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Old 03-25-2009, 08:19 PM   #1
FuJi K
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NF Performance

Default Double-D Series head ports!!!

USDM heads with the Double-D treatment. This is some porting I've been doing. You can follow along and make your heads flow well too! All the details are in the pictures! I have some flow numbers throughout the thread of some findings. I also have pictures of other heads I've worked on for a few friends.



These are my personal heads I've been working on. A set of '06 WRX D25 heads with my fancy "Double-D" porting. Basically it resembles the JDM Ver8 big port heads in the intake port runners. The JDM heads flow very well so might as well duplicate them!!!
'06 EJ255




Valve lifts are measured with STi cams fitted and rotated for measurement. Dial gauge was measured at an angle so actual lift points are actually a tad shorter than what they really are.
Stock '06 EJ255 heads
Intake:
.100" = 86cfm
.200" = 177cfm
.300" = 237cfm
.397" = 253cfm

Exhaust (straight)
.100" = 72cfm
.200" = 145cfm
.300" = 185cfm
.398" = 203cfm

Exhaust (dog leg)
.100" = 72cfm
.200" = 142cfm
.300" = 180cfm
.400" = 192cfm



New numbers with a 5angle valve job with blending afterward. A bit more work on the exhaust ports especially the dog leg to bring out some more CFM.
Intake:
.100" = 90cfm
.200" = 185cfm
.300" = 251cfm
.390" = 283cfm

Exhaust (straight)
.100" = 84cfm
.200" = 165cfm
.300" = 208cfm
.400" = 225cfm

Exhaust (dog leg)
.100" = 90cfm
.200" = 164cfm
.300" = 206cfm
.400" = 220cfm

Stock valves, no valve job. Superflow600@28"
Intake:
.100" = 87cfm
.200" = 177cfm
.300" = 254cfm
.398" = 283cfm

Exhaust (straight)
.100" = 81cfm
.200" = 160cfm
.300" = 202cfm
.400" = 225cfm

Exhaust (dog leg)
.100" = 75cfm
.200" = 150cfm
.300" = 191cfm
.400" = 211cfm





Here are pics of some of my porting work for your pleasure.
B25 head with Double-D treatment and +1mm valves with multi-angle valve job
http://forums.nasioc.com/forums/show...&postcount=166

B25 head with Double-D treatment
http://forums.nasioc.com/forums/show...&postcount=286

S20 head with Baby-D treatment
http://forums.nasioc.com/forums/show...&postcount=305

S20 head with Type-C treatment
http://forums.nasioc.com/forums/show...&postcount=314

Stock USDM small ports vs Type-C vs Double D port runner size
http://forums.nasioc.com/forums/show...&postcount=317

Combustion chamber work; 257-look-a-like
http://forums.nasioc.com/forums/show...&postcount=449

Combustion chamber work; Flared out to match 97mm+ bores
http://forums.nasioc.com/forums/show...&postcount=355

.....




http://forums.nasioc.com/forums/show....php?t=1475616

Last edited by FuJi K; 05-18-2012 at 06:39 PM.
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Old 03-25-2009, 10:56 PM   #2
Crystal_Imprezav
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Doesn't look like you got too much into the bowl. Get in there and do some work as that is where you will get the most improvement. Just make sure you know the limits and don't go into the coolant passages.
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Old 03-25-2009, 11:27 PM   #3
FuJi K
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See if this video help see better...

Ya, I just am not sure where my limits are. However I have removed quite a bit of the sides, say probably 2-3mm. More research!!! I need to find a dead head so I can cut it apart to see how thick it is. ekkkKK!!!






'04 EJ257


[size=1]
Stock valves, no valve job. Superflow600@28"
Intake
.100" = 84cfm
.200" = 172cfm
.300" = 246cfm
.398" = 276cfm

Exhaust (straight)
.100" = 75cfm
.200" = 155cfm
.300" = 203cfm
.400" = 219cfm

Exhaust (dog leg)
.100" = 72cfm
.200" = 152cfm
.300" = 192cfm
.400" = 205cfm


stock '05 STi heads flowed after a bead blasting. Same casting '04-'06 EJ257

Intake:
.100" = 81cfm
.200" = 166cfm
.300" = 231cfm
.402" = 248cfm

Exhaust (straight)
.100" = 84cfm
.200" = 166cfm
.300" = 188cfm
.396" = 195cfm

Exhaust (dog leg)
.100" = 78cfm
.200" = 155cfm
.300" = 174cfm
.396" = 178cfm

Last edited by FuJi K; 03-25-2010 at 11:32 PM.
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Old 03-26-2009, 01:48 AM   #4
FuJi K
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STOCK EJ257. eewwWWWW



Last edited by FuJi K; 03-26-2009 at 01:53 AM.
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Old 03-26-2009, 09:24 AM   #5
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wow, looking at the stockers and then looking at my heads made me laugh...I had forgotten how much I took off of the roof and in the bowl...also check your floor on the turn, as you'll be pushing some high cfm due to shape. It'll also try and push your air out instead of turning into the valve.

Also be sure that you aren't helping to impenge flow on the cylinder wall with your ports...if you are getting flowbenched, a decent place should have a pitot tube setup for you to use.

Getting those critiques (the velocity that is) will help you take out the 'rough' spots of the port. Looking good!
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Old 03-26-2009, 11:56 AM   #6
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may be a stupid quesion, but what keppened to the valve guide? and how would you go about using a dead head to see how much you can port out?
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Old 03-26-2009, 06:48 PM   #7
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Homemade, you got any good pictures of how much bias you put in the short turn towards the cylider wall?
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Old 03-26-2009, 07:30 PM   #8
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is it good to remove that much of the divider (knifed edged) on the intake?
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Old 03-26-2009, 09:29 PM   #9
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This may help you visualize how much and where you can port.

