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Old 10-04-2010, 01:45 PM   #1
subarumafia700
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Default 2.2t heads on 2.5l block

hey guys im thinking of putting together a new engine before this winter as my current engine is lacking a little compression, and is knocking something terrible.. i hear that the 2.2 head 2.5 block combo bumps up compression and is still really relyable.

my question is what head gasket should i use?
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Old 10-04-2010, 06:22 PM   #2
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Quote:
Originally Posted by subarumafia700 View Post
hey guys im thinking of putting together a new engine before this winter as my current engine is lacking a little compression, and is knocking something terrible.. i hear that the 2.2 head 2.5 block combo bumps up compression and is still really relyable.

my question is what head gasket should i use?
You should use the gasket that would go with the block you're using. I'd get new ones from the dealer, since they have revised the head gasket design a couple times.

Have you read the High Compression Frankenstein thread? If not, you should. You may find that the EJ22T heads are not the best for you. I'm not sure they'd be the best for any setup, honestly.

Jacob
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Old 10-04-2010, 07:52 PM   #3
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cometic makes a headgasket for the na ej22e heads with a 2.5l bore just for the frankenmotors (i've got a set )
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Old 10-04-2010, 10:56 PM   #4
subarumafia700
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cometic makes a headgasket for the na ej22e heads with a 2.5l bore just for the frankenmotors (i've got a set )
have you now?
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Old 10-04-2010, 11:29 PM   #5
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so i just read the frankinstein thread. and thats kinda what im looking at doing. Only, i have read that using a smaller displacement block with hight displacement heads will drop compression ratio..thus why the ej22t block with the ej25d heads is a popular combo for a low compression turbo build. there is actually a guy with this combo out there thats making like 450whp with this setup, and pushing like 30psi.

My understanding has always been bigger bore smaller head. A local shop used a 2.2l block with 1.8l heads and i think a 2.5l intake manifold and made like 12.5 or 13:1cr

So i kinda wanted to go the same rt only with a bigger block.
Ive read that the ej22t heads only flow a little less then the wrx heads, and they are dual port which is nicer over the single ej22e.

I have what i believe is a set of perfectly fine ej22t heads with low milage, and i need to find an ej25 block that needs like rings maybe. I dont wanna have to go internal if at all possible, other then like rings, thats cut and dry and cheap.

Let me know what you think, im probley going to give this a shot, i dont really have much to loose, i have plenty of time on my hands out here at school, and just about anything would be better then the engine currently getting abused
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Old 10-05-2010, 11:01 AM   #6
subarumafia700
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anyone have any input at all? Am i totally mistaken here? Is there something maybe im over looking?
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Old 10-05-2010, 11:22 AM   #7
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are you talking EJ22t SOHC or DOHC heads? The SOHC heads are crap with very small valves....a NA SOHC head has better valves

http://forums.nasioc.com/forums/show...light=crap+box
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Old 10-05-2010, 11:40 AM   #8
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Originally Posted by subarumafia700 View Post
anyone have any input at all? Am i totally mistaken here? Is there something maybe im over looking?
I hear NABISCO's heaviest activity is during the day. You may not get a lot of responses at night. It doesn't mean that nobody will ever respond

As to your questions, it looks like in one post you want to use 22T heads on a 2.5 block. In another post, it's 2.5 heads on a 22T block. Either that, or you totally misunderstood the Frankenstein thread, and you should go back an reread all of it.

Jacob
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Old 10-05-2010, 04:11 PM   #9
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I will reread it, but to clear what i had said before

I have read a thread both here and on bbslegacy.com that you can make a very nice hybrid low compression engine using a smaller block and bigger heads.

So i would like to do the opposite and use the bigger block and smaller heads to get high compression without having to get pistons.
I know of an impreza in VT that has (if i remember correctly) a 2.2l block with 1.8l heads and a 2.5l intake manifold and they are getting close to 13:1CR.

So, i am planning to do the same only with a 2.5l block and 2.2 heads.
Hope this makes sense.
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Old 10-05-2010, 04:25 PM   #10
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Quote:
Originally Posted by subarumafia700 View Post
I will reread it, but to clear what i had said before

I have read a thread both here and on bbslegacy.com that you can make a very nice hybrid low compression engine using a smaller block and bigger heads.

So i would like to do the opposite and use the bigger block and smaller heads to get high compression without having to get pistons.
I know of an impreza in VT that has (if i remember correctly) a 2.2l block with 1.8l heads and a 2.5l intake manifold and they are getting close to 13:1CR.

So, i am planning to do the same only with a 2.5l block and 2.2 heads.
Hope this makes sense.
Ok, as long as you promise to read all of the pages of that thread...Yes, you can put 2.2 heads on a 2.5 block to get more displacement and a higher compression ratio. The Frankenstein thread is filled with people who have done that same thing, including me. The Delta cams I threw in at the time helped make that motor pretty impressive, considering how little work/money goes into it.

My setup (phase I block, phase I heads) yields 10.8:1 compression, from what I understand. I do not know of a way to get the compression ratio you mentioned without custom pistons, but then, I'm not sure why you would want it that high anyway.

People will probably caution you against using the EJ22T heads because they don't flow very well. Also, the Frankenstein motor make sense pretty much only for someone who has a 1.8 or 2.2 motor in the car already. My 2.2 blew a ring or something, so I put in a 2.5 block and reaped the benefits.

Jacob
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Old 10-05-2010, 04:36 PM   #11
dangerousatom
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Old 10-06-2010, 01:25 AM   #12
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the na ej22 heads have bigger valves, add a set of delta cams in there and they should flow ok, still nowhere near the sohc heads but much better than what the ej22t heads should flow
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Old 10-06-2010, 06:11 PM   #13
subarumafia700
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cool thanks for the help
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Old 10-07-2010, 05:57 PM   #14
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good info
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Old 10-17-2010, 06:56 PM   #15
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Lightbulb ej22 singel port on ej25 block

so im not trying to take over this post but wanted to know if i can put ej22 single exhaust heads on an ej25 block and with block would work the best
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Old 10-17-2010, 11:17 PM   #16
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Yes ...but why?

Depending on the year and motor the ej25 SOHC heads are almost always better than the ej22.
If this is a matter of keeping the stock header for the single port heads then your better off getting a new header to go with the better ej25 heads.
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Old 10-04-2011, 08:22 PM   #17
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Sorry to bump this old thread, but I have a question about EJ255 SB + EJ22 SOHC heads.

What are you guys running for EM? How do you tune these engines?

Thanks!
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Old 10-04-2011, 11:57 PM   #18
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No tune needed if you use this in an EJ22 car, direct bolt in affair. Of course if you could tune it you could gain more.


~Josh~
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Old 10-06-2011, 04:02 PM   #19
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Old 10-07-2011, 11:15 PM   #20
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Quote:
Originally Posted by ballitch View Post
No tune needed if you use this in an EJ22 car, direct bolt in affair. Of course if you could tune it you could gain more.


~Josh~
Thanks for the info, Josh.
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