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ej22 engine with 2.5 heads???
Posted 27 July 2012 - 03:08 PM
Will there be an issue??
Posted 27 July 2012 - 06:10 PM
Even if it will work with the HG.... I'm not sure of the compression ratio. So you will have to do some research there. It will likely be a bit too low. The tendancy was toward larger combustion chambers in later years so you might end up with an engine great for turbo-charging but completely gutless on it's own.
Generally crossing the phase-I and phase-II boundary with blocks and heads is not done. There are some exceptions but all of them involve smaller heads on larger blocks.
You may be able to use phase-II 2.2 heads. Those would be a better fit and would mate up to your manifold.
Posted 27 July 2012 - 06:33 PM
I have installed Phase I EJ25 blocks in Phase II EJ25 vehicles. Pistons will strike the heads if you don't use a thick headgasket.
So if a Phase I EJ25 block can be installed in a Phase II EJ25 vehicle and your EJ22 heads will bolt up to a Phase I EJ25...there is hope.
Posted 27 July 2012 - 06:42 PM
Posted 27 July 2012 - 07:45 PM
Only reason why im.asking is because the shop said ghe 2.2 heads have low volume. And two of the valves have a little rust around the rim.
So i have a set of the 2.5 off my other motor.
Im new to the subaru game. I've always had mustangs. So please understand why im lost.
I'll take suby 101 please. LoL.
Posted 27 July 2012 - 08:19 PM
'96 2.2 is not the engine you need for that car. Nothing about that combo is going to work well.
You need a '99 to '01 2.2
Posted 27 July 2012 - 08:37 PM
Thats why i got this yr/style.
Now im lost. LoL.
Posted 28 July 2012 - 08:26 AM
that thread you linked to says nothing about later model 01 vehicles. 96-01 is nowhere to be found.
On one of the post on here stated, That getting a replacement from yrs 96-01.
but if you do find such a statement you can disregard that completely - that is not even close to true or of any value to you at all.
the EJ22 changed completely in 1999 and is not interchangeable with earlier EJ22's. the EJ25 also changed in 99 or 00 (depends on vehicle) and is also not interchangeable with earlier EJ25's.
now by "not interchange" i mean plug and play swap....but if you're talking swapping heads, blocks, etc it starts to get far more complicated because of all the changes and i don't have time to write a book.
as GD said the intake manifolds change in 99 so it's not a simple swap when yo'ure talking about swapping heads.
you can work around it but for an easy swap you want to keep the heads with the vehicle.
which is what you're asking i think - keep the 00 heads on the car and bolt them to the EJ22.
Posted 28 July 2012 - 12:57 PM
Can this work.?
Sorry i didnt explain myself before.
And disregarding the other info.
Posted 29 July 2012 - 06:20 PM
But that would be the only "no way" problem.
If the valves fit within the firering of the 2.2 headgasket, then you could do it.
It may have a low compresion ratio, but otherwise I would guess it would run pretty well.
No clue about horsepower:popcorn:
Posted 30 July 2012 - 03:22 AM
Seems either way im going to have low compression. Machine shop said the 2.2 heads have slightly low compression.
But anyway here is the Clean 2.2 head & 2.5 http:// http://m.flickr.com/...x?id=7675216154
Posted 31 July 2012 - 09:14 AM
You should find another EJ25. The EJ22 in that car with low compression heads is going to be scary to drive.
Posted 31 July 2012 - 10:01 AM
Posted 01 August 2012 - 10:19 AM
i put a 91 2.2 in a 2003 impreza other day just the short block and used the 2.5 shoc heads and intake had to use 2.2 turbo gaskets and slightly modify them and the timing belt was a little tight had to trim the adjuster a slight bitt ran very good and still running no problems dident even notice any power diferance and the girl saved over 2000$ on the job 2.2 bottom end 500 $ 2.5 bottom end 2500$ and the 2.2 bottom end is way stronger
Thank you. I will try to find thinner gaskets to raise compression, i was afraid that the 2.5 were slightly off. So i am going to have to put them close up to the block to make sure all ports line up. Correct.?
Anything else i should know?
and which year of 2.5 sohc heads did u use?
Posted 01 August 2012 - 12:34 PM
Ivan is saying he used 2.2 Turbo head gaskets which are composite not MLS style gaskets. They would be much thicker resulting in even less compression. But they would be easier to trim for the cooling ports being graphite composite gaskets.
The gasket thickness will space out the heads farther than normal - resulting in the timing belts being tight. So it makes sense he had to modify the belt tensioner.
He stated the year - 2003 Impreza. Which would be an EJ251 - so that's the heads he used.
Seems like a lot of work but if Ivan says is works then I would be inclined to believe it. Though an Imp is going to weight a lot less than a Legacy GT so the decrease in performance would be less noticeable.
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