Holley Dominator Boosters
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From: All humans are vermin in the eyes of Guru VA
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From: All humans are vermin in the eyes of Guru VA
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So follow me here a sec. If the rear secondaries are opening earlier at opening slower. How about running a rear power valve and the soft progressive linkage. At part throttle the main secondary jets would manage the fuel flow, but if I mash the throttle the power valve opens and allows the fuel through.
Just thinking out loud. A soft linkage device is about 25 bucks.
Just thinking out loud. A soft linkage device is about 25 bucks.
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From: All humans are vermin in the eyes of Guru VA
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On hood height:
An ecklers high rise hood has 4.625" clearence at this point of measurement
As you can see my bar clamp is roughly 4" from rail. So the tallest hood I can get from a catalog gives me 4.625" and the L88 hood gives me 4.125" clearence.
As you can see from this picture I have 1.875" additional clearence to the top of the bar:
A couple of other measured dimensions.
My edelbrock performer 600 is 3.375" tall by my measurement
My holley Dominator is 3.25" tall. (The safety plate will take up the extra difference in carb height so it is a wash)
So realisitically with my dominator carb and a flat bottom intake with a 2" filter can(there is no drop base for a 14" aircleaner on a dominator) would be around the same height off of the carb flange as this set up.
I can use 4.2+1.875 = 6" manifold height
So with an L88 hood I am restricted to a 6" tall manifold, and with the high rise hood I could use a 6.5" manifold. (leaving around .125 fudge factor)
So at a minimum I would have to use the ecklers high rise hood to clear the intake, carb, and air cleaner.
An ecklers high rise hood has 4.625" clearence at this point of measurement
As you can see my bar clamp is roughly 4" from rail. So the tallest hood I can get from a catalog gives me 4.625" and the L88 hood gives me 4.125" clearence.
As you can see from this picture I have 1.875" additional clearence to the top of the bar:
A couple of other measured dimensions.
My edelbrock performer 600 is 3.375" tall by my measurement
My holley Dominator is 3.25" tall. (The safety plate will take up the extra difference in carb height so it is a wash)
So realisitically with my dominator carb and a flat bottom intake with a 2" filter can(there is no drop base for a 14" aircleaner on a dominator) would be around the same height off of the carb flange as this set up.
I can use 4.2+1.875 = 6" manifold height
So with an L88 hood I am restricted to a 6" tall manifold, and with the high rise hood I could use a 6.5" manifold. (leaving around .125 fudge factor)
So at a minimum I would have to use the ecklers high rise hood to clear the intake, carb, and air cleaner.
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They used to call it the *super soft* linkage. It's the slowest opening one available. That's what I put in mine. It keeps them closed until you need them.
The rear section of mine if basically stock. No PV...big jets. Typically 82/95 jetting plus pri PV.
JIM
The rear section of mine if basically stock. No PV...big jets. Typically 82/95 jetting plus pri PV.
JIM
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From: All humans are vermin in the eyes of Guru VA
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So I took apart my metering blocks. Very interesting. No PVCRs. That is definitely a problem.
So I think I am going to have to get a pair of billet metering blocks from AED or quick fuel. Though the picture of the quick fuel billet block as no provision for a power valve.
Or I can get my holley 750 and disassemble that bad boy and figure out the 2 circuit conversion. TIme to take it apart.
check out the difference!
So I think I am going to have to get a pair of billet metering blocks from AED or quick fuel. Though the picture of the quick fuel billet block as no provision for a power valve.
Or I can get my holley 750 and disassemble that bad boy and figure out the 2 circuit conversion. TIme to take it apart.
check out the difference!
Last edited by Guru_4_hire; Oct 22, 2008 at 07:52 PM.
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Just look at the holes in the 750 an drill some in the 1050. No need for a new metering block. Just follow the passageways all the way through.
JIM
JIM
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From: All humans are vermin in the eyes of Guru VA
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Spending a quick minute with the gaskets and different metering blocks. It appears the only real passage difference I can tell is that it reorders the airbleeds. and so 4 holes in the mainbody aren't used.
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From: All humans are vermin in the eyes of Guru VA
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I think I am going to have to buy an ear irrigator and dribble water through various circuits in the main body and determine where they go. Since other people have made this work I shouldnt be too far off. Just need to make sure I am blocking off the right circuit.
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From: All humans are vermin in the eyes of Guru VA
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So I traced some holes in the main body.
Here is what I found:
The hole marked T is the transition circuit, the hole marked I is the Idle circuit, the 3rd is the intermediate circuit.
