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Re: What do your heads flow?
[Re: bwhackd34]
#1259386
07/17/12 10:41 PM
07/17/12 10:41 PM
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Joined: Jan 2003
Posts: 14,504
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,504
So. Burlington, Vt.
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Quote:
Let me also reiterate that while my bench is calibrated to flow 592cfm in range 6 that is to do so at 25"....if I were deliberately trying to mislead I would base my calculations off of that info....AT THE VERY LEAST...and not bother with the .997 correction factor for flow capacity when flowing at 28".....while not a lot it would gain me some 'flow' but if the numbers aren't genuine I really don't see the point....in the past I had even posted some results that seemed positive BEFORE I verified as I was a bit happy to have them....only to realize why, at that time the gain occurred, and once that issue was corrected and the results proven not actual I deleted that post....I have since ACTUALLY gotten to that point and maybe even a but more but at that time the post was not accurate and was therefore immediately removed....
i'm not going to get into a debate on what your heads could or couldnt flow.
if i had one on my bench....whatever that number was would be what they flowed as far as i was concerned.
i do have one question though about your .997 correction factor and how you're applying it.
are you flowing at 25" and correcting to 28", or are you flowing at 28"?
the reason i ask is, the correction factor from 25" to 28" isnt .997(which i'm sure you know), so i'm just wondering where it fits into the equation.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: What do your heads flow?
[Re: fast68plymouth]
#1259387
07/17/12 10:48 PM
07/17/12 10:48 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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My Stage V big valve heads fully CNC ported flow +500.
Don't have the exact # because I don't have the charts yet.
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Re: What do your heads flow?
[Re: fast68plymouth]
#1259388
07/17/12 11:10 PM
07/17/12 11:10 PM
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Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Int. @ .100 .200 .300 .400 .500 .600 .700 c.f.m. 76 157 234 295 334 349 348 Exh. c.f.m. 59 124 186 225 243 250 253 W-9's ported with a conservative approach and an eye towards mid lift flow #'s. I think they'll work O.K. The whole motor is a series of compromises since it was built with stuff that was available and affordable over a couple - three year window. It should have a bigger bore ( it's 4.125 " ), but that could change in the future. It could sure stand more cam ( 260 / 250 @ .050 and .668 lift ) , and it might like a bigger carb too. But the time slip will be the final arbiter here. This is the first time I have had a set of heads done up for me , but this is also the most motor I have ever attempted to screw together too......I didn't trust myself to home port them and had too much $$ on the table to risk messing them up. I think I'll be happy with the end result. If not , there is always a plan "B". 
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Re: What do your heads flow?
[Re: bwhackd34]
#1259389
07/18/12 12:29 AM
07/18/12 12:29 AM
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Joined: Oct 2011
Posts: 559
Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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Quote:
And if in fact no one else on the planet can get these numbers then I have accomplished exactly what I set out to do two years ago...
Yep, I understand.
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Re: What do your heads flow?
[Re: LaRoy Engines]
#1259390
07/18/12 12:58 AM
07/18/12 12:58 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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W-9.. CNC ported then touched up... 365 at .700... small lift and to big of duration cam and small bores but it is what it is... it doesnt break anything 
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Re: What do your heads flow?
[Re: fishy340]
#1259391
07/18/12 01:29 AM
07/18/12 01:29 AM
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Joined: Jan 2003
Posts: 19,369
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,369
Las Vegas
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Well FWIW my B1MC's top out at 452-457cfm, on three different benches over the years. The 99's are at 590 at 1.000". The -1's for the street car are at 370. All of these are hand ported heads no CNC stuff. B1's by Mike Duke,99's by Schumacher racing then Mike Duke.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: What do your heads flow?
[Re: bwhackd34]
#1259393
07/18/12 07:12 PM
07/18/12 07:12 PM
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Joined: Oct 2004
Posts: 1,752
detroit area
moderncylinder
top fuel
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top fuel
Joined: Oct 2004
Posts: 1,752
detroit area
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Quote:
This has been a subject of other posts on here but I am working on a w9 port design that right now flows upwards of 445@.850" and very near 470@1.00. Velocity down the port is near 325-335 and about 260ish through the throat....port volume around 300cc....still a work in process...
when you stated this,,,,, and then saying 95-96% throat respective to valve size,,, though you never said what your valve size cause its top secret,, but assuming 2.250-2.300,, implys an mca of 2.8-3.0
really its just simple math,, unless what you have stated is incorrect
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Re: What do your heads flow?
[Re: moderncylinder]
#1259394
07/18/12 08:44 PM
07/18/12 08:44 PM
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Joined: May 2012
Posts: 617
PA
bwhackd34
mopar
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mopar
Joined: May 2012
Posts: 617
PA
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Quote:
Quote:
This has been a subject of other posts on here but I am working on a w9 port design that right now flows upwards of [Email]445@.850"[/Email] and very near [Email]470@1.00.[/Email] Velocity down the port is near 325-335 and about 260ish through the throat....port volume around 300cc....still a work in process...
when you stated this,,,,, and then saying 95-96% throat respective to valve size,,, though you never said what your valve size cause its top secret,, but assuming 2.250-2.300,, implys an mca of 2.8-3.0
Not following your math....if you are figuring the throat as the MCA then assuming a 2.25 valve its area would be 3.974...with a 95% throat the gross area would be 3.775 less valve stem area of .0923(assuming an 11/32 valve) for a net area at the throat of 3.683....if you are figuring the MCA to be elsewhere down the port it could be any size irrespective of these dimensions.....working backward.....with a flow of 450 and an MCA of 3.00 calculated velocity would be 357fps....
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Re: What do your heads flow?
[Re: bwhackd34]
#1259397
07/18/12 09:12 PM
07/18/12 09:12 PM
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Joined: Oct 2004
Posts: 1,752
detroit area
moderncylinder
top fuel
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top fuel
Joined: Oct 2004
Posts: 1,752
detroit area
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260/330=.787878
.787878 x 3.683 = 2.90
now thats in general,,, but if you have velocities at those two points,,, and have area at one of those points,, you can "guess" at what the area is at the other
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