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Old 02-02-2013, 10:00 AM   #501
FuJi K
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If you went with a '95 EJ22e head, it would benefit you more with porting work since you're keeping it NA, I'm assuming.

Keeping intake velocity high, blend the seats to the runners. Round off any sharp edges. The exhaust work on the blending and smooth out the short turn if it's a sharp turn like a B25 STi head. You can widen the for some if it can be. The splitter can be ported to free up a pathway for exhaust had to move around the valve.

The phase 1 valves are just small. If i had to suggest a simple NA build a '97-99 EJ25D head on a '00 EJ25 NA with STi HG would give you more grunt.

As for the WRX heads, if any porting at a minimum blend the valve seats, you can make the short turn of the exhaust smoother. Radius valve job with back cut on valves. Now if it was running a GTX3582r, I'd say start enlarging the intake ports some and get some 272 cams with better valve springs
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Old 02-03-2013, 03:42 AM   #502
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Quote:
Originally Posted by FuJi K View Post
If you went with a '95 EJ22e head, it would benefit you more with porting work since you're keeping it NA, I'm assuming.

Keeping intake velocity high, blend the seats to the runners. Round off any sharp edges. The exhaust work on the blending and smooth out the short turn if it's a sharp turn like a B25 STi head. You can widen the for some if it can be. The splitter can be ported to free up a pathway for exhaust had to move around the valve.

The phase 1 valves are just small. If i had to suggest a simple NA build a '97-99 EJ25D head on a '00 EJ25 NA with STi HG would give you more grunt.

As for the WRX heads, if any porting at a minimum blend the valve seats, you can make the short turn of the exhaust smoother. Radius valve job with back cut on valves. Now if it was running a GTX3582r, I'd say start enlarging the intake ports some and get some 272 cams with better valve springs
Hi, yes I am going to keep this engine NA. If I went with the 95 ej22 dual port head route, then I have to buy a new header, which I was trying to stay away from. But, I do know the dual port 95 2.2 heads flow a little better though. My friends subaru shop where he works has a number of dual port ej22 heads in back....lol Any way, so blending the valve seat and the splitter, was thinking of ovaling the exhaust port some and porting my header/exhaust flange transition a bit to help with flow.

One other thing, I have seen a number of your photo's of ported head chambers to match a certain block like a 2.2 and 2.5 block. Since I am using the ej22 phase 1 heads and a cometic hybrid head gasket, how much material should I remove if any from the 2.2 head chamber in order for it to match the quench area for the ej251 piston and the head and then the bore diameter to the diameter of the chamber of the 2.2 head? Is it good to have no over hang from the side of the head chamber in relation to the cylinder bore, or should I leave just a bit of over hang? I was actually hoping to open up the head chamber diameter to match the bore completely while being able to deshroud the valves some and get rid of the lip around each valve.
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Old 02-03-2013, 05:59 AM   #503
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You can certainly widen the sides of the chamber to match the bore. It'll help just like you say.

I bought this header from "kostamojen" back in the day. It's now converted to a turbo setup but would have been the better NA header out there. The single ex-port 2.2L guys would purchase your header no doubt if you where looking to sell it. There shouldn't be a problem not finding a buyer.
http://www.rs25.com/forums/f5/1115945-post90.html


What i had it turned into (work done by fobiaWRX)
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Old 02-03-2013, 10:39 AM   #504
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That's looks nice
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Old 02-05-2013, 06:34 AM   #505
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All I can say is WOW! Fuji your the man, for realz I do have a couple questions I will send in the morning. Thanks for all the great info man, very much appreciated and dude for real SKILLZ!
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Old 02-09-2013, 03:18 AM   #506
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Hey I commented on one of ur youtube videos along time ago op...... The work looks really good. now if u could come clarify some things for me in my head porting thread on that would be awesome (I don't want to clutter yours)


Mike
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Old 02-14-2013, 12:02 PM   #507
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Originally Posted by FuJi K View Post
Ya, the large ports are with the water bottle cap. There are different caps so you have to get the right one. Some are a little larger. lol

As reference; roof side is the valve guide side.
http://forums.nasioc.com/forums/show...3&postcount=80
Wouldn't it be a good idea to cut off the top of the cap so you just have a ring that is flexible and would relate better to the cross-sectional area than a "round" cap would?
Should I be looking for a cap that has the same area as at the valve seat?
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Old 02-14-2013, 01:21 PM   #508
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Should I be looking for a cap that has the same area as at the valve seat?
no.
That would give it more area than the valve uses. The valve and valve stem occupy space
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Old 02-14-2013, 03:42 PM   #509
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The cap i use is 29.66mm round.
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Old 02-14-2013, 08:55 PM   #510
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Hey FuJi,

So, basically I should be blending the bowl but make it an arch where the bowl connects to the throat correct?

