will 98 2.2 single ports bolt onto a 02 wrx block?

[rufracer]

If so, would this be a good setup for a turbo?

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[jey]

It'll bolt on, but you will have almost no options for an up-pipe/header that will bolt on to the single-ports. You'll have to get something fabricated - and I think someone on these forums is working on that.

[rufracer]

that no biggie, Iwork in a machine shop and am friends with a welder. Can I use my 2.2 cams too?

[kheff46]

use your 2.2 cams, they work fine. your CR will be low enough to actually push boost into your frankenbuild.

--keith

[midnight2.5rs-t]

hit up ebay i found single port headers and uppipe on there last night.

[PhilSine]

With EJ22 heads and a WRX block and head gaskets, your CR should be around 9.5:1. Using EJ22 head gaskets will lower your CR to close to 8.8:1.

[ballitch]

Match your head gaskets to your block... Ebay usually has a couple different sizes for that block.


You can use your stock cams, but you could swap them out for aftermarket ones. While you have the motor out.



~Josh~

[Impaled]

How much worse are the 2.2 heads compared to wrx heads?

[96SubyImpreza]

I'm assuming they are the single port single cam heads??? I have them on my EJ22 n/a right now.... they seem to work fine but I doubt that they flow that well..... port seems a bit small. I didn't port the exhaust or anything but I'm sure theres some room for improvement.....

I've heard that they will give you more mid range power versus the DOHCs, but possibly fall a little short up top.

[96SubyImpreza]

Now that I look at that again I'm sorry.. that didnt really answer your question at all. I'm sorry :-\

Not sure.

[Chi_San]

SOHC heads don't flow as well as the DOHC heads. Do yourself a favor, grab some 2.5 NA DOHC heads and put them on an EJ255 or EJ257 block. You'll run boost, and have a good CR for really quick spool.

[silentt]

Originally Posted by Chi_San

SOHC heads don't flow as well as the DOHC heads. Do yourself a favor, grab some 2.5 NA DOHC heads and put them on an EJ255 or EJ257 block. You'll run boost, and have a good CR for really quick spool.

Tell that to COBB...
http://forums.nasioc.com/forums/show...ighlight=ej22t

SOHC has better exhaust flow, not as good intake flow. They are about the same and SOHC is cheaper to upgrade cams and easier to replace timing belts.

[Chi_San]

Yeah, the DOHC heads have better intake ports.

After owning a car with SOHC and DOHC heads (2000 BE sedan and a 1998 GT Wagon), I'd go with DOHC heads. The power band is a bit more broad, and you get your torque peak lower.

[rufracer]

Im trying to go cheap, and use what Ive got. If I were going to buy a new block, and heads then I would just do a jdm swap. Im a tight wad, thanks for the input though.

[rufracer]

How does the original 2.2 block compare to the wrx 2.0 block as far as boost is concerned anyway?

[MY99 2.5GT]

If you look at COBB's test you will see that they are not measuring the static flow of the bare head. They are measuring a fully assembled stock head with stock cams. The stock SOHC cams have more slightly more intake lift and a lot more exhaust lift then the stock DOHC Cams. If your planning to do an all out race motor or higher horsepower street motor like mine where you will be swapping cams and springs I wouldn't go with anything but the DOHC.

However the best bang for your buck for a fully assembled head set for turbo application would be the WRX heads. The 04+ heads have shimless buckets. So if you buy a newer set make sure they come fully assembled. Otherwise a valve adjustment could cost you a fortune.

The SOHC EJ25 has a larger head volume then the DOHC (SOHC-46.6cc/DOHC-50cc). Using the SOHC heads over the DOHC heads will lower your compression ratio a little more. Upgrading Cams would definitely be cheaper for the SOHC heads.

I'm just not totally confident in using the SOHC heads in combination with high lift cams or stiff springs in a high boost application. I just don't know about the reliability of those rockers.

[IllNastyImpreza]

Everything I have checked out in the past states that the DOHC heads do have larger ports, and have a little greater potential.... BUT they are ZERO clearance heads, and leave alot less piston options as well. Plus, you have 2 more cams which equals more money for cams.....though I do believe the JDM sti v2 cams are a direct swap...

If I didn't need to keep my stock heads in order to pass emissions, I would be ALL over swappin out the DOHC

[ballitch]

MY 99 2.5GT, those head volumes are backwards, the sohc EJ25 has 50cc head volume, the dohc has the 46.6cc.


The wrx block was a turbo block from the factory, so I'd guess it can handle some boost. If you wanted to go really cheap you could just throw your heads on an EJ18. Best part is, if you blow it up, you're not out a lot of money. This is, of course, not a good idea if you already have the wrx block.


Or you could find a set of SOHC EJ25 heads and throw them on your EJ22 block.


Also, fill out your profile so we can all see what car you have.


~Josh~