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05-08-2012, 11:46 PM
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#41
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Name: bbbxcursion
Title: traitor
Status: Not Here
Join Date: Apr 2008
Location: Phoenix, AZ
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Posts: 817
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Gotta watch this
__________________
2000 Excursion, 2 Swoled 400hp forged 7.3 blocks, now '05 CR.
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05-09-2012, 06:51 AM
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#42
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Name: Hurley
Title: BLAKLUNG
Status: Not Here
Join Date: Apr 2008
Location: Statesville, NC
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Posts: 3,698
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Quote:
Originally Posted by lenahan05
just because air is under pressure doesnt mean its going to act any different...just means its going to act faster. if it scavenges at atmospheric pressure why wont it at 50 times that? if you could, explain how/why you think it will act different?
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yes, it will act differently....
....and 50x atmospheric is 735psig, so it would probably burst at that pressure [/sarcasm]
my explaination...I'm no expert, so if I'm wrong, someone call me out...at atmospheric pressure on the outlet of a header, there is x amount of scavenging available; as the outlet pressure is increased (the case of a turbo/higher restriction), scavenging decreases because the ability for a low-pressure area to form behind each exhaust pulse is diminished. It is conceivable that at certain operating conditions at very low pressure there may be some scavenging present in this manifold, but as drive pressure (and boost) builds, it goes away.
And as I have said before, I like the manifold.
__________________
THIS
IS
COMPD.
95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989
03 RCLB 4x4, SSR
Last edited by Hurley; 05-09-2012 at 06:52 AM.
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05-09-2012, 07:38 AM
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#43
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Name: 97rada
Title: Too Much Time
Status: Not Here
Join Date: Feb 2008
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Posts: 5,410
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You might have a small point. It may change under high pressure. Although big company's ( cummins) teach you that there is scavenging. They have whole presentations that are devoted to how the manifold works. I am with steed on this
__________________
Austin
tow truck- 14-3500 with tuning
toy truck -94 rclb auto- 5.2x with a lot left. Shooting for 4s
Any intelligent fool can make things bigger and more complex...it takes a touch of genius- and alot of courage to move in the opposite direction.
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05-09-2012, 08:22 AM
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#44
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Name: JasonCzerak
Title: Too Much Time
Status: Not Here
Join Date: Aug 2006
Location: Bella Vista, AR
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Posts: 14,822
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I like it. I'll buy one later this summer for the next turbo(s) upgrade.
__________________
2014 Mercedes Benz E63s - 620awhp
2006 Corvette - 1000whp-ish
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05-09-2012, 08:22 AM
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#45
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Name: ComnRailPwr
Title: Too Much Time
Status: Not Here
Join Date: Jun 2009
Location: Stoutsville , OH
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Posts: 3,293
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Quote:
Originally Posted by Hurley
yes, it will act differently....
....and 50x atmospheric is 735psig, so it would probably burst at that pressure [/sarcasm]
my explaination...I'm no expert, so if I'm wrong, someone call me out...at atmospheric pressure on the outlet of a header, there is x amount of scavenging available; as the outlet pressure is increased (the case of a turbo/higher restriction), scavenging decreases because the ability for a low-pressure area to form behind each exhaust pulse is diminished. It is conceivable that at certain operating conditions at very low pressure there may be some scavenging present in this manifold, but as drive pressure (and boost) builds, it goes away.
And as I have said before, I like the manifold.
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You have to look at the big picture. Scavenging is irrelevant to drive pressure when its equal across the board. Basically since drive pressure is equal on all ports then the cyl fires it creates a scavenging effect on the neighboring cylinders due to velocity. It is not creating a vacuum in the other cylinders @ our running drive pressures but I see it lowering the drive pressure in those port runners.
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05-09-2012, 01:46 PM
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#46
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Name: kala
Title: Rookie
Status: Not Here
Join Date: Mar 2010
Location: Estonia (europe)
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Posts: 21
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It looks nice
I want this manifold T4 and wastegate
Maybe someone can help me to send this Estonia?
__________________
97´dodge ram 2500 12V 63/68 0.88 t4/ steedspeed/8,3 tuned pump/ 0.14sdx/ 4" ex.system/18* timing/HD valve springs/O-ringed block/suncoast TC/banks twinram intake/0# plate/50mm wastegate
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05-09-2012, 08:51 PM
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#47
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Name: lenahan05
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2009
Location: Terre Haute, Indiana
Member`s Gallery
Posts: 1,173
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Quote:
Originally Posted by Hurley
yes, it will act differently....
