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Old 10-31-2012, 12:47 PM   #26
69subaru360
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1998 2.5 RS

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Quote:
Originally Posted by 97ej22e View Post
I've been in the process of building what some of you are talking about. I have an ej22e short block and I am putting on ej25d heads and ej22t pistons. Best part about the dohc heads (as mentioned above) is that they have an oil feed for the turbo, and you can drill into them for the coolant (either the return or supply I am not sure) and the oil return. I talked to a master mechanic about the compression ratio and he said if I am near 7.5:1 compression ratio it will be safe to run a good amount of boost. I could care less about off the line power. I don't plan on launching my car or trying to race from a dead stop, don't feel like replacing my transmission.
Don't use the 22T pistons with those heads. They have larger chambers and you'll have ridiculously low compression.
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Old 11-02-2012, 01:21 AM   #27
that11guy
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1998 Legacy
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Instead of drilling the heads for oil you can use a T fitting off of the oil light switch on top of the engine.
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Old 11-02-2012, 10:57 AM   #28
97ej22e
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Originally Posted by 69subaru360 View Post
Don't use the 22T pistons with those heads. They have larger chambers and you'll have ridiculously low compression.
So whats your point? STI's come stock at 8.0:1 I'll be at 7.8:1 which isn't bad and much less likely to wind up bending or breaking rods. I'm not someone who races so the loss of bottom end power I could care less about.
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Old 11-08-2012, 02:02 AM   #29
i_c_the_light
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Just thread jacking. But I have a phase II EJ22 and EJ20H heads. How would my CR be using phase EJ22T head gaskets?
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Old 11-14-2012, 12:59 PM   #30
RedGauge
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I have seen (in person) the layouts of many different blocks. They are basically the same. You buy headgaskets for the heads! Look at all the tiny ports on a head. Look at the possibilities for the block. Its like 2 oil passages and the rest are water. If you bought it for the block there would be only a few different HG's. One hg for the ej22 one for the ej25.. etc...
Thats my seemingly logical opinion based on experience and examining the head differences between phase 1 ej22's, phase 1 ej20's, ej25d, and a phase 2 ej22.

I have had stock phase 2 pistons in my phase 2 ej22e. Then I rebuilt it with ej22t pistons. I could not feel any difference between the two compression ratios. Im sure if you were na you would. But once you go turbo to na... slow is slow..! Higher compression is always best for more power, but thats when you need to buy forged. Reliably low compression ej22t pistons are a good cheap choice. I was very pleased.
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