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04-26-2011, 10:35 PM | #26 |
Former Vendor
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Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Yeah and I was really thinking we'd see 300 CFM in the proper direction but it's this weird valve job that seems to have muffed the flow. It's for my own parts hauler so I've been trying to convince myself that somehow the improved fuel atomization will somehow trump airflow. The "twirl" turbulence should rival that of a "fast burn" GM 185 runner SBC. I'm still convinced with a symmetrical 45* into radius VJ, light unshroud & backcut the overall flow in the right direction would've been more impressive from an airflow standpoint.
Here are the flow numbers pre-weirdo valve job, low and mid-lift are outright awesome. Code:
Lift Intake Flow Dogleg Exhaust Straight Exhaust .050 58 31 37 .100 103 68 72 .150 156 108 113 .200 214 147 160 .250 249 176 196 .300 268 193 222 .350 280 201 235 .400 280 204 245 .450 281 206 246 .500 281 - -
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05-07-2011, 12:35 AM | #27 |
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01-12-2012, 08:56 PM | #28 |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Training a new porter...
Had him try his hand at mimicking a big port EJ207 on junk D25 casting. EJ255 D25 Junk Casting ASF Ported & Polished SF-110 7" H2O corrected to 28" No valve or chamber work. Code:
Lift Intake Flow Exhaust not tested yet. .050 47 - .100 93 - .150 148 - .200 191 - .250 237 - .300 262 - .350 276 - .400 283 - .450 289 - .500 289 - |
01-12-2012, 10:51 PM | #29 |
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Again, you guys are GREAT for posting this stuff up! and I hate to be "That guy" but where is the EJ205 info? I only ask because I was considering machinging a set of 205 heads to match the 2.5 block but picked up a set of 255 heads instead, so I was wondering what the difference in flow would be.
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01-17-2012, 05:42 PM | #30 |
Former Vendor
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Patience young padowan.
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01-17-2012, 11:35 PM | #31 |
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01-18-2012, 01:17 AM | #32 | |
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01-18-2012, 05:02 PM | #33 |
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Its great that you posted the flow of both exhaust ports.
Would it be too much to ask for the numbers on the single port 2.2 heads? I always wonder if they have terrible flow even though the single port 2.2 had higher peak HP than the dual port 2.2 |
02-06-2012, 10:01 PM | #34 |
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What is the difference in a EJ251 head, both styles of EJ253's and the EJ254 heads?
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02-06-2012, 10:17 PM | #35 | |
Former Vendor
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Quote:
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04-12-2012, 02:23 PM | #36 |
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maybe this is the right place to ask. I'm planing on picking up a cheap used na 2.5 from a 96 or 98 legacy to temporarily replace the avcs heads i have for my wrx. i was hoping they would be close enough to use as normal 02 wrx heads while I build/fix the heads I have now. any info would help alot.
I'm running a ej207 that came from a jdm twin turbo legacy so I'm not even sure that they match any of the usdm STI heads. on cobb 16g map. just need them to work in the short term while building second motor...... |
04-12-2012, 03:02 PM | #37 |
Former Vendor
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Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Phase I heads will not work in your situation.
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04-12-2012, 04:33 PM | #38 | |||
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Quote:
Quote:
Look at the SOHC flow bench number and tell me why they repeatedly fail to make huge power? It's strange for sure but this is why real world testing and dyno work just can't be replaced by flow bench numbers. My 2c. LOL! Phil Grabow |
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04-12-2012, 09:15 PM | #39 | |
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someone must of over done them. we where referring to too large killing velocity. If it isn't as big as a JDM big port, you can't say it too big. A S2000 had sports larger intake ports than us. The exhaust ports, there isn't much room to play with. I know, I play with them all the time; B25, D25, S20. Seen V25B, W25... |
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05-22-2012, 07:21 PM | #40 | |
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Hey Guys,
Does anyone have flowbench results of the Dual AVCS heads, i want to compare against my ported setup to see if there is any significant difference between a stock Dual AVCS head setup and mine below? Quote:
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05-23-2012, 03:13 AM | #41 | |
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What's the average CSA of the intake on these heads ASF? S. |
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07-15-2012, 09:24 AM | #42 |
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am i missing something but does it seem that the NA heads flow quite well?
Was thinking of changing my ej253 sohcs to ej205 dohc to get more flow, but seems that i might aswell just out some better cams in my sohc heads that will cope with the turbo better. Am i right in saying that?? |
07-15-2012, 10:00 AM | #43 |
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Single cam heads work well for being single cam.
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07-29-2012, 04:16 PM | #44 |
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Vehicle:2007 STi Limited #339 UGM -SOLD |
EJ257 V25B ('07 STi casting)
Stock valves - refaced and back-cut Valve Job (Newen EPOC), bowl blend, smoothed STR (short turn radius) on int + exh, lowered intake floor .020" - nothing else No chamber work SF-1020 28" H2O 95.5mm aluminum bore fixture - o-ring sealed top and bottom Plastic intake entry, no pipe on exhaust All work done by myself Exhaust Exhaust Exhaust Intake Intake Intake Both + valves The bench *these heads might soon be for sale - pm me if interested* EDIT: They are now for sale here http://forums.nasioc.com/forums/show....php?t=2407476 Last edited by BallPeenHamr; 09-14-2012 at 09:51 AM. |
07-29-2012, 04:39 PM | #45 |
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What can the EJ205s be opened up to? Kind of looking at stuff, and wondering if it's feasible to get them out to flowing similarly to 207 heads or if it's not even worth the trouble.
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07-30-2012, 02:10 AM | #46 | |
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09-16-2014, 01:44 AM | #47 |
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Bumping this to the top any new info on the 205 heads
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05-18-2015, 04:58 PM | #48 |
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For those buying STI heads, you may want to look into the Z20 heads from the legacy as they might flow somewhere between the 257 and 207, and probably cheaper
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08-23-2015, 05:05 PM | #49 |
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these questions could be answered somewhere [ i have spent a good time looking ] but as with the bore size , i have a question with regards to troth size , on std valves size are you increasing it if so how much [ some might not like to say by how much ] we usually get to open them by 1mm on std valves on other brand engines / and this is where i wonder does everyone increase troth size when using bigger valves or are new bigger seats or keeping std troth to increase venturi ,
i seen someone rote that the newer std heads are flowing near b16a head figures , this is a point where i see subaru lacking as these cfm figures obivouslly flow perfectlly adiquatlly for 16-1800cc and the increase in subaru cc only increase the restriction and therfore the hugh fall off in what we see the graphs , cam are really only an attempt to sort the issue has anyone got a set of cams cut to suit the head they have flowed Cheers |
02-21-2019, 04:57 PM | #50 |
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I know this is ancient, but based on your flow test data is there any reason an EJ251 couldn't make, say, 650hp?
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