Carb opinions 540's 700 hp...
03-20-2015 | 08:22 PM
#141
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Joined: Oct 2013
Posts: 487
Likes: 23
From: Salisbury N.C.
Looks like a typical comparison run , I would have like to have seen the hundred numbers between 3 and 3500 . Strange to see the torque drop 16lbft , on the 950 then remain linear after that. Might
be some noise in the Dynos Data AQ at that RPM . But as you all well know , very seldom do we run at WOT under 5000 rpm unless we are Accelerating up . Most of the time we are at part throttle
and that is were the smaller venturi diameters prove superior in driveability ,throttle response and fuel usage.
be some noise in the Dynos Data AQ at that RPM . But as you all well know , very seldom do we run at WOT under 5000 rpm unless we are Accelerating up . Most of the time we are at part throttle
and that is were the smaller venturi diameters prove superior in driveability ,throttle response and fuel usage.
03-20-2015 | 09:33 PM
#142
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Generalizing, that a "dominator", has poor throttle response due to the venturi size, rich running, pigs, no low end, etc, is talk from 20 years ago. You absolutely cannot compare an old 9375 Holley Dominator, 8896, etc, to a modern dominator from quick fuel, holley, or some custom carb guys. Alot of technology has been put into them, from idle circuitry, booster design, low, mid, high speed fuel metering, and so forth.
Take one of those old ''race'' dominators, and you'll find huge power valve channel restrictors. Dominators back then, usually around