|
|
|
|
Thread Tools | Display Modes |
|
08-06-2010, 04:04 PM | #1 |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Subaru Cylinder Head Flow Database
I thought I'd start a thread for cylinder head flow numbers, feel free to add to it. Please include mods, flow depression and any other pertinent info.
Disclaimer: I don't drive a train or have an engineering degree, I am simply an engine machinist who enjoys Subies trying to share some info with the community. Disclaimer 2: Flow CFM is only part of the cylinder head equation but knowing these numbers aid some us greatly when modeling combinations. (I know Subies don't ever get .50" lift but I like to go there just to see "what if") What Head: Valves & Size of Valves: Port Work: Chamber Work: Type or Model of Bench: Flow Depression: Notes: *All intakes done with clay radius stack on intake.* *No pipe on the exhaust* *4" Polycarbonate bore fixture* JDM EJ207 Big Port AVCS RHS20V Casting Stock Valves Stock Ports Stock Chambers SF-110 7" H2O corrected to 28" Mighty Impressed by "as cast" heads, especially mid lift from .250" to .350". Code:
Lift Intake Flow Exhaust Flow Non-Dogleg Port .050 44 31 .100 86 67 .150 142 114 .200 178 150 .250 232 156 .300 262 178 .350 281 188 .400 283 191 .450 283 194 .500 283 197 Stock Valves Stock Ports Stock Chambers SF-110 7" H2O corrected to 28" Somewhat disappointed as people often tout these as super-awesome. Code:
Lift Intake Flow Exhaust Flow Non-Dogleg Port .050 30 31 .100 87 69 .150 138 103 .200 179 132 .250 214 152 .300 241 165 .350 245 177 .400 249 185 .450 249 193 .500 251 194 Stock Valves Stock Ports Stock Chambers SF-110 7" H2O corrected to 28" Cleanest factory casting I've ever seen. Surprised as many folks on the forums discount these heads as inferior to anything DOHC. I haven't flow tested the exhaust yet. Code:
Lift Intake Flow .050 48 .100 84 .150 143 .200 188 .250 222 .300 239 .350 253 .400 253 .450 260 .500 264 Stock Valves Port Matched to TGV (yep empty TGVs on a SOHC) + full ASF port & polish Polished chambers SF-110 7" H2O corrected to 28" 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 - - Last edited by ASF Machine; 04-26-2011 at 08:07 PM. Reason: added info |
08-06-2010, 04:33 PM | #2 |
Scooby Specialist
Member#: 184324
Join Date: Jul 2008
Chapter/Region:
RMIC
Location: Colorado
Vehicle:1999 Impreza 2.5RS Black |
Interesting finds! I've long been a fan of SOHC heads, albeit mostly because its much easier to change plugs while the engine is in the car. Good to know that they flow well! Curious as to how much they flow when they have been ported...
|
08-06-2010, 05:25 PM | #3 |
Scooby Guru
Member#: 832
Join Date: Jan 2000
Chapter/Region:
RMIC
Location: Teh Ghetto Garage, CO
Vehicle:99 2.5RS, '85 911 '73 914 and 2012 BRZ |
http://www.chrracingproducts.com/flow-test-data
If you click the flow test date button for Subaru on this site, those are my heads listed. SOHC heads really open up nicely on the exhaust side. You can go further than they did on my heads, but my car is NA with a hopped up street cam and we didn't want to kill the port velocity and low end. My redline is only 6400 rpm. For different applications like a high revving race motor or FI you could port them more. |
08-13-2010, 11:52 PM | #4 |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
More...
