cporath Posted September 28, 2015 Share Posted September 28, 2015 I know this topic has been beat to death, but I can't seem to find the answer to my question. I have a 2004 Subaru outback with an ej251 that lost a rod bearing this weekend. I am tossing around the idea of swapping the 2.5 for a more reliable 2.2. I do understand that i need a phase 2 motor for a plug and play installation. My question is, what year and make of Subaru have the donor motor I would need. If I choose to stick with the 2.5, I understand that any 2.5 block from 2000-2005 will work? Is this correct? Thank you to anyone who can help! Link to comment Share on other sites More sharing options...
idosubaru Posted September 28, 2015 Share Posted September 28, 2015 Phase II EJ22 are only found in: 1999-2001 Impreza 1999 Legacy If it's not those - you don't need to ask. "Will a 1998..."....No. You also need a single port exhaust manifold for those as well. JDM suppliers have 2.0 stuff too that can work. Yes any 00-05 block will work. For that matter nearly any EJ block from 1990-2009 I think can work if you make appropriate decisions. I've used 1996-1999 DOHC blocks in your car but the pistons stick out and need to use thick headgaskets to compensate for valve interference. www.car-part.com Link to comment Share on other sites More sharing options...
cporath Posted September 28, 2015 Author Share Posted September 28, 2015 Thanks for the quick reply! I am really leaning toward the 2.2 as a replacement, and this information is exactly what i have been looking for. Link to comment Share on other sites More sharing options...
AdventureSubaru Posted September 28, 2015 Share Posted September 28, 2015 In these phase 2 motors the head gaskets were the same style. The EJ22 is NOT more reliable in the 1999 and up motors. The 90-98 2.2s were vastly more reliable than the troublesome 96-99 DOHC 2.5s. reliability of the phase 2 2.2s and 2.5s were the same and somewhere in between the earlier EJ motors. A 2.2 swap is fine if you source a cheap phase 2. Otherwise there is no advantage to having one. JDM Ej20 SOHC motors are a good option as they are cheap and still dual port while only sacrificing 10 HP. Or there are way more phase 2 2.5s out there than phase 2 2.2s. Explore all options, but don't hunt specifically for a 2.2. There's nothing in it for you. Link to comment Share on other sites More sharing options...
cporath Posted September 29, 2015 Author Share Posted September 29, 2015 I am honestly looking for a cheap option to get this thing back on the road. Having a couple of engine choices opens up alot more possibilities. I have already dumped a bunch of money into this car over the last year and a half already..... Thanks for all of the knowledge everybody! Link to comment Share on other sites More sharing options...
greenwagon04 Posted September 20, 2016 Share Posted September 20, 2016 good day all. I am wondering if anyone knows what it takes to put my 96-98 ej22 single port into my 2004 outback wagon. I have the ej22 full wire harness, y-pipe, tranny mount. everything i thought would might be needed to swap over. i would like to get away with using the existing 2004 wire harness and doing a little merging. has anyone done this before ? Link to comment Share on other sites More sharing options...
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