap equal length headers for the single port heads, but the OBX ones for the 2.5 are only $350.
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Old 02-28-2006, 09:34 AM   #2
Rally_wgn
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wow no love for the thread...
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Old 02-28-2006, 11:22 AM   #3
wrx_driver_2002
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The 2.5 Swap doesn't actually require any wiring... At least not for your car. If you went with a 1996-1999 DOHC 2.5, you could bolt your 2.2 Intake Manifold to it, and all of your wiring issues are handled by using the intake manifold that came stock with the car.

Is the motor that's in your car now the one that came with the car? They didn't switch to the phase 2 engine until MY1999. So unless the engine / heads have been changed, you've just got the phase 1 2.2 HLA heads that should have a single exhaust port on each head. 1996 was the first year for the single exhaust ports on the 2.2. Any Legacy 1990-1995 has Dual port 2.2 Heads which should be exactly the same heads as yours except will have dual exhaust ports instead of single.
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Old 02-28-2006, 02:54 PM   #4
shipjumper
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will the SOHC computer run the DOHC motor ok?
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Old 02-28-2006, 03:21 PM   #5
wrx_driver_2002
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Yes, it will run it just fine. The Cam and Crank triggers are the same.
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Old 02-28-2006, 03:54 PM   #6
shipjumper
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hmmm....

those DOHC motors are pretty easy to find...
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Old 02-28-2006, 06:54 PM   #7
yebokmj
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I have a MY97 2.5 DOHC with a phase II block that I'm selling with ecu. This will swap right into your MY96 without any wiring and the ecu will plug right in. I know this because I did it. Now I've swaped in a MY05 Legacy GT turbo which requires lots of wiring. PM me if your interested in the engine I need to get this out of the garage!
Joshua
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Old 02-28-2006, 07:09 PM   #8
Diz
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Quote:
Originally Posted by yebokmj
I have a MY97 2.5 DOHC with a phase II block that I'm selling with ecu. This will swap right into your MY96 without any wiring and the ecu will plug right in. I know this because I did it.
That's cool. I didn't realize the EJ22 manifold would bolt up to the EJ25 DOHC heads. Those heads mated to the phase II block are an awesome combo, especially if you can re-use the stock manifold. Keep in mind that you'll be running between 10.5:1 & 11:1, so stay away from cheap gas. Don't let that stop you. I got a ride in a car equipped with a similar motor. It's worth it.

I ran a phase I EJ25 shortblock with the EJ22 heads & delta cams. It was a good daily driver until I spun the #1 & #3 rod bearings.
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Old 02-28-2006, 07:13 PM   #9
yebokmj
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Your better off using the 2.5 manifold plus I'm pretty sure based on have had both engines that the manifolds are not compatable.
Joshua
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Old 02-28-2006, 08:07 PM   #10
wagonovsky
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Quote:
Originally Posted by wrx_driver_2002
The 2.5 Swap doesn't actually require any wiring... At least not for your car. If you went with a 1996-1999 DOHC 2.5, you could bolt your 2.2 Intake Manifold to it, and all of your wiring issues are handled by using the intake manifold that came stock with the car.

Is the motor that's in your car now the one that came with the car? They didn't switch to the phase 2 engine until MY1999. So unless the engine / heads have been changed, you've just got the phase 1 2.2 HLA heads that should have a single exhaust port on each head. 1996 was the first year for the single exhaust ports on the 2.2. Any Legacy 1990-1995 has Dual port 2.2 Heads which should be exactly the same heads as yours except will have dual exhaust ports instead of single.
You are correct, the current motor is a 1996 MY 2.2L with single port heads. Thats good news about the 2.5 not requiring any wiring! IS this true only for the DOHC 2.5? I like the idea of the frankenmotor, I'm just trying to save some cash.

Thanks for all the replies! I know 2 other guys who are interested in this swap, so we're trying to cover all possibilities.
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Old 02-28-2006, 09:15 PM   #11
AWDimprezaL
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right now im running a 1998 dohc 2.5 computer in my 1996 l 2.2, runs great, a little rich, higher redline, perminant CEL because of the lack of EGR...but whatever, i like the extra 500 rpm
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Old 03-01-2006, 09:50 AM   #12
shipjumper
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extra rich? you could probally get some extra air in there and reap the benefits! larger TB, intake, P&P
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Old 03-01-2006, 10:27 AM   #13
Matt Monson
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Quote:
Originally Posted by yebokmj
Your better off using the 2.5 manifold plus I'm pretty sure based on have had both engines that the manifolds are not compatable.
Joshua
That's what my information suggests as well. I have looked through the part numbers, and can't find an intake manifold gasket for any of the 2.2l variants that EVER used the inline bolt patter of the DOHC EJ25...
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