JDM EJ207 Big Port AVCS RHS20V Casting
+1mm Supertech Valves with radius into tangent valve job ASF Ported & Polished with minimal port volume increases (yay for velocity!) Chambers deshrouded to 99.5 Bore, Valves deshrouded individually SF-110 7" H2O corrected to 28" Notes: Noticeable gains at higher lift, extraordinary low to mid lift; I cannot wait to see the power under the curve on this build. Customer's knowledge and planning on this build are unparalleled. Code:
Lift Intake Flow Exhaust Flow Non-Dogleg Port .050 49 37 .100 98 78 .150 151 121 .200 199 165 .250 237 196 .300 272 210 .350 291 216 .400 297 217 .450 301 217 .500 302 219 Last edited by ASF Machine; 10-28-2010 at 06:38 PM. |
08-14-2010, 03:57 AM | #5 |
Scooby Newbie
Member#: 212677
Join Date: May 2009
Chapter/Region:
NWIC
Location: King County East, WA
Vehicle:1999 Forester S Bone stock...for now |
Here are mine:
JDM Version 4 EJ20K Stock Valves Hand Ported and Polished Chambers Deshrouded & Polished Stock cams and valvetrain with shim under bucket follower setup 5 angle into radius valve job, decked to clean SF-110 28" H2O Code:
Lift Intake Flow Exhaust Flow Non-Dogleg Port .050 42 35 .100 89 70 .150 140 115 .200 188 150 .250 226 167 .300 257 180 .350 264 191 .400 264 197 .450 268 201 .500 276 203 |
08-14-2010, 04:23 AM | #6 |
Scooby Newbie
Member#: 252934
Join Date: Jul 2010
Location: Island Gaol
Vehicle:99 |
JDM V7 STI
Tony Knight Race Engines, Adelaide Australia. Chambers modified by JHH, Brisbane Australia. Stud bores and oiling opened up by me. Ferrera catalogue, manganese guides etc. CNC profile and hand finished. Chambers to suit 100mm custom CP's Kelford 264's etc Drilled to suit 12.7mm head studs with sleeved stud bores to limit distortion. You get the drill. They flow better than Cosworth big port heads do at all points of lift @ 28in. (Cosworth figures are a joke, at 28in of water they flow terribly compared to these, nearly 17cfm lower at 400thou.) Flow testing was done on an SF600 superflow bench The bench has been calibrated with tractorsport orifice plates Tested at 28" depression Inlet/Exhaust Ratio Lift 0.100 0.200 0.300 0.400 0.500 Ratio Ported 86.0 86.2 82.0 81.6 78.4 Code:
Lift Intake Flow Exhaust Flow Straight Exhaust Dogleg .100 98 84.5 84 .200 195 169 167 .300 281 232 229 .400 315 258 256 .500 335 263 262 |
08-14-2010, 06:06 AM | #7 |
Scooby Newbie
Member#: 252934
Join Date: Jul 2010
Location: Island Gaol
Vehicle:99 |
This 'yay for velocity' stuff is a bit of a laugh. We're talking subaru head castings here, you cant physically go to big. Its just impossible.
|
08-14-2010, 11:37 AM | #8 | |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Yes, Cosworth uses a bench at 50" H2O. It produces super inflated flow numbers but to their credit it also better at uncovering flow deficiencies than the standard 28". To convert depressions Take the dep. you want to convert to / your dep. and fin that number's square root. Example 50/28=1.7857 That square root of that is 1.3363, now multiply this against your old flow numbers at 28" H2O.
