Re: Spray bar valve cover
[Re: challenger1320]
#2653671
05/09/19 11:37 AM
05/09/19 11:37 AM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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This set of Jesel rockers have no oil holes for the rocker tips or axles They came with the heads along with the spray bar covers, the ratio on the box says there 1.55 ratio I hope to race the motor this weekend at our local 1/8 mile track with out the spray bar covers do to no provision for the vacuum pump fittings, yet I'll look at the rockers and valve springs after the first day and decide if I will run it the second day
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Spray bar valve cover
[Re: Stanton]
#2653800
05/09/19 06:58 PM
05/09/19 06:58 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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So if the pressure in is 50 psi in a .028 in3 line (3/16" ID), the pressure does NOT drop between the first and second set of holes? How about if the first hole is .028"? The line after that has the same pressure as the hole, and equal to 50% of the line in. The delivery rate is a function of the hole area X the square root of the pressure differential.
Boffin Emeritus
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Re: Spray bar valve cover
[Re: polyspheric]
#2653819
05/09/19 07:39 PM
05/09/19 07:39 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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So if the pressure in is 50 psi in a .028 in3 line (3/16" ID), the pressure does NOT drop between the first and second set of holes? How about if the first hole is .028"? The line after that has the same pressure as the hole, and equal to 50% of the line in. The delivery rate is a function of the hole area X the square root of the pressure differential. I think you misunderstand what's being said here - although (my bad) I did leave out the word "combined" thinking people would be smart enough to assume that!: " the "combined" area of the holes is equal to or smaller than the feed line they will all squirt the same amount (or pretty damn close to it)."
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Re: Spray bar valve cover
[Re: Stanton]
#2653835
05/09/19 08:37 PM
05/09/19 08:37 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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You didn't understand what I wrote. Hydraulic engineering (Archimedes) figured this out 2 millennia ago in designing aqueducts.
Boffin Emeritus
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Re: Spray bar valve cover
[Re: polyspheric]
#2653861
05/09/19 10:34 PM
05/09/19 10:34 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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You didn't understand what I wrote. Hydraulic engineering (Archimedes) figured this out 2 millennia ago in designing aqueducts. Ok smarty-pants .... just tell him what size to drill the friggin holes !!
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Re: Spray bar valve cover
[Re: Stanton]
#2653886
05/10/19 12:10 AM
05/10/19 12:10 AM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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Equal hydraulic pressure at all points only occurs in a closed system without leaks.
Boffin Emeritus
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Re: Spray bar valve cover
[Re: polyspheric]
#2653913
05/10/19 06:55 AM
05/10/19 06:55 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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I remember reading a comment that in a dead-end system (line enters cover at one end) most of the oil will go to the closest valve, and that to balance out the delivery the closest holes should be smallest, but how much? My Indy valve covers were fitted with spray bars for the Jesel rockers. Oil lines were fed into the center of the valve cover. Helps eliminate end to end pressure drop and bleed off.
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Re: Spray bar valve cover
[Re: polyspheric]
#2653955
05/10/19 09:46 AM
05/10/19 09:46 AM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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Equal hydraulic pressure at all points only occurs in a closed system without leaks. So when you plumb an oil pressure gauge in at the rear of the block, what its really telling you is the first main bearing is getting ridiculously high pressure and the last lifter in the left bank is getting virtually none
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Re: Spray bar valve cover
[Re: Stanton]
#2654137
05/10/19 07:41 PM
05/10/19 07:41 PM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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Equal hydraulic pressure at all points only occurs in a closed system without leaks. So when you plumb an oil pressure gauge in at the rear of the block, what its really telling you is the first main bearing is getting ridiculously high pressure and the last lifter in the left bank is getting virtually none Take a look at the heating duct work in a warehouse. You will notice how the duct diameters get smaller towards the end of the run. That keeps the airflow up when exiting the vents. Liquid works the same way.
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Re: Spray bar valve cover
[Re: sgcuda]
#2654166
05/10/19 09:13 PM
05/10/19 09:13 PM
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Joined: Feb 2009
Posts: 345 Arkansas
JoWeTu_6
OP
enthusiast
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OP
enthusiast
Joined: Feb 2009
Posts: 345
Arkansas
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Seems to me the pressure drop inside the valve cover if any would be insignificant in such a short distance. I'm just saying.
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Re: Spray bar valve cover
[Re: sgcuda]
#2654168
05/10/19 09:15 PM
05/10/19 09:15 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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Take a look at the heating duct work in a warehouse. You will notice how the duct diameters get smaller towards the end of the run. That keeps the airflow up when exiting the vents. Liquid works the same way. My lawn sprinkler system has the same size line feeding the whole system. The last sprinkler sprays just as far as the first.
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Re: Spray bar valve cover
[Re: Stanton]
#2654169
05/10/19 09:16 PM
05/10/19 09:16 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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Seems to me the pressure drop inside the valve cover if any would be insignificant in such a short distance. shruggy I'm just saying. Agreed
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Re: Spray bar valve cover
[Re: Stanton]
#2654191
05/10/19 10:28 PM
05/10/19 10:28 PM
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Joined: May 2003
Posts: 6,621 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,621
Downtown Roebuck Ont
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Take a look at the heating duct work in a warehouse. You will notice how the duct diameters get smaller towards the end of the run. That keeps the airflow up when exiting the vents. Liquid works the same way. My lawn sprinkler system has the same size line feeding the whole system. The last sprinkler sprays just as far as the first. And the holes are microscopic by comparison. Kevin
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