Which motor is better?

userm5898 · Post by **userm5898** » Wed Feb 13, 2008 1:56 am

Is a 2.5 DOHC better than a 2.5 SOHC and I've heard people say the 2.2 is better all together?

Post by **DLC** » Wed Feb 13, 2008 2:04 am

The Phase II SOHC is preferred to the Phase I DOHC. It's mostly due to reliability from the weak cylinder support in the DOHC models and their propensity to have headgasket problems.

The DOHC revs higher, but the SOHC has a much better torque curve and is easier to drive.

Some EJ22 models have problems also, but they're generally considered very strong engines.

userm5898 · Post by **userm5898** » Wed Feb 13, 2008 2:57 am

Thanks I have heard from others that the sohc produces a higher torque curve. and my 98 legacy 2.5L DOHC has head gasket problems so maybe ill swap a sohc phase II.

94TurboWagon · Post by **94TurboWagon** » Wed Feb 20, 2008 8:17 pm

Stick with a 2.2

94TurboWagon · Post by **94TurboWagon** » Wed Feb 20, 2008 8:18 pm

Isnt the EJ22T the best 2.2 engine ever

Post by **DLC** » Wed Feb 20, 2008 9:27 pm

The 22B engine is the "best" 2.2L factory engine Subaru produced.

The EJ22 in the North American Legacy is a very, very good engine...if you replace the heads and the pistons.

BXSS · Post by **BXSS** » Thu Feb 21, 2008 5:58 pm

DLC wrote:The 22B engine is the "best" 2.2L factory engine Subaru produced.

The EJ22 in the North American Legacy is a very, very good engine...if you replace the heads and the pistons.

I agree with you, but once you swap heads (+ intake), pistons (& rods) all that is left of the original motor is the crank & block...

Post by **DLC** » Fri Feb 22, 2008 12:04 am

...and?

If you're going to efficiently make over 300CHP you should have forged pistons. The stock rods are forged, but some lighter ones wouldn't be a bad idea. PnP the heads and intake manifold, or put on some WRX DOHC heads and you're breathing much, much better.

douglas vincent · Post by **douglas vincent** » Fri Feb 22, 2008 3:39 am

Mine.

Matt Monson · Post by **Matt Monson** » Fri Feb 22, 2008 4:32 am

userm5898 wrote:Thanks I have heard from others that the sohc produces a higher torque curve. and my 98 legacy 2.5L DOHC has head gasket problems so maybe ill swap a sohc phase II.

Not an easy conversion. Do your homework before you run out and buy a SOHC Ej25 for that car...

Post by **DLC** » Fri Feb 22, 2008 5:23 am

Do you have any Phase II SOHC motors lying around? I might need one.

Matt Monson · Post by **Matt Monson** » Fri Feb 22, 2008 2:34 pm

DLC wrote:Do you have any Phase II SOHC motors lying around? I might need one.

Again?

The only one I have is my built motor, and once I get the valve guide seals repaired, it's going in the wife's car. Sorry. I'll keep my ears open for one. PM me what kind of budget you are working with and more idea of what you are doing and I will see what I can do...

BXSS · Post by **BXSS** » Fri Feb 22, 2008 4:56 pm

DLC wrote:...and?

Once you change all of the internals + heads just about any motor can make good power, but I still think you are right & the ej22t has the most potential for a 2.2L !

A friend of mine has a '05 2.5l with a cracked piston - (AVO turbo Kit...) that he was going to get rid of once his car is swapped.
I could get details for you if you are interested.

Post by **DLC** » Fri Feb 22, 2008 5:44 pm

My engine is still working fine, but it's eating or leaking coolant again. Might be the HG once more, or maybe a pinhole leak in the radiator or...

I'd be looking for something I could plop in, more or less, over something that'd need the case cracked. Thanks though.

BXSS · Post by **BXSS** » Fri Feb 22, 2008 7:20 pm

I hear ya.

Good Luck!

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Which motor is better?

Which motor is better?