Quote:
|
|
08-16-2010, 12:26 AM | #9 |
Scooby Guru
Member#: 3687
Join Date: Jan 2001
Chapter/Region:
MWSOC
Location: St. Paul, MN
Vehicle:MY99 GF4 JDM 6spd NF Performance |
|
08-16-2010, 11:17 AM | #10 |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
|
08-16-2010, 11:01 PM | #11 | |
Scooby Guru
Member#: 3687
Join Date: Jan 2001
Chapter/Region:
MWSOC
Location: St. Paul, MN
Vehicle:MY99 GF4 JDM 6spd NF Performance |
Quote:
but here we go for data's sake. STOCK B25 STi head Code:
Lift Intake Straight Dogleg .100 81 84 78 .200 166 166 155 .300 231 188 174 .400 248 195 178 What Head: '06 EJ257 Valves & Size of Valves: SuperTech +1mm Port Work: Double-D intake and enlarged exhausts Chamber Work: Stock Type or Model of Bench: SuperFlow600 Flow Depression: 28" Notes: 5angle valve job with seat blending. Clayed intake and 2" dia x 3" length exhaust pipe clayed on. Removed valve guide and supports. Intake ports 3mm larger port runners. http://forums.nasioc.com/forums/show...&postcount=166 Code:
Lift Intake Straight Dogleg .100 87 88 88 .200 177 183 186 .300 262 235 227 .400 294 247 235 What Head: '04 EJ257 Valves & Size of Valves: Stock Port Work: Baby-D intake and enlarged exhausts Chamber Work: Stock Type or Model of Bench: SuperFlow600 Flow Depression: 28" Notes: stock valve angles with seat blending. Clayed intake and 2" dia x 3" length exhaust pipe clayed on. Removed valve guide and supports. Intake ports 1mm larger port runners. http://forums.nasioc.com/forums/show...&postcount=195 Code:
Lift Intake Straight Dogleg .100 86 78 81 .200 170 159 159 .300 241 217 210 .400 267 239 228 What Head: '06 EJ255 Valves & Size of Valves: Stock Port Work: STOCK Chamber Work: Stock Type or Model of Bench: SuperFlow600 Flow Depression: 28" Notes: Clayed intake and 2" dia x 3" length exhaust pipe clayed on. http://forums.nasioc.com/forums/show...81&postcount=1 Code:
Lift Intake Straight Dogleg .100 86 72 72 .200 177 145 142 .300 237 185 180 .400 253 203 192 http://forums.nasioc.com/forums/show....php?t=1728481 http://forums.nasioc.com/forums/showthread.php?t=903873 |
|
05-23-2012, 03:13 AM | #12 | |
Scooby Specialist
Member#: 18960
Join Date: May 2002
Chapter/Region:
South East
Location: Bama
Vehicle:02 WRX MBP It lives! ; ) |
Quote:
What's the average CSA of the intake on these heads ASF? S. |
|
08-16-2010, 12:24 AM | #13 |
Scooby Newbie
Member#: 166132
Join Date: Dec 2007
Location: Earf
Vehicle:1888 Horse Brown |
double true^
|
08-16-2010, 01:11 PM | #14 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
been there and played with a pitot using Performance Trends port flow analyzer. You'll find some good stuff for sure!
|
08-16-2010, 11:15 PM | #15 |
Scooby Specialist
Member#: 87653
Join Date: May 2005
Chapter/Region:
South East
Location: Long Island NY
Vehicle:97 Supra / 17 GTR 16 Z06 / 07 STI / 05 Evo |
I'll have mine up fairly soon, intake is over 300 cfm at .400
|
10-28-2010, 02:37 PM | #16 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
bump for a revival...
ALSO, I didn't realize this until now but everyone should really mention what bore diameter they are flowbenching on because it does make a difference. If you get into charge/discharge coefficients, you'll really notice. **I also kind of toss flowbench values from one to the other out the window as how tests are conducted can vary and that it is much like comparing dyno numbers in that each bench is calibrated and things can vary. In conducting tests, my dislike with 'claying' is the question of repeatability throughout testing, which brings about the question of what inlet do they use if they aren't claying. ASF Machine: how are you making a Superflow SF110 flow 28" at those flowrates?...isn't it only rated to like 15" H2O and like 180 or so cfm... Last edited by Homemade WRX; 10-28-2010 at 02:45 PM. |
10-28-2010, 06:43 PM | #17 |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Good point on the bore fixture.
