2.2 ej22 into a 98 Forester difficulty - Subaru Forester Owners Forum
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post #1 of 26 (permalink) Old 06-12-2010, 12:25 PM Thread Starter
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2.2 ej22 into a 98 Forester difficulty

So I just picked up a 98 Forester S with a blown ej25 DOHC.

I thought somewhere there was a writeup on which ej22 to look for and potential problems along the way.
I cant seem to find it though. A lot of that probably has do with search terms like 2.2 which most sites dont allow.

So if I want to put a 2.2 into my car which year should I look for?
I know that phase 1 ej22's have single exhaust port heads and phase 2 have dual.

But I'm concerned about wiring and compatibility other that the exhaust.

Anyone know which would be easier?

If I should be looking for a 2.5 SOHC let me know but I think more difficult than a 2.2 if I remember correctly.
I dont want to put just another ej25 DOHC in there either. So thats not an option.

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post #2 of 26 (permalink) Old 06-12-2010, 12:59 PM
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2.2SOHC to a 2.5L SOHC, easy and a direct swap for the most part if you you have a EJ22 with single port heads and the EJ25 SOHC style valve covers. Even then if one has other variations of the EJ22 things can be adapted cheaply.

Off the top of my head I can not think of a 2.2L NA that is DOHC(at least not state side).

Since you have a DOHC best advice to save a lot of headaches is to stay EJ25 DOHC. Going to SOHC would require you get the ECU for the SOHC, wiring harness and and merge both the wiring harness for your DOHC and the new SOHC into one to work with you chassis harness. There is no easy way to do it.

Why the dis-like for the DOHC?

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post #3 of 26 (permalink) Old 06-12-2010, 01:26 PM Thread Starter
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The ej22 is more plentiful and I would worry less about it's reliability.

I've found 2 ej22's just this weekend.
One of them with harness and ecu.
So yeah no dohc for me.

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post #4 of 26 (permalink) Old 06-12-2010, 01:55 PM
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In all honesty for a '98 it is a lot of work to go backwards, Yes the 2.2 can be made to work but why spend the extra time/funds and loose 30-40HP/TQ to do it?

If you had a '99+ SOHC I would say go for it but the added work/funds to convert from DOHC to SOHC negates any gain one may gain in reliability of the EJ22 in my opinion.

The easiest way to go about it is to use the EJ22 short block with your DOHC heads. But at that point just source a JDM EJ25 DOHC off ebay for $600-1200, swap intakes and be done with it. There are many EJ25D out there with 200K+ on them.

SUBARU LAGACY OUTBACK ENGINE EJ25 DOHC MOTOR 95-99: eBay Motors (item 260613466291 end time Jul-02-10 10:45:25 PDT)

JDM EJ25 DOHC 2.5L16 Valve 96-98 Impreza Legacy Outback: eBay Motors (item 380240041293 end time Jun-15-10 08:33:22 PDT)

JDM 96 97 98 99 Subaru 2.5L DOHC EJ25 Engine: eBay Motors (item 330439796101 end time Jun-13-10 10:38:52 PDT)

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post #5 of 26 (permalink) Old 06-12-2010, 03:52 PM Thread Starter
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I'm trying to keep it cheap at this point.
I've already got one FXT that is pretty quick so this Forester is just for my parents or maybe to sell.

I like the idea of using the EJ22 block but would the drop in compression make the car too underpowered?

I know the DOHC heads flow better so maybe that and a thinner head gasket thats than stock would negate the lower compression numbers?

There are those on this forum that have mated the EJ22 block and DOHC heads but I'll be damned if bookmarked the threads and I just cant seem to find them.

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Last edited by mavstang73; 06-12-2010 at 03:53 PM. Reason: grammar
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post #6 of 26 (permalink) Old 06-12-2010, 04:10 PM Thread Starter
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I think I might have the lower compression thing wrong.

I just read through some info on NASIOC that indicates the DOHC on a EJ22 block increases compression.

No...???

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post #7 of 26 (permalink) Old 06-12-2010, 05:13 PM
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yup, EJ22 with DOHC heads is a bump in CR. However it doesn't make up for the loss in displacement, you still loose a fair amount of power.

If you want to do it cheap, add up the cost of the EJ22 and the associated head work for the DOHC heads to bring them back up to par and then the gaskets and seals to assemble it VS. getting a JDM EJ25 DOHC and then swapping intakes.

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post #8 of 26 (permalink) Old 06-12-2010, 05:25 PM Thread Starter
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I should mention that I do have a set gaskets already from another failed project.

Ej22 is probably gonna be 200 with harness which I won't need.

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post #9 of 26 (permalink) Old 09-16-2010, 09:40 AM Thread Starter
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Completely forgot I started this thread.

The forester is alive and well with a ej22 under the hood.
It's plug and play with the exception of some vacuum hoses, single port exhaust manifold, different power steering pump and evap canister.

Runs great and will probably hit 250000 miles someday.
Might sell it... Might keep it. Haven't decided yet.

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post #10 of 26 (permalink) Old 07-04-2012, 07:38 PM
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Quote:
Originally Posted by flstffxe View Post
yup, EJ22 with DOHC heads is a bump in CR. However it doesn't make up for the loss in displacement, you still loose a fair amount of power.

If you want to do it cheap, add up the cost of the EJ22 and the associated head work for the DOHC heads to bring them back up to par and then the gaskets and seals to assemble it VS. getting a JDM EJ25 DOHC and then swapping intakes.
i've started the urge to do the 2.2 swap... is there any better reliability with the jdm ej25 with hg's vs the ej22 with the ej25 heads?
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post #11 of 26 (permalink) Old 07-07-2012, 09:46 PM Thread Starter
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So almost 2 years later the ej22 Forester is running strong.
Ended up selling it to my dad. He commutes about 40 miles a day to work.

Only issues so far have been a failed MAF sensor and TPS sensor. Just maintenance stuff otherwise. Did the timing belt in the spring along with all pulleys.
I love the ej22. Change the oil and it will run forever.

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post #12 of 26 (permalink) Old 08-14-2012, 09:27 AM
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So you went DOHC to SOHC and it was PNP? What about the wiring?

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post #13 of 26 (permalink) Old 08-14-2012, 09:45 AM
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There are MANY writeups on this over on USMB board. A member there, General Disorder, does these regularly in the garage he works at. IIRC, the 1995 2.2L Auto has an EGR and is a direct swap for most 1997-1999 DOHC 2.5L

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post #14 of 26 (permalink) Old 08-17-2012, 05:41 AM Thread Starter
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So you went DOHC to SOHC and it was PNP? What about the wiring?
Its all plug and play. No merging of harnesses no special wiring.
But this sort of thing is unique to the 98dohc->2.2L Phase 1 swap.

Source a 95-96 ej22 as ferret indicates.
Other years arent going to work as easily if at all. Personally I'd stick to a 96.

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post #15 of 26 (permalink) Old 10-17-2012, 09:19 PM
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Very interesting post, how did you end up finding the power mavstang? Is it really that bad? I bet since that 2.2 is tank, probably would be worth a couple performance mods to make up for it.
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