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Old 06-13-2008, 12:29 AM   #176
FuJi K
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This is the matching PISTONS that came on this '96 motor. All the '97-'99 runs different pistons.
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Old 09-11-2008, 01:45 PM   #177
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Wow those are really different FuJi K...are those still interference engines?

Do you have a picture of the valve cover?

Last edited by bubba2533; 09-11-2008 at 01:52 PM.
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Old 09-11-2008, 09:59 PM   #178
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Quote:
Originally Posted by bubba2533 View Post
Wow those are really different FuJi K...are those still interference engines?

Do you have a picture of the valve cover?
I believe they are non-interference in this year. The valve cover is the same as this one
http://i18.photobucket.com/albums/b1...96EJ25NA03.jpg
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Old 09-12-2008, 12:45 PM   #179
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Quote:
Originally Posted by FuJi K View Post
I believe they are non-interference in this year. The valve cover is the same as this one
http://i18.photobucket.com/albums/b1...96EJ25NA03.jpg
Ok, I was hoping they were non-interference.

I was acctually looking for a picture showing the spark plug hole.

I have been thinking of a setup I would like to start gathering parts for and I am still researching to find out if it will even work.

I'll start my own thread soon. I don't want to clutter yours as it has tons of great information.

Thanks,
Branden
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Old 09-12-2008, 04:07 PM   #180
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Quote:
Originally Posted by bubba2533 View Post
Ok, I was hoping they were non-interference.

I was acctually looking for a picture showing the spark plug hole.

I have been thinking of a setup I would like to start gathering parts for and I am still researching to find out if it will even work.

I'll start my own thread soon. I don't want to clutter yours as it has tons of great information.

Thanks,
Branden
I can get a picture of it if you want of the '96 heads. conbustion chamber or the outside???
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Old 09-12-2008, 04:49 PM   #181
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Someone correct me if I am wrong but aren't ALL DOHC Subaru engines interference? They are valve to valve interference even if they are not valve to piston interference.
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Old 09-12-2008, 05:14 PM   #182
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The '96 has cuts into the piston, which makes it look like a non-interference. The '97+ doesn't. But I don't know.... that's just what I can make out from the pistons.
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Old 09-12-2008, 06:29 PM   #183
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Yeah, I would think it would be non-interference also because it has lower compression


FuJi K - I am really trying to look into if the coil from a 02 WRX will fit on the 96 DOHC head

Last edited by bubba2533; 09-12-2008 at 06:58 PM.
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Old 09-15-2008, 03:17 AM   #184
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Those 96 heads and pistons look like they are higher compression than wrx. They have the cloverleaf head and the pistons appear to have valve reliefs and that means higher compression. Thats probably not a turbo motor but a na motor.
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Old 09-15-2008, 08:06 PM   #185
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Quote:
Originally Posted by charliew View Post
Those 96 heads and pistons look like they are higher compression than wrx. They have the cloverleaf head and the pistons appear to have valve reliefs and that means higher compression. Thats probably not a turbo motor but a na motor.
The '96 heads are not clover like the 97'-'99. The pistons are a high compression style piston though. The '96 motor advertises as a 9.5:1 compression ratio.
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Old 09-18-2008, 01:03 AM   #186
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Here's a current project.
very MILD port.
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Old 09-18-2008, 07:58 PM   #187
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Chimera Hand Ports...















Evan
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Old 09-22-2008, 10:43 AM   #188
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I would like to see the flow numbers on those heads.

That head has severe pitting on the sealing surface of the right intake port. The picture of the two intake ports appears that one port has had way more sanding roll finishing than the other. The port on the left has a lot more thinning of the splitter so far the work appears to be visually making the whole port bigger, until they are flowed on a bench who knows what improvements have been achieved. My thoughts are small material removal and flow testing at each .050 of valve lift after each slight removal,to avoid removing material in the wrong areas. It's real hard to overcome too much removal in the wrong places. It usually shows up in the low lift range as a loss and thats where the street motor needs the most help. Just making everything bigger might only be a improvement at 7k and a 10 or 20% loss at the 3k range. The true good porting job will show beginning flow test results and ending results and the average gain is what can be bragged about. The low flow numbers is what makes the biggest difference on the street. Also when the guides are shortened the possibility of oil getting past the seals increases and detonation occurs much easier also the valve wears the guide quicker as there is less area in the guide.

Last edited by charliew; 09-22-2008 at 10:59 AM.
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Old 09-23-2008, 09:59 PM   #189
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Old 03-18-2009, 12:00 PM   #190
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I was VERY VERY curious if the '06 WRX heads would work with my EJ22T setup. So I HAD to get that '06 WRX head off over at my friend's house. With and hour or so we got the head off because we couldn't get the exhaust cam gear off. The back timing belt cover broke when the car got into a slight frontal collision so we just finished it off and got the exhaust cam off after the AVCS bracket came off.

