I have a question about putting together an engine out of stuff i have around.

[97gtguy]

Ok well first off i wanna start by saying good afternoon everyone and here is my question: My car is a 1.8l so if i used the phase 1 2.5l block will it work (keeping it n/a of course) and if so will it be street driveable ? I know its probably a stupid question but im still getting used to subaru's and thats the only reason why i asked.

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[GrimmSpeed]

Yeah it will definitely work! You can swap in just about any newer subaru motor and it will bolt up no problem! You'll likely have to do some custom wiring and other misc things but fitment and reliability are as good as you make it!

Mike

[renob123]

Originally Posted by 97gtguy

Ok well first off i wanna start by saying good afternoon everyone and here is my question: My car is a 1.8l so if i used the phase 1 2.5l block will it work (keeping it n/a of course) and if so will it be street driveable ? I know its probably a stupid question but im still getting used to subaru's and thats the only reason why i asked.

I like the thread title If I understand correctly, you're a good candidate for a high compression Frankenstein motor using your 1.8 heads on the 2.5 block. Search for the big-ass thread about it and see if it's right for you.

Jacob

[Storm]

I've done this.....not with the EJ18 heads, but with an EJ25D longblock mated with an old EJ20G manifold running on the stock EJ18 ECU.

Your compression ratio will be pretty high, but drivable on pump gas. Search for the "hi-compression frankenstein" thread and you'll get a ton of great info to answer any questions you might have.

Have fun!
Jay

[renob123]

Originally Posted by Storm

I've done this.....not with the EJ18 heads, but with an EJ25D longblock mated with an old EJ20G manifold running on the stock EJ18 ECU.

Your compression ratio will be pretty high, but drivable on pump gas. Search for the "hi-compression frankenstein" thread and you'll get a ton of great info to answer any questions you might have.

Have fun!
Jay

How high of compression? I'm doing the same thing with EJ22 heads and Delta cams, and you're making me worried.

Jacob

[97gtguy]

ok so im thinking 2.2 heads phase 1 from an earlier legacy on a 2.5l phase 1 block with the 2.2 intake and all that stuff but what power numbers am i looking at n/a all stock just the 2.2 heads on the 2.5 block ?

[renob123]

Originally Posted by 97gtguy

ok so im thinking 2.2 heads phase 1 from an earlier legacy on a 2.5l phase 1 block with the 2.2 intake and all that stuff but what power numbers am i looking at n/a all stock just the 2.2 heads on the 2.5 block ?

Do you have the 2.2 heads and intake lying around as well? I'm not sure if you'll see any gains over using the 1.8 heads. I'm interested in seeing one of the experts chime in on this

Jacob

[97gtguy]

well i have the 2.2 in the car and just had it freshened up which is why i suggested the 2.2 stuff vs the 1.8 stuff id have to get freshened up.

[Storm]

The experts have chimed in.......years ago.

In the hi-compression frankenstein thread......

Cliffnotes: EJ18 heads on a EJ25 bottom end will give you about 11.5:1 CR. Still runnable on pump gas, premium maybe....but nothing wild. Power level? not sure but likely in the mid 140's.

EJ22 heads on a EJ25 bottom end will give you about 11.1:1 CR. Power level has been posted around 150-155. I may be off on the numbers, it's been years since I read the thread.

Jay

[renob123]

Originally Posted by Storm

The experts have chimed in.......years ago.

In the hi-compression frankenstein thread......

Cliffnotes: EJ18 heads on a EJ25 bottom end will give you about 11.5:1 CR. Still runnable on pump gas, premium maybe....but nothing wild. Power level? not sure but likely in the mid 140's.

EJ22 heads on a EJ25 bottom end will give you about 11.1:1 CR. Power level has been posted around 150-155. I may be off on the numbers, it's been years since I read the thread.

Jay

Hey sorry Jay. It's been a couple days since I read the thread, but there was so much information in there that I obviously didn't retain very much of it. I seem to remember that the Phase I/Phase II components would affect the numbers you posted, but I'll do the right thing and search

97gtguy: It looks like you got what you wanted, so good luck with the build

Jacob

[97gtguy]

yes sir thank you guys for your help and hopefully soon ill be reporting with good news as the car is being delivered to me and will be here in about 10-15 minutes.