....and 50x atmospheric is 735psig, so it would probably burst at that pressure [/sarcasm]
my explaination...I'm no expert, so if I'm wrong, someone call me out...at atmospheric pressure on the outlet of a header, there is x amount of scavenging available; as the outlet pressure is increased (the case of a turbo/higher restriction), scavenging decreases because the ability for a low-pressure area to form behind each exhaust pulse is diminished. It is conceivable that at certain operating conditions at very low pressure there may be some scavenging present in this manifold, but as drive pressure (and boost) builds, it goes away.
And as I have said before, I like the manifold.
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When the exhaust valve cracks at blowdown, the spent gases and heat DO NOT slow down as they exit the cylinder. they keep a constant speed throughout at atmospheric pressure and gain speed as boost/cylinder pressure raises. it's a proven fact. if they did, scavenging would never occur. and your statement of (drive pressure and boost) in the same sentence is like comparing budweiser to keystone.....were talking about scavenging. not camshaft overlap. just trying to understand where all this bad internet info comes from. i've come to believe that the internet is bad news for learning in most cases. learn from the guys that are getting it done in competition. the manifold looks good steed. ill be putting in a few more orders like i have in the past. keep up the good work and turning out nice products for guys like me to buy/sell/compete with.
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05-09-2012, 09:33 PM
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#48
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Name: Joesixpack
Title: Pull'n it.
Status: Not Here
Join Date: Apr 2008
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Posts: 4,118
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Quote:
Originally Posted by lenahan05
When the exhaust valve cracks at blowdown, the spent gases and heat DO NOT slow down as they exit the cylinder. they keep a constant speed throughout at atmospheric pressure and gain speed as boost/cylinder pressure raises. it's a proven fact. if they did, scavenging would never occur. and your statement of (drive pressure and boost) in the same sentence is like comparing budweiser to keystone.....were talking about scavenging. not camshaft overlap. just trying to understand where all this bad internet info comes from. i've come to believe that the internet is bad news for learning in most cases. learn from the guys that are getting it done in competition. the manifold looks good steed. ill be putting in a few more orders like i have in the past. keep up the good work and turning out nice products for guys like me to buy/sell/compete with.
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What in the Phuck are you talking about?
__________________
Basically stock if I would have built it at the factory.....
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05-09-2012, 09:53 PM
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#49
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Name: lenahan05
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2009
Location: Terre Haute, Indiana
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Posts: 1,173
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Quote:
Originally Posted by Joesixpack
What in the Phuck are you talking about?
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exhaust gas speed at atmospheric pressure, it doesnt slow down. when you add boost-you add cylinder pressure, inturn-adding drive and exhaust port air velocity. read it. then go back and read it again....you'll get it sooner or later. MAYBE...... that word ''Phuck" doesnt make you sound that cool....JUST SAYIN.
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05-09-2012, 10:02 PM
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#50
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Name: Joesixpack
Title: Pull'n it.
Status: Not Here
Join Date: Apr 2008
Member`s Gallery
Posts: 4,118
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Quote:
Originally Posted by lenahan05
exhaust gas speed at atmospheric pressure, it doesnt slow down. when you add boost-you add cylinder pressure, inturn-adding drive and exhaust port air velocity. read it. then go back and read it again....you'll get it sooner or later. MAYBE...... that word ''Phuck" doesnt make you sound that cool....JUST SAYIN.
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You dip chit, the exhaust sees the turbine nozzle before atmosphere and hence why you see many of us talking about back pressure.
Your whole paragraph is garbage the same stuff your *****ing about. Your "Phucking" up my Internet.
__________________
Basically stock if I would have built it at the factory.....
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05-09-2012, 10:07 PM
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#51
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Name: YOUNG GUNS15
Title: Im AWESOME!!!!
Status: Not Here
Join Date: Sep 2009
Location: Utah
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Posts: 7,346
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Holy fawk how about we all just buy one and see if it works???