Up at the top are the High speed air bleed, the idle air bleed and the unused airbleed(x'ed out)
Now in a regular dominator carb the air bleed I have labeled IAB would typically be the intermediate airbleed and the x'ed out airbleed would traditionally be the idle airbleed.
In the next picutre you will see how a 4150 gasket lines up to the dominator mainbody
As you can see it lines up perfectly absent the dominator intermediate circuit, and the above airbleed order changes.
Here is what I found:
The hole marked T is the transition circuit, the hole marked I is the Idle circuit, the 3rd is the intermediate circuit.
Up at the top are the High speed air bleed, the idle air bleed and the unused airbleed(x'ed out)
Now in a regular dominator carb the air bleed I have labeled IAB would typically be the intermediate airbleed and the x'ed out airbleed would traditionally be the idle airbleed.
In the next picutre you will see how a 4150 gasket lines up to the dominator mainbody
As you can see it lines up perfectly absent the dominator intermediate circuit, and the above airbleed order changes.
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From: All humans are vermin in the eyes of Guru VA
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So there are 3 sets of annular boosters:
Holley 34-34 - Dominator HP Annular boosters
Holley 34-9 - Old style Annular boosters
And
34-36 - THis is a specially designed booster to restrict the carb down to 750cfm.
Holley 34-34 - Dominator HP Annular boosters
Holley 34-9 - Old style Annular boosters
And
34-36 - THis is a specially designed booster to restrict the carb down to 750cfm.
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From: All humans are vermin in the eyes of Guru VA
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So here is the pressure drop across a couple of common venturis:
http://www.ajdesigner.com/venturi/ve...fferential.php
(all based upon 180cfm flow and a density of 1.16Kg/m^3)
Holley 650: 4043 Pascal
Holley 750: 2334 Pascal
Dominator: 1090 Pascal
So lets look at what this means: I need a booster that will provide 3.71 times the gain as a holley stick booster, and/or 2.14 times the gain as a holley down leg booster.
Not quite sure how to figure that out.
Lets look at Jim's old 427 we basically keep the same values in the calculator and adjust the CFM to 216 from 180 and the pressure change would be 1569 Pascal.
Lets look at his 540 and up the CFM to 273 and we get 2504 Pascal, which is a little better than a 350 with a 750cfm carb on it.
http://www.ajdesigner.com/venturi/ve...fferential.php
(all based upon 180cfm flow and a density of 1.16Kg/m^3)
Holley 650: 4043 Pascal
Holley 750: 2334 Pascal
Dominator: 1090 Pascal
So lets look at what this means: I need a booster that will provide 3.71 times the gain as a holley stick booster, and/or 2.14 times the gain as a holley down leg booster.
Not quite sure how to figure that out.
Lets look at Jim's old 427 we basically keep the same values in the calculator and adjust the CFM to 216 from 180 and the pressure change would be 1569 Pascal.
Lets look at his 540 and up the CFM to 273 and we get 2504 Pascal, which is a little better than a 350 with a 750cfm carb on it.
Last edited by Guru_4_hire; Oct 23, 2008 at 07:17 PM.
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From: All humans are vermin in the eyes of Guru VA
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So I guess-t-mate that the pressure drop across my holley 750 booster is 22557 Pascal with 37 CFM going through the booster
I guess-t-mate that the pressure drop across my Dominator booster is something like 11918 with 48cfm going through the booster
This leads me to believe that my dominator booster needs to have its typical .875" outside diameter with a .4375" interior.
That is of course if I was comparing apples to apples.
I guess-t-mate that the pressure drop across my Dominator booster is something like 11918 with 48cfm going through the booster
This leads me to believe that my dominator booster needs to have its typical .875" outside diameter with a .4375" interior.
That is of course if I was comparing apples to apples.
Last edited by Guru_4_hire; Oct 23, 2008 at 07:19 PM.
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So I was thinkin on my drive in. Bernoullis principle operates on 2 pressures 2 areas flow and the density of the fluid.
So this got me thinking. I know the pressure change at the venturi, I can calculate the pressure change I want at the booster, and I know the area of the booster OD. So I should be able to calculate the ID of the venturi based upon that information.
If that works I need a venturi inside diameter of .445
So this got me thinking. I know the pressure change at the venturi, I can calculate the pressure change I want at the booster, and I know the area of the booster OD. So I should be able to calculate the ID of the venturi based upon that information.
If that works I need a venturi inside diameter of .445
Last edited by Guru_4_hire; Oct 24, 2008 at 09:05 AM.
