Phase 2 EJ22 turbo question

[98legacygt22]

Considering adding a VF39 to the 98 outback I just bought. Can anyone chime in on what the compression ratio would be with the below setup?? I've been told over 10:1 but for some odd reason I think it would be lower than that.
My idea

1999 Phase 2 EJ22 short block
1998 Phase 1 EJ25D heads
Stock thickness head gaskets

[mike-tracy]

Using this matrix:

http://forums.nasioc.com/forums/showthr ... ?t=1787730 (http://forums.nasioc.com/forums/showthread.php?t=1787730)

It shows 9.2:1 CR for your combo, but with a 1.5mm gasket. What is the stock gasket thickness? You can extrapolate that the end result would be >9.2:1. Also the footnote matrix indicates not using the "recommended gasket" aka 1.5mm, would lead to detonation and wrong squish.

[86bratman]

Marnix's chart you have referenced there doesn't have info for the ej222 phase 2 engine, only the ej22e phase 1.

[mike-tracy]

Marnix's chart you have referenced there doesn't have info for the ej222 phase 2 engine, only the ej22e phase 1.

Good catch. Then he would be even higher CR, probably close to 10:1!

[EJ22D]

The 25D head/222 block combo with 222 head gaskets is 10:1 with gaskets that have stock thickness. I have built this before. You're going to have to change the pistons & cut deeper chambers into the heads if you want lower compression.

[86bratman]

Should be slightly higher than 10:1, more like 10.3:1 because the ej25d heads are a 46.9cc combustion chamber and ej222 is 49-50cc. And ej222 has 10:1 stock.

[98legacygt22]

Thanks guys! Ill probably just leave it n/a and buy a turbo short block someday. Should be pretty peppy with a 10.3:1 CR and dohc.

Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

[EJ22D]

Thanks guys! Ill probably just leave it n/a and buy a turbo short block someday. Should be pretty peppy with a 10.3:1 CR and dohc.

Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

You will find that engine with more power than a regular EJ22 (my current DOHC EJ22 is a little more powerful & it has 9.5:1 compression) & VERY eager to rev. In fact, you will likely drive fast because it WILL be fun & it is what that particular kind of engine is suited for. The DOHC heads are perfect for the revs. They maintain power & drop off right at redline, so that engine will never be starved for midrange. You will lose TQ though due to the 30% displacement reduction a good intake, ignition, & exhaust setup will make up for some of that along with ignition upgrades. Also, make sure your fuel filter is a clean one. This is VERY important.

[Reuben]

What cars did these EJ222's come on? it's not something we got over here... I'm very curious!

[86bratman]

99 legacy non-gt, and 99-01 imprezaa non-rs is all that got the ej222, not an incredibly common engine.

[98legacygt22]

I'm thinking about swapping to a phase 1 short block, or adding legacy turbo pistons to this block. Dont want to have too high of a compression ratio and blow it up easily. I know at 5psi it would be safe but who wants to run only 5psi?

[Reuben]

8.5:1 and 20psi is good fun, I suggest trying it :P