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Old 04-23-2012, 11:21 AM   #426
FuJi K
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Quote:
Originally Posted by maxpowr
very nice mr fuji. how many hours do you estimate in a single head in your last youtube video?

looking forward to showing my machinist the limits you have found.
up to 16hrs doing the JDM to Double-D sized ports. This includes the full porting in all the runners, around the valve guide, and valve seat blending to the runners. I don't ever enlarge the exhaust port outlets at all. The intake inlets of the 2L heads i gasket match, excluding the injector area. All the porting is done inside the runners.
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Old 04-23-2012, 12:05 PM   #427
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you're my hero FUJI K!!
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Old 05-03-2012, 10:46 AM   #428
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exhaust short turn comparison on B25 heads.




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Old 05-03-2012, 10:58 AM   #429
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I thought material removal on short turn or "floor" areas were fairly inconsequential and actually decreased flow rate (relatively).
I thought you were supposed to concentrate on "ceiling" areas or the big, outer radius (other than normal cleanup and blending).
Please explain.
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Old 05-03-2012, 02:05 PM   #430
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You can actually find gains in 'flattening/widening' the floor. You don't want to lower it though. It makes for a more acute angle of flow and going too much, you'll start to get separation of flow on the inside of the turn.
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Old 05-03-2012, 06:30 PM   #431
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Quote:
Originally Posted by Scargod
I thought material removal on short turn or "floor" areas were fairly inconsequential and actually decreased flow rate (relatively).
I thought you were supposed to concentrate on "ceiling" areas or the big, outer radius (other than normal cleanup and blending).
Please explain.
Generally speaking some heads are very good from factory, i.e. B18 ITR honda head. Some heads really suck and start off with room for improvement.

If the head allows you to reshape the port, have at it. When its wall thickness limits you on reshaping, you just have to work with what you got.

With that said, the B25 heads could use an improvement on the exhaust ports as seen in the pictures. You can gain 30+cfm by just smoothing up the short turn and widening it up.
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Old 05-04-2012, 11:18 AM   #432
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^^I still wonder what on earth Subaru was doing when they put that harsh turn on the dogleg side of the B25 heads.
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Old 05-04-2012, 11:31 AM   #433
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they should have kept it like the WRX head. I show all the STi guys the exhaust ports they have. I tell them to finger the ports so they can feel the difference. lol
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Old 05-06-2012, 05:29 PM   #434
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having a vacuum helps keep them shavings to a minimum

2L head for 257-like chamber work
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Old 05-06-2012, 06:17 PM   #435
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i wish i was having fun like that...
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Old 05-06-2012, 06:45 PM   #436
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Fuji, I am surprised that you use single-cut burrs. Do you finish with a double-cut before you sand? How do you have good control with a single cut?
I believe you use electric power with a flex shaft, like a Foredom, correct? I used to have that. Only does 15,000 RPM. I currently use air, as I have just started porting my own Subie heads. I have another set to do in the near future.
Just wondering why you use what.
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Old 05-06-2012, 10:18 PM   #437
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i use the single cut to bring what ever I'm porting out to where I want it before switching to a double cut. then yes finally sand rolls, tapers from 80, 120, 240 grit. The single cut is a little catchy, but you can master it. My Makita is the GD0800C model with a low rpm of 7000 to start off, which is where I run it.

tools for chamber work


with the single cut
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Old 05-06-2012, 11:06 PM   #438
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Is that makita the rotary tool you're using? If it is what model is it? I'm wanting to get back into porting just don't have the space for a big air compressor.
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Old 05-06-2012, 11:10 PM   #439
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Quote:
Originally Posted by 2gnt2wrx
Is that makita the rotary tool you're using? If it is what model is it? I'm wanting to get back into porting just don't have the space for a big air compressor.
i have the model posted above.

here is after the small oval double cut bit, next is just sand roll and then round off the edges on the sides. porting this head as we speak
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Old 05-07-2012, 12:52 AM   #440
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and here is the finished with sand roll on the right VS double cut on the left.


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Old 05-07-2012, 04:07 AM   #441
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and the finished chambers
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Old 05-07-2012, 11:19 PM   #442
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What do you use to measure the ports and combustion chamber? Do you cc both or just go off of flow charts?
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Old 05-07-2012, 11:31 PM   #443
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Quote:
Originally Posted by wrxsubiemod
What do you use to measure the ports and combustion chamber? Do you cc both or just go off of flow charts?
the ports are all ported the same way, whichever style it is.

the bottle cap makes a good reference. I also have a few templates that i made. I only remove material in certain areas.

Last edited by FuJi K; 05-08-2012 at 12:51 AM.
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Old 05-07-2012, 11:50 PM   #444
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Yeah I understand that just wondering if you measure how much you port out or how you ballance them.


I guess best way would be to flow each runner. Cc'ing them would be nice but really can't get a real world reading of how they would do that way.

Great job on the heads man! When you cut the valve guide's inside the head is it just that? Use a reemer and call it good? Was looking into doing that but just unsure if I need to use smaller guides or just cut and port them out
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Old 05-08-2012, 01:07 AM   #445
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i don't mind grinding away at the valve guides. Our guides don't come out as far as some other heads out there. Also there is extra clearance at the top part of the guides if you look closely into the guide from the combustion chamber side. Just make sure to clean up the inner edge with a reemer if you have one so excess material doesn't start scraping away at the valve stem.

I've flowed tested these heads in the past and they've given me a good feel of where they flow. They get ported a certain way depending which it may be; DD, Baby D, etc. The ports get reshaped.


Last edited by FuJi K; 05-08-2012 at 01:49 AM.
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Old 05-10-2012, 01:58 AM   #446
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after looking at the clock... seems to take up to 6hrs to gut the intake ports out along with shaping the splitter with my single cut bit. i left room for the double cut to come in to bring the ports out to where they should be. These are going to get the Double-D treatment.



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Old 05-10-2012, 02:22 AM   #447
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here is a stock B25 vs ported one i just recently finished for a friend.



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Old 05-10-2012, 09:30 AM   #448
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Quote:
Originally Posted by FuJi K View Post
here is a stock B25 vs ported one i just recently finished for a friend.
Mine look a lot like what you have done but I was afraid of taking out so much of the divider in the intake.
See the rest of the pictures, too. I'm in the process of buttoning up the engine.

I want to build a downdraft grinding table with attachments so I can also suck directly on the ports I am working on. I have a wood shop, so I have a powerful Rockwell dust collector in the basement to do the sucking.
I have another engine to build in the future so I will be doing more heads. Just my own and just for the fun of it... I think a Foredom is in my Christmas stocking already.
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Old 05-18-2012, 04:45 AM   #449
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here is a 2L head with 257-like chamber work and all assembled

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Old 10-01-2012, 04:25 PM   #450
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Quote:
Originally Posted by FuJi K View Post
there's not so much more room on these USDM heads anymore to really make them big. You come really close to almost porting through the water jackets! The USDM 2.0L have good meat though as with your JDM big port heads. I think I need to pick up a bad USDM STi head to see how are out I can go. lolz

I'm just concern about the roof. The floor is already shaped like so... and so I have to go off of that... unless I go CNC. Yours look great!! I'm sure they can breath well up to 9000rpms!!!! Drag motor??

So i assume that double d port is not an issue on ej205 head correct? Thinking 2.1l more and more

Also, do you have any idea on price (general/rough idea) to convert to shimmles buckets?
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