__________________
Spence
-1994 4x4 12 valve 13mm, single 475 748/1292 Fuel 872/1470 N2O
-2005 4x4 12 valve CCSB 3rd gen '12-rail' 280hp
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05-09-2012, 10:08 PM
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#52
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Name: Hurley
Title: BLAKLUNG
Status: Not Here
Join Date: Apr 2008
Location: Statesville, NC
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Posts: 3,698
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I think clarification needs to be obtained on the actual mechanics of exhaust gas scavenging, and then we can compare that to the mechanics of pulse tuning/cadence and energy transfer to the turbine wheel of a turbo.
__________________
THIS
IS
COMPD.
95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989
03 RCLB 4x4, SSR
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05-09-2012, 10:25 PM
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#53
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Name: Dockboy
Title: Comps BFF
Status: Not Here
Join Date: Apr 2006
Member`s Gallery
Posts: 3,341
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Quote:
Originally Posted by Hurley
I think clarification needs to be obtained on the actual mechanics of exhaust gas scavenging, and then we can compare that to the mechanics of pulse tuning/cadence and energy transfer to the turbine wheel of a turbo.
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No need for that...
He has a leaf blower and cardboard
__________________
Greg
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05-09-2012, 10:27 PM
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#54
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Name: lenahan05
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2009
Location: Terre Haute, Indiana
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Posts: 1,173
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[QUOTE=Joesixpack;1779315]You dip chit, the exhaust sees the turbine nozzle before atmosphere and hence why you see many of us talking about back pressure. QUOTE]
REALLY? guess i forgot about that. its hard talking to and pleasing the internet diesel gods.
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05-09-2012, 10:29 PM
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#55
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Name: lenahan05
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2009
Location: Terre Haute, Indiana
Member`s Gallery
Posts: 1,173
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Quote:
Originally Posted by YOUNG GUNS15
Holy fawk how about we all just buy one and see if it works???
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thats the best information ive read in this thread. heard that man! the rest of this info is for the birds.
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05-09-2012, 10:32 PM
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#56
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Name: zenzen_427
Title: Scuba Steve
Status: Not Here
Join Date: Feb 2010
Location: Fort Collins
Member`s Gallery
Posts: 155
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I'm getting one stat! (give me a week or two Taylor)
__________________
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05-09-2012, 10:34 PM
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#57
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Name: TheBigNasty
Title: Project bish
Status: Not Here
Join Date: May 2007
Location: Magnolia, TX
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Posts: 5,385
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I think the effective use of Bernoulli's principle has less to do with system pressure and more with flow. It may not produce an area of vacuum, but could definitely produce an area of lower pressure.
I could also see it becoming a completely moot point when you have excessive drive pressures.
Oh, and the "tested by leaf blower and cardboard" has to be the worst bit of marketing ever produced.
__________________
Brandon
2012 Ford F250 King Ranch
2004 Dodge 2500 Sport
Last edited by TheBigNasty; 05-09-2012 at 10:41 PM.
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05-09-2012, 10:40 PM
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#58
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Name: bsmith
Title: Never enough
Status: Not Here
Join Date: Jul 2008
Location: la
Member`s Gallery
Posts: 3,966
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Quote:
Originally Posted by kala
It looks nice
I want this manifold T4 and wastegate
Maybe someone can help me to send this Estonia?
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Steed won't ship to you? Ill help if I can.
__________________
RIP DEX
2001 2500 2wd
Diesel pro's cam
Walbro 392
Goff diesel injection
160hp pump
6x.013's by Weston
HTT 62/71/13 over FI 82/92/1.10
Levi's turbo blankets!
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05-09-2012, 10:42 PM
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#59
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Name: TMONEYDIESEL
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2007
Member`s Gallery
Posts: 8,706
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Quote:
Originally Posted by zenzen_427
I'm getting one stat! (give me a week or two Taylor)
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Youll like it!
__________________
MANNING MOTORSPORTS
Office +1 (512) 217-7644
YOUR SOURCE FOR:
Camshafts
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05-09-2012, 10:57 PM
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#60
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Name: zenzen_427
Title: Scuba Steve
Status: Not Here
Join Date: Feb 2010
Location: Fort Collins
Member`s Gallery
Posts: 155
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Quote:
Originally Posted by TMONEYDIESEL
Youll like it!
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Is this a time to look into a t4 platform or will t3 be alright for my needs/goals (cool 700hp+ hotrod)
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