EJ22t w/ Phase I 2.5 DOHC Heads (PICS)

MY99 2.5GT · Post by **MY99 2.5GT** » Tue May 16, 2006 6:51 pm

If you can get a manifold with it thats all the better. I was just saying a cleaned up or newer set of 2.5 DOHC heads shouldn't run you more then $250. At least I wouldn't pay more then that.

There are people asking $400 + for WRX heads but thats a little more understandable.

brad

Matt Monson · Post by **Matt Monson** » Tue May 16, 2006 7:21 pm

Here in Colorado, good used DOHC Ej25 heads go for $300 a pair, and generally without manifold or injectors. Figure another $100 for those parts. Anything cheaper than that is a bonus...

napphappy · Post by **napphappy** » Tue May 16, 2006 8:57 pm

Project_Legacy wrote:how has this been going napphappy? i believe i will be going this route for my ej22t i have in my garage.

Everything with the engine has been great.
Although ive had to replace the starter, center diff, radiator ect... now I hear an axle going

Oh well Im just glad the engine runs, and its really fun to drive. Very smooth power.

napphappy · Post by **napphappy** » Tue May 16, 2006 9:16 pm

Added another pic, Engine in car

greg donovan · Post by **greg donovan** » Tue May 16, 2006 9:34 pm

how did you fasten the metal WRX coolant expansion tank in the bay in that location?

napphappy · Post by **napphappy** » Tue May 16, 2006 9:36 pm

Right now its not so much fastened as it is resting.

greg donovan · Post by **greg donovan** » Tue May 16, 2006 9:45 pm

napphappy wrote:Right now its not so much fastened as it is resting.

what are your plans?

do you think it is possible to fasten a bracket to it of somesort off of the IC?

napphappy · Post by **napphappy** » Tue May 16, 2006 9:48 pm

I haven't really had a chance to figure it out yet. Sorry.
Almost anything is possible though.

Project_Legacy · Post by **Project_Legacy** » Tue May 16, 2006 10:45 pm

hmm. i WAS going to pick up some heads like these today, but instead... i got a killer deal on some ej20g heads! infact, it even comes with a block!

no intake mani though... so that means im gonna be searchin for a lil while.

gt2.5turbo · Post by **gt2.5turbo** » Wed May 17, 2006 12:37 am

http://bbs.legacycentral.org/viewtopic. ... highlight=

there you go

Project_Legacy · Post by **Project_Legacy** » Wed May 17, 2006 4:39 am

yea i replied to him. lol. thread is a lil old though.

tris91ricer · Post by **tris91ricer** » Wed May 17, 2006 4:54 am

Don, I'd say since we have the same build that going to some ej20k heads would be great, and we could still use our current intake manifolds. Although, the idea of using some sr20det injectors makes me giggle a little bit.

But, I also have plans for a 22t block, and I might be interested in trying the 2.5 heads, just to see what its like.

Project_Legacy · Post by **Project_Legacy** » Wed May 17, 2006 5:55 am

ej20k heads would be great, i dont know about the costs though. if i can make some nice power with the 2.5 heads and 2.2 block, that would be great. i dont even have an ej20g manifold right now. lol. i heard that the 2.5 DOHC intake mani might fit, i havent confirmed it yet though.

tris91ricer · Post by **tris91ricer** » Wed May 17, 2006 8:35 am

I have pics of the different manifolds in my gmail. Pm me and I'll find 'em for you. When Eric and I put together my motor, I documented the process, and took some pictures of the motor internals.

azn2nr · Post by **azn2nr** » Thu Nov 16, 2006 11:32 pm

read thorugh but didnt see

whats the final compression ratio??

tmarcel · Post by **tmarcel** » Fri Nov 17, 2006 12:49 am

Nice job thread starter. I had some NA Phase 1 heads down at the machine shop which were waiting to be tapped for the oil drain and coolant hose. I sold them instead after measuring the cam lobes. I had already spent a bunch of time porting them but the availability of aftermarket cam costs were unrealistic.

Anyhow, I'm not sad to see them go by any means. I'm curious why some of you think that the NA 2.5 heads flow "as good as" or "better than WRX/EJ205 heads"??? I've had both, and ported both, and if anything the WRX ones look better to boot. Do you guys have some flow bench numbers or something? If not then that myth should be put to rest. Plus, the WRX cams flow much better

tzedek · Post by **tzedek** » Sun Nov 26, 2006 5:38 pm

This thread should be longer than 2 pages for such a thing like this

anyway I had a couple of questions, hopefully it hasnt been too long to remember. What did you have to do to use the 2.5 manifold ? Did you use the 2.5 engine harness too, or modified 2.2? and also does anyone know if you could use wrx cams in the 2.5 heads? Thanks, im thinking about using some of these heads myself.

tmarcel · Post by **tmarcel** » Mon Nov 27, 2006 2:52 am

tzedek wrote: and also does anyone know if you could use wrx cams in the 2.5 heads?

EJ205 and newer cams won't fit. The WRX cams are larger diameter.

555BCTurbo · Post by **555BCTurbo** » Mon Nov 27, 2006 5:23 am

tmarcel wrote:Nice job thread starter. I had some NA Phase 1 heads down at the machine shop which were waiting to be tapped for the oil drain and coolant hose. I sold them instead after measuring the cam lobes. I had already spent a bunch of time porting them but the availability of aftermarket cam costs were unrealistic.