For the intake ports of the phase 1 ej22 head, should I just clean up the casting or widen the throat just a bit then blend it with the sides or take a bit off the floor for slightly more volume?

If some material is taken off the floor and the sides but not the roof, what effects would that cause? Looking to finish the porting on my ej22 heads for the intake ports and the exhaust side. Going to leave the intake side at 80 grit if I can and 120 on the exhaust side.
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Old 02-14-2013, 09:09 PM   #511
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no.
That would give it more area than the valve uses. The valve and valve stem occupy space
Seems this is true, but only in a small context. When the intake valve opens fully it is at 11.3 mm height (Kelford 220-C intake lift), and the valve opening area is roughly 1159 mm squared versus the bottle cap at 691 mm squared. How can you say that, going by the seat ID, a larger bottle cap's area would be more area than the valves use? Is there a venturi effect going on here where you want it necked-down to increase the speed as it hits the valve opening? I know I have read that good mixing due to swirling at the entrance to the combustion chamber, is a good thing.
I'm all ears!
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Old 02-15-2013, 01:56 PM   #512
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Seems this is true, but only in a small context. When the intake valve opens fully it is at 11.3 mm height (Kelford 220-C intake lift), and the valve opening area is roughly 1159 mm squared versus the bottle cap at 691 mm squared. How can you say that, going by the seat ID, a larger bottle cap's area would be more area than the valves use? Is there a venturi effect going on here where you want it necked-down to increase the speed as it hits the valve opening? I know I have read that good mixing due to swirling at the entrance to the combustion chamber, is a good thing.
I'm all ears!

you asked if I we wanted the same diameter cap as the valve. I said no because it would have more area because the valve takes up space.

This is true.

Now you're asking a totally different question, but on the grounds that what I said wasn't true.... let's stick to one thing at a time.

Airflow around a valve, be it in or out of the cylinder, is no where near as good as airflow through a port. Port flow is supposed to be laminar flow. Once it separates to go around a valve you create turbulence and resistance to flow. ANY created turbulence is resistance to flow. You can't create turbulence without resistance as the energy has to come from somewhere.

In other words, it takes a larger valve opening to have the same flow rate as a port. Opening the port to be as large as the valve would absolutely RUIN the way the engine runs. You would have no port velocity, no throttle response, terrible atomization. I think I stated earlier in the thread (or maybe it was a different one) that proper porting is not just about flow numbers. Port design is about velocity control. When you remove material from a port, you increase total port volume. This lowers port velocity. Whatever porting you can do to increase flow capacity without lowering velocity is the best way to do it. That usually means finding the restriction in the port and getting rid of it with as little material removal as possible. This is why my Signature series heads make more power, more torque and get better gas mileage than the Cosworth big port heads and Axis/RAW Signature heads. I would venture to guess that Fuji's heads do better than cosworth as well, but I haven't had them in my hands to test.
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Old 02-15-2013, 02:36 PM   #513
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Now you're asking a totally different question, but on the grounds that what I said wasn't true.... let's stick to one thing at a time.
I certainly didn't mean to insinuate that what you said wasn't true. If I question things it's just because I want to understand why and not accept things at face value. After all, I am porting my own heads and the more I know the better the results. So, no insult intended and I really appreciate all the information. As I said, "I'm all ears". But it may raise questions in my mind. I have read just about everything I can find on the internet and here in the forums about porting in general and specifically porting these Subie heads.
If you are using forced induction isn't porting less critical?
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Old 02-15-2013, 03:35 PM   #514
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Less Critical?
Well that totally depends. You still have restriction. Only instead of your pressure being a difference of about 28" you have pressure difference of 56" (14.7 psi of boost) or more.
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Old 02-16-2013, 07:09 AM   #515
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OK, That was poorly worded. Prior to the injectors, isn't the size and shape of passages far less important than in the heads? I could see ridiculously big runners negatively affecting response. Perhaps a Cosworth intake on a stock motor might be a bad idea?
But in the case of internal and alignment mismatch restrictions and overall smaller size (like using my stock manifold with my BW 9374 turbo, couldn't you overcome some inefficiencies by just tweaking the boost a little? Isn't there some response and low-end torque benefits to be had from a smaller manifold?
Thanks
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Old 02-16-2013, 01:30 PM   #516
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OK, That was poorly worded. Prior to the injectors, isn't the size and shape of passages far less important than in the heads? I could see ridiculously big runners negatively affecting response. Perhaps a Cosworth intake on a stock motor might be a bad idea?
But in the case of internal and alignment mismatch restrictions and overall smaller size (like using my stock manifold with my BW 9374 turbo, couldn't you overcome some inefficiencies by just tweaking the boost a little? Isn't there some response and low-end torque benefits to be had from a smaller manifold?
Thanks