I brought over my EJ22 HG just to measure. The EJ257 heads are a it wee wide, 99mm or so and my EJ22 HG wasn't wide enough in between the combustion chambers. On the '06 WRX heads, they worked out JUST FINE!!!!! I am a happy camper!!!! The combustion chamber however is a lot different from the EJ257 and EJ205. Its sides are ROUND.

EJ257 ('04 STi), EJ205 ('02-'03 WRX), EJ255 ('06 WRX)


Next I looked at how thick the heads where for porting purposes. This is so I know how WIDE I can go, how much lower I can go on the short side, and the HIGH side of the intake port. The EJ205 heads have the thickest casting. You can go WIDER, and taller, and also lower on the intake ports. If you had a CNC machine, you could make them a direct replica of the JDM Big Ports. Had porting what you want to do is widen the ports down, skinny up the splitter, and make it D shape if you're like me, or just make the O's runners bigger.

EJ205 (silver) and EJ257 (gold).



Last edited by FuJi K; 03-18-2009 at 05:10 PM.
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Old 03-18-2009, 12:16 PM   #191
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CELL PHONE PIC, mind you..... LG Dare 3.2megpix hA!


What's also interesting is how much LOWER you can go with the short side at the entry. The EJ205 heads allow you to and is the same as the JDM big port heads on this side. The EJ257 heads this side is NOT thick, the EJ255 heads it has a little nub/stub that comes out which gives you some room. The JDM Big ports isn't that much lower at the entry, so you don't have to go LOW on this side at the entry. The STi heads I'm porting at the moment I am NOT going that low and especially at the splitter you don't want to because you might port through the head.


Another NEW thing is the HEAD GASKET layout with the coolant passeges. They FINALLY revised the HG. This is NOT apparent on the '04-'05 STi heads, unsure about '06+. Also notice the head coolant passages are different too. You MAY have issues running this with a OEM CLOSED DECK EJ22T. However, you might get away with an aftermarket CNC billet closed deck brace from OutFrontMotorsports. The HG is still the same 3layer thickness. Coolant still feeds bottom up.

Last edited by FuJi K; 01-30-2010 at 07:37 PM.
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Old 03-18-2009, 12:17 PM   #192
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'04 STi heads I'm working on at the moment.



Last edited by FuJi K; 03-18-2009 at 02:56 PM.
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Old 03-21-2009, 11:36 AM   #193
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JDM STi Version 6 heads VIDEO.
http://www.youtube.com/watch?v=SUfha5OiRik
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Old 03-21-2009, 11:40 AM   #194
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JDM STi Version 6 head port gallery



Last edited by FuJi K; 03-22-2009 at 06:13 PM.
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Old 03-22-2009, 06:13 PM   #195
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Old 03-22-2009, 06:28 PM   #196
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'06 WRX heads stock


'04 STi heads getting a port job.

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Old 03-22-2009, 06:28 PM   #197
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'03 WRX heads ported intake
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Old 04-24-2009, 12:10 PM   #198
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PAY CLOSE ATTENTION.
No one else will show you this. Dog leg of the '04 STi and '02 WRX heads.

EJ257 STi (slightly ported) ........... EJ205 WRX (STOCK)
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Old 05-18-2009, 07:29 AM   #199
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Hate to annoy you experts in here, but I'm trying to find some stuff out. I have an 06 2.5i and have been told the heads flow very well, but I cannot find CFM figures for them. I may have missed the specs in the blizzard of info here, so excuse my noobishness.

I have some supporting mods for flow, but if the heads are going to be my bottleneck I will need to work on them. If the heads are my restriction, I'll be holding off on mods to the flow until I get it worked on. Thanks for your time!
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Old 05-26-2009, 02:48 PM   #200
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Quote:
Originally Posted by ScubaruImpreza05 View Post
Hate to annoy you experts in here, but I'm trying to find some stuff out. I have an 06 2.5i and have been told the heads flow very well, but I cannot find CFM figures for them. I may have missed the specs in the blizzard of info here, so excuse my noobishness.

I have some supporting mods for flow, but if the heads are going to be my bottleneck I will need to work on them. If the heads are my restriction, I'll be holding off on mods to the flow until I get it worked on. Thanks for your time!
I'm not sure how the newer 2.5L SOHC heads are compared to the 99-03ish. I have to get my hands on a set of 2.5L SOHC heads again and inspect them. It'd be nice to see the newer ones if I find any. All I need would be to take off the intake manifold, and exhaust manifold to tell the difference in the shape it looks. The intake valve placement is different on them compared to the Turbo heads. When I get my hands on a set again, I'll look at the exhaust ports again. They flow well for stock heads. More gains are had with a better camshaft on the SOHC NA heads.

The intakes aren't that much different in port runner size compared to a USDM WRX/STi. However, you can't go too big on them because of how thick the casting is. Best gains are cleaning up the valve seat to the port runner if it has a step on both intake and exhaust sides. I've lightly ported the intake side to make a smoother airflow into the cylinders, that's it. Those heads already have Delta 2000 cams.
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