Anyhow, I'm not sad to see them go by any means. I'm curious why some of you think that the NA 2.5 heads flow "as good as" or "better than WRX/EJ205 heads"??? I've had both, and ported both, and if anything the WRX ones look better to boot. Do you guys have some flow bench numbers or something? If not then that myth should be put to rest. Plus, the WRX cams flow much better

Man it's great when noobs come on here and start running their mouths without even searching or doing their research...I believe one of the senior members did a comparison of the heads to arrive at such results...and most likely posted the info!

I don't recall the WRX heads and the Phase I 2.5 heads looking any different either...

FuJi K · Post by **FuJi K** » Tue Dec 12, 2006 5:00 pm

Here's the MYTH!

Here we have USDM EJ205 vs the '97-'99 USDM NA DOHC 2.5L head
The PORT ENTRY of the WRX are bigger, but the PORT RUNNERS are rounder and smaller than the NA DOHC 2.5L head. The NA 2.5L SOHC PORT RUNNERS are smoother and has a better splitter thus better flow than the USDM WRX heads but will not flow as well at the NA 2.5L DOHC at the upper revs.

Here we have the '97-'99 NA DOHC 2.5L head with a STi Ver 7 BIG PORT. The NA DOHC 2.5L is slightly wider, but isn't as tall at PORT ENTRY. Subaru filled the part across from the INJECTOR BOSS to increase flow for NA application at lower revs. BUT YOU CAN SEE They BOTH share the same D-STYLE PORT RUNNER casting w/ skinny splitter.

Here's the COMBUSTION CHAMBER of the STi Ver7 and 97-99 NA DOHC 2.5L head. The STi head flows better at lower lift because there's no material to block airflow like the clovered NA DOHC 2.5L head.

Here's the PORT of an STi EH20G head. The SVX ports are the same like these in casting and also SIZE. There's also valve guide support, which is not there on the newer heads; '96+ but share the same splitter. These in the pic are the factory ported ones where they sharpened the splitter and smoothed out the port entry; '95 MY head. They'd be FAT splitters like the 2nd pic (STi Vers 3; MY96).

The '96 USDM NA DOHC 2.5L BELOW DOES have the SAME casting as the STi Version 3 head. The port is not ported from factory though (although my friend did touch it some in the pic). The 1996 NA DOHC 2.5L is the only engine with BIG PORT that the US has. It has the Hydralic valvetrain stuff, the '97-99 doesn't. Everything else got smaller and smaller.

Matt Monson · Post by **Matt Monson** » Tue Dec 12, 2006 6:03 pm

OMFG,
We have been corrupted with a NASIOC invasion...

If someone wants to host them for me, I have 2 charts of flow numbers. These were done by Cobb at 28". They compare the SOHC Ej25, the DOHC, EJ25, the EJ205, the Ej22T, and a set of ported SOHC Ej25 heads. One chart is intake and one is exhaust.

The DOHC EJ25 heads do outflow the Ej205 heads in stock form. But it's really a mute point for us old Legacy people because without significant EM changes, our cars don't work well with the phase II cam sensors and trigger points. There's very few members here who have made the Ej205 heads work on their cars and they spent an awful lot of money to do it...

And for the record, HKS makes a cam that is a drop in replacement for the DOHC Ej25 heads. Or, you could have Web make you a cam. Or Delta. There's many options. But personally, seeing what has been done by others with those heads, I wouldn't spend my own money going that route. Many people put down well over 300whp with bone stock DOHC Ej25 heads...

Post by **Legacy777** » Tue Dec 12, 2006 7:26 pm

Matt,

Shoot me the charts, I'll host them.

Matt Monson · Post by **Matt Monson** » Tue Dec 12, 2006 8:23 pm

Thanks Josh...

I apologize for the lack of actual numbers. I have them somewhere on my computer, but I just can't find them right now. My memory says Ej22T is around 180cfm, while SOHC Ej25 is around 240, for intake...

FuJi K · Post by **FuJi K** » Wed Dec 13, 2006 3:32 am

Matt Monson wrote:OMFG,
We have been corrupted with a NASIOC invasion...

oi! FYI, I was on NASIOC since Jan '01 when it was still i-club. I know it has changed a lot but I'm not here to start problems.
Just posting how the DOHC looks like compared to the WRX heads, and of course the '96 heads....etc..... I'd keep this all to myself but I'm nice enough to show the interWebs on my findings. If not appriciated then I'll just keep them to myself.

Matt Monson · Post by **Matt Monson** » Wed Dec 13, 2006 5:36 pm

Fuji,
Don't be so sensitive. Relax man, it was a joke. Yourself, Tmarcel, and Tzedek (not to mention azn2nr) are all pretty active on NASIOC. It was just funny to find a string of posts all in a row by you guys. I felt like I had gone through a wormhole to a thread on NASIOC...

ps. If you wanna get old skool, go look at my join date and member number on NASIOC...

And with that, let's take this topic back on track before I need to start pruning it (including my own posts)...

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EJ22t w/ Phase I 2.5 DOHC Heads (PICS)