You are correct on bench flow capacity. I've amended the above listings to show heads were physically tested at 7" and corrected to 28". I realize this is less than ideal when uncovering flow deficiencies but I am currently only doing what I know works(and many others that have come before me that are a lot smarter than I am.) |
10-29-2010, 11:40 AM | #18 | |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
Quote:
|
|
10-30-2010, 12:16 AM | #19 |
Scooby Guru
Member#: 3687
Join Date: Jan 2001
Chapter/Region:
MWSOC
Location: St. Paul, MN
Vehicle:MY99 GF4 JDM 6spd NF Performance |
I'm trying to get good flow numbers on stock valves. I can't seem to hit 300CFM with the bore size I'm using; 4". Came close with this head. Pictures are as seen in my posts somewhere in this forum.
|
11-04-2010, 08:54 PM | #20 | |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Quote:
I can usually pick up a bunch at low lift and smidge up high even on valves that have a "backcut" already on them. |
|
03-10-2011, 06:11 PM | #21 |
Scooby Newbie
Member#: 255202
Join Date: Aug 2010
Chapter/Region:
International
|
Hey Guys, Great i have been looking for a reference point like this thread.
i recently had my heads ported, but don't have much info re data points, fairly new to all the field values so please educate me on terminology regarding my table below. Pics below is all that i got from shop re flow bench test results. What Head: EJ255 heads Valves & Size of Valves: BC Springs and Retainers and 1mm oversized BC valves Port Work: Yes Chamber Work: not known Type or Model of Bench: not known Flow Depression: not known Notes: installed with Kelford 264 intake and 260 exhaust cams |
05-22-2012, 07:21 PM | #22 | |
Scooby Newbie
Member#: 255202
Join Date: Aug 2010
Chapter/Region:
International
|
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:
|
|
03-10-2011, 06:37 PM | #23 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
so you can expect a little over 270 cfm intake and about 250 cfm exhaust from that setup.
|
05-07-2011, 12:35 AM | #24 |
Scooby Newbie
Member#: 255202
Join Date: Aug 2010
Chapter/Region:
International
|
|
04-26-2011, 07:43 PM | #25 |
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
Vehicle:1993 Impreza OD Green |
Updated more SOHC weirdness to post #1.
EJ251 SOHC "Polyquad" Staggered Valve sizes Intake: 35.05mm @ 45* seat into radius & 36.05mm @ 30* seat into radius w/ 6* deshroud Exhaust: 30.5mm & 31.5mm 45* seats into radius Port Matched to TGV (yep empty TGVs on a SOHC) + asymmetrical ASF Port & Polish Polished & staggered deshrouded chambers SF-110 7" H2O corrected to 28" Comments: Intake is EXTREMELY turbulent in both directions, I was after some "twirl" to aid in ethanol atomization for better burn but this seems a bit extreme. This turbulence is what I attribute the loss of intake flow to... as an added odd note; peak flow in reverse on the intake was 306 CFM from .400-.500". I can only speculate that these heads would be a poor pairing with an NA setup & bunches of overlap, the dyno will tell us how they do with some FI goodness. Code:
Lift Intake Flow Dogleg Exhaust Straight Exhaust .050 51 31 50 .100 98 88 93 .150 143 125 129 .200 188 161 174 .250 218 183 204 .300 241 194 225 .350 253 199 230 .400 257 203 244 .450 268 205 246 .500 276 - - Last edited by ASF Machine; 04-26-2011 at 08:11 PM. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Subaru Cylinder Head Info+ Specs | cribbie | Built Motor Discussion | 7 | 11-21-2018 11:53 PM |
EJ205 heads flow? | leighton1245 | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 3 | 08-06-2010 09:34 AM |
subaru cylinder heads | TimBeeno | Private 'Wanted' Classifieds | 2 | 09-27-2007 11:45 PM |
Cylinder Head Flow Bench | nkeehn | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 1 | 03-18-2003 05:34 AM |
Air flow data - Cylinder Heads | Trey | Technical Forum Archive | 16 | 08-10-2000 11:38 AM |