no
The entire intake tract is important. The intake and runners are not a smooth continuous flow. The charge is a pulsing, moving, column of air. There are things like reversion, and resonance that all play a very important role in proper charge characteristics.

This isn't the thread for this. Sounds like you have a LOT of reading ahead of you.
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Old 02-16-2013, 03:10 PM   #517
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I was gonna say....I mean isn't this Fuji's Double D head port thread??......
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Old 02-16-2013, 04:41 PM   #518
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Technical discussions are fine that involve the science behind head porting. It all goes hand in hand.


Dom, you want me to send a head out that way?
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Old 02-16-2013, 07:49 PM   #519
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Technical discussions are fine that involve the science behind head porting. It all goes hand in hand.

Dom, you want me to send a head out that way?
I figured so but I was just busting Dom's balls!
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Old 02-18-2013, 11:57 PM   #520
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Technical discussions are fine that involve the science behind head porting. It all goes hand in hand.

Dom, you want me to send a head out that way?
Well..... probably not. I would love to see your work in person, but I don't see any gain in it for you. I'd hate to see you waste time. You seem pretty busy.
It would only be to satisfy my own curiosity. We are too far apart for me to use you for head porting.
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Old 02-22-2013, 10:49 AM   #521
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I'm about finished with porting of my W25 heads for +1mm valves. I am trying to decide when to quit.
Besides the obvious and fairly visible places where you can see the potential for breaking through, are there areas that I need to know about that might start off thinner than most areas?
I am particularly curious about the dogleg port ceiling.
Besides fancy tools like a sonic tester (@$1200), is there anything I can employ to help detect when the wall is getting thin? I seem to be able to detect a slight difference in sound when I tap on thinner areas, for example.
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Old 02-22-2013, 11:37 AM   #522
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Do not attempt to straighten it a lot by the bottom middle head stud hole. The roof side of our heads are same thickness from seat to near the exhaust studs. I do not "raise the roof" of the exhaust due to the limited thickness.

Your best interest is to focus on the corners right at the short turn and smooth them up along with a smoother short turn, and the splitter on that dog leg.
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Old 03-04-2013, 08:10 AM   #523
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Default Scargod ported heads

Just finished head work for big valves (seats have yet to be cut). I'm an amateur with about a half-dozen various heads I've done in the past. My second set of Subaru heads.

Combustion chamber de-shrouding and polishing. A different light spectrum source was used for exhaust and intake ports. Seat ID's have been enlarged.

I think this image has an eerie quality to it. Passes the bottle cap test.

The mofo. Bought six inch long shank burrs for this area. Though round opening could have been bigger, the diameter matches my Full Race headers.

Finished W25 heads. Here you can see that I ground on openings to the water passages to match them to the head gasket openings. I was surprised that they was a fair amount of material I could remove to optimize flow. Also matched and blended the oil passages. Heads are fully deflashed and deburred. Lots of sharp places on these heads!
Attached Images
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File Type: jpg _3004337-Edit.jpg (131.8 KB, 358 views)
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File Type: jpg combustion chamber-2.jpg (104.3 KB, 376 views)
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Old 03-04-2013, 10:16 AM   #524
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They look great! They'll flow much better for sure.
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Old 03-04-2013, 02:37 PM   #525
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^^^ I second that. They look great
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