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Old 03-26-2009, 10:57 PM   #10
FuJi K
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Quote:
Originally Posted by Crystal_Imprezav View Post
This may help you visualize how much and where you can port.
Awesome pic!!! That's what I need to do to a dead head.

Quote:
Originally Posted by seanathanq83 View Post
may be a stupid question, but what happened to the valve guide? and how would you go about using a dead head to see how much you can port out?
The valve guide was "killed" to allow a tiny it more CFM flow in that valve bowl area. Finding a dead head so I can cut top to bottom and sideways to see how THICK the walls are so I know how much I can widen and and how much taller I can go. Kind of like the pic above of the head cutaway pic. Allows you to see the coolant and oil passages.
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Old 03-27-2009, 12:00 AM   #11
bugeyesubie
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if you look at the picture its looks as it it is a cosworth cutaway, meaning those ports or ported out alot. i would asume the port walls would be similar thickness on a stock head, perhaps cosworth takes more off the bottom. both look beautiful thought
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Old 03-27-2009, 01:44 AM   #12
seanathanq83
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i ihave a dead big port 207 head, if you want maybe we can work a deal, where we can use it to contribute to the scooby community
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Old 03-27-2009, 01:45 AM   #13
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also looks like the exhause can be cleaned up alot right behing the valve
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Old 03-27-2009, 11:37 AM   #14
FuJi K
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These are the only two detailed pics of the COSWORTH heads I have.

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Old 03-27-2009, 12:13 PM   #15
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Quote:
Originally Posted by slowmike View Post
Homemade, you got any good pictures of how much bias you put in the short turn towards the cylider wall?
I have pics on my build thread...its in built motor with my name in the title.

Quote:
Originally Posted by FuJi K View Post
These are the only two detailed pics of the COSWORTH heads I have.

I had never noticed how they flattened the floor too...I wonder how they blended it into the valve seat area though.
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Old 03-27-2009, 12:16 PM   #16
seanathanq83
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so should i be making sure the guides are cut down to where they are even with the port?
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Old 03-27-2009, 12:42 PM   #17
FuJi K
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Quote:
Originally Posted by seanathanq83 View Post
so should i be making sure the guides are cut down to where they are even with the port?
i have a dead big port 207 head, if you want maybe we can work a deal, where we can use it to contribute to the scooby community
You can if you want for a few CFMs when you're at high rpms. I'll do it to mine just because it's easy gains. These '06 WRX heads are a bit different from my '03 WRX heads... *sigh*
The JDM Big port is nice, but I want to cut away at a USDM one. I don't want to cut the JDM one, it'll hurt it!! hehehehe


Here's some JDM Version 6 STi heads for reference.
http://forums.nasioc.com/forums/show...1#post26035191



Quote:
Originally Posted by Homemade WRX View Post
I had never noticed how they flattened the floor too...I wonder how they blended it into the valve seat area though.
They kept the splitter like OEM. This allows them to just go lower in the middle. For my D-style I can't because I made a corner at the splitter. If I was making it flat from the middle of the runner to the splitter, I think I'd go through the head. lolz
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Old 03-27-2009, 01:57 PM   #18
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Quote:
Originally Posted by FuJi K View Post
They kept the splitter like OEM. This allows them to just go lower in the middle. For my D-style I can't because I made a corner at the splitter. If I was making it flat from the middle of the runner to the splitter, I think I'd go through the head. lolz
I think you are missing the point of what I'm talking about...notice how the bottom doesn't look so much like a semi circle but more like a flat buttom with radiused corner...the splitter has nothing to do with it. Its also normally bad joo-joo to removed from the floor. It makes for an even harder turn for the flow into the cylinder.

I just realized how awesome that block is for checking piston to valve clearances for new cams and pistons.
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Old 03-27-2009, 03:46 PM   #19
FuJi K
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Quote:
Originally Posted by Homemade WRX View Post
I think you are missing the point of what I'm talking about...notice how the bottom doesn't look so much like a semi circle but more like a flat buttom with radiused corner...the splitter has nothing to do with it. Its also normally bad joo-joo to removed from the floor. It makes for an even harder turn for the flow into the cylinder.
Yes, I see what you mean. However the phase 2 DOHC heads are much better than the phase1 heads. The phase2 the ports are further away from the block than phase1. They aren't that bad because the head cutaway shows it. As long as the intake isn't like the exhaust side, which the phase1 where close to being the same slope/shape. The short turn is where it's gonna matter.
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Old 03-27-2009, 12:26 PM   #20
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I don't cut mine away as I know of several cases where it has caused premature wear.

You can if you want.
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Old 03-27-2009, 01:05 PM   #21
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are you seeing any substantial gains with porting?
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Old 04-06-2009, 01:58 AM   #22
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Quote:
Originally Posted by mxpunk View Post
are you seeing any substantial gains with porting?
are you asking about his porting or in general?

if in general:
yes huge gains can be had by porting. 40+% gains in exhaust flow and 20+% intake are standard with properly ported heads.
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Old 04-05-2009, 10:10 PM   #23
FuJi K
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The work so far. Cleaned up the valve throat area.





Last edited by FuJi K; 04-05-2009 at 10:25 PM.
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Old 04-06-2009, 08:36 PM   #24
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have you had these on a flow bench yet Fuji? I would like to see what you get. also I have some ej257 and 255 heads that I may be interested in parting with.
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Old 04-06-2009, 10:55 PM   #25
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Lets see the exhaust side. Thats where the magic happens!
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