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EJ22T + 2.5 SOHC heads..(simple/short/not stupid questions)


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7 replies to this topic

#1 Jutboy

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Posted 08 April 2007 - 10:45 AM

Hey there all, I've been looking around forum for no joke 20'ish hours and I really just need to ask a couple of small questions...

I was thinking about getting an 2.5 SOHC head/intake set for my EJ22T 91 Legacy.

My questions are.....

1)The oil/coolant issue...

So for the coolant you just bypass the block+head and just tap into the lines appropiately.

The oil you just use a plug on the top towards the back.
Just that simple or I'm missing something?

2)Low compression......

Are numbers in the low 7's ok? Can I switch to a thinner head gasket to bump it up a bit (I figure theres more clearance then the DOHC)

3)Up-pipe issue....

I'm leaning towards grinding a small part of my heads because it seems a lot easier then fabing up the up-pipe....why not?

4)Phase I and Phase II...

whats the difference? Will it matter to me?

5)Other problems I don't know about...I'm going to have to mount an intercooler somewhere...not sure where? Anything else....

Thanks so much - Jutboy

PS> Feel free to instant message me!

#2 mikeshoup

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Posted 08 April 2007 - 11:03 AM

I thought EJ22Ts were already SOHC?

#3 Jutboy

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Posted 08 April 2007 - 11:07 AM

your right....I mean the 2.5 heads

#4 Jutboy

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Posted 08 April 2007 - 11:14 AM

I just was told that I have a feed line for oil in my block (no one would have a pic would they???) and then I need to weld a return line into my oil pan....sounds good....coolant is just tapping in existing lines.

Sounds right?

#5 86BRATMAN

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Posted 08 April 2007 - 11:58 AM

This is usually done with dohc ej25 heads. And there shouldn't be any issue with the uppipe or downpipe that I'm aware of.

Its been gone over in detail on www.legacycentral.org as well.

#6 Storm

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Posted 09 April 2007 - 05:00 PM

From my reading...there is a clearance issue using an OEM up pipe with EJ25 SOHC heads. No issue with DOHC heads...but if you have them (SOHC) already, no sense in buying more parts. Do the clearancing you need and go.

The low compression is going to mean slow spooling. That's pretty low, even for a turbo motor....A thinner HG isn't going to bring it up by much and decking the heads plus the thing gasket might bring you more problems with cam timing than the compression will help.

I can't be absolutely sure on the oil tapping point on the block but I know of others who have Tee'd off the pressure sender or used another port on the other end of the block. A simple drainback into the pan is sufficient although I can't believe people try and sell banjo bolts to double as a return line/oil drain plug....

Any particular reason why you want to go with the EJ25 heads on the EJ22 block?

Jay Storm

#7 Jutboy

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Posted 09 April 2007 - 05:39 PM

They flow really well...lets you take advantage of a bigger turbo.

#8 Storm

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Posted 09 April 2007 - 10:06 PM

They flow really well...lets you take advantage of a bigger turbo.

The replies you've gotten over on nasioc describe what I have also learned. Personally, I think the better option would be WRX heads on the EJ22T block or new pistons. With such low compression and a huge turbo, you'll be needing to stay in boost much more often for a daily driver.

Just my opinion though...YMMV.

Jay Storm




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