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Old 05-13-2011, 10:39 AM   #351
Nuke209
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Yay, now I can get those heads cleaned and installed
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Old 05-14-2011, 04:22 PM   #352
TDagen
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^So your running a set of wrx heads on the bullet eh? They really seem to work well... Mine aren't even ported and mine have been ok, so those should really kick some major ass ! No avcs now though huh?
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Old 05-15-2011, 04:25 AM   #353
FuJi K
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^^^^^
For your viewing pleasure!!!





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Old 05-15-2011, 09:20 AM   #354
TDagen
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Wow those look killer Fuji! That makes me want DD's....
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Old 07-03-2011, 02:05 PM   #355
FuJi K
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Here's some chamber work... These are going on a 2.5L block. I've rounded off the sides of the chambers after widening them up. They just have a little bit of clean up at the valve seat to the port runners. Funny cause one heads casting shifts one way and the other shifts the other direction.






Last edited by FuJi K; 07-15-2011 at 12:09 AM.
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Old 07-03-2011, 04:39 PM   #356
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I been searching here and a few other areas but cannot seem to find a good answer on the topic of Reversion. Can anyone here please explain the concept to me when it comes into tearms of high performance?

I notice oem subarus do not have a step from head to exhaust manifold, but I have noticed the use of a larger ID gaskets which most companies use to gasket match the header to. I can see this causing a reversion effect. How well does the stock gasket work to control reversion when it is used with a non ported manifold? Most I've seen, tomei, gt spec still need a little porting.

Also, when heads get ported why do most people not gasket match the exhaust ports? What would be the negative and positive sides of doing this to a race engine?

Thanks in advance and sorry if I thread jacked or if this is off topic

-Ruben
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Old 07-04-2011, 09:17 PM   #357
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Quote:
Originally Posted by FuJi K
Here's some chamber work... These are going on a 2.5L block. I've rounded off the sides of the chambers after widening them up. They just have a little bit of clean up at the valve seat to the port runners. Funny cause one heads casting shifts one way and the other shifts the other direction.
53cc chamber?
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Old 07-04-2011, 09:17 PM   #358
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Quote:
Originally Posted by FuJi K
Here's some chamber work... These are going on a 2.5L block. I've rounded off the sides of the chambers after widening them up. They just have a little bit of clean up at the valve seat to the port runners. Funny cause one heads casting shifts one way and the other shifts the other direction.
53cc chamber?
Casting shift is terrible on the s20 heads.
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Old 07-05-2011, 01:47 AM   #359
FuJi K
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Quote:
Originally Posted by Maxwell Power View Post
53cc chamber?
Casting shift is terrible on the s20 heads.
these are 50cc chambers. I'll work on the ones I had cc'd to 53cc later. Gotta catch up on engine builds first.

Some S20 heads are decent. They all vary.... Same with the B25's. If you bring the valve throat all the way out to almost not having a bottom cut, it'll get rid of the step.
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Old 07-06-2011, 08:14 PM   #360
FuJi K
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Quote:
Originally Posted by wrxsubiemod View Post
I been searching here and a few other areas but cannot seem to find a good answer on the topic of Reversion. Can anyone here please explain the concept to me when it comes into tearms of high performance?

I notice oem subarus do not have a step from head to exhaust manifold, but I have noticed the use of a larger ID gaskets which most companies use to gasket match the header to. I can see this causing a reversion effect. How well does the stock gasket work to control reversion when it is used with a non ported manifold? Most I've seen, tomei, gt spec still need a little porting.

Also, when heads get ported why do most people not gasket match the exhaust ports? What would be the negative and positive sides of doing this to a race engine?

Thanks in advance and sorry if I thread jacked or if this is off topic

-Ruben
Having the larger diameter after the port helps with off boost driving because you're running similar to an NA. However when boosted it doesn't do much because you are relying on the turbo to get you power. Ported stock ex-mani's makes the car drive with a bit more punch in the lesser throttle inputs aside from WOT when you're just punching it around town.




http://www.google.com/#hl=en&xhr=t&q...w=1366&bih=642
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Old 07-06-2011, 08:53 PM   #361
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put simply it helps knock down the strength of the reversion pulse from coming back into the port and to the valve. Thus it helps keep exhaust reversion and residual gas lower.
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Old 07-06-2011, 09:08 PM   #362
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Thanks fellas, I knew I could count on you guys to help.
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Old 07-22-2011, 03:24 PM   #363
FuJi K
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JDM style. Double-D width, Baby-D height.
Ported to shape, next is the exhaust work, blending, then finish up the surface texture on the intakes.
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Old 08-01-2011, 12:04 AM   #364
FuJi K
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Porting to shape is all done. Just final touches and valve seat blending, then intake port texture finish. Time to start on the 2nd head tomorrow morning.

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Old 08-28-2011, 11:24 AM   #365
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For those who didn't know....

Double D ports on this engine!
http://forums.nasioc.com/forums/show....php?t=2213041

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Old 08-29-2011, 06:57 PM   #366
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cant wait! mine are ready for some luvin'
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Old 09-07-2011, 09:34 AM   #367
FuJi K
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valve seat blending. from stock 1.17ish" to 1.23" at the troat

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Old 09-07-2011, 05:08 PM   #368
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glad to see the flat break showing itself on that floor
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Old 09-10-2011, 11:17 AM   #369
FuJi K
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Quote:
Originally Posted by Homemade WRX View Post
glad to see the flat break showing itself on that floor
a standard feature on the JDM heads.
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Old 09-11-2011, 10:19 AM   #370
FuJi K
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Old 09-11-2011, 10:38 AM   #371
FuJi K
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Old 09-14-2011, 01:40 AM   #372
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This is my first porting or any type and I just have two quick questions...

Set-up: 04 wrx Hybrid with S&R Performance 2.5L Stage 0 Built block with 2.0 Heads(Stock valves and cams)

Question 1: I have grimspeed ported headers and crosspipe and am wondering if its ok to just port/blend match around the exhaust side of the head about an inch or so in, rather than porting all the way out to the valves... I am not going for a crazy DD style port just something to help the flow. Is this going to be ok or am I making a mistake?

Question 2: On the intake side, is it ok to gasket match the head and port/blend the first inch or 2 in toward the valves?

Thanks guys!
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Old 09-14-2011, 09:11 AM   #373
FuJi K
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^^^^^
no mistake, but gains are minimal to zero. valve seat blending and widening the chamber's sides would be better.
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Old 09-14-2011, 10:50 AM   #374
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rdrz14: don't gasket match the exhaust side!! leave a stepped lip. It helps to limit reversion....something most noobs don't know to check on a flowbench or even think about with gas flow of an engine.
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Old 09-14-2011, 12:56 PM   #375
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Thanks Guys! I'll smooth things up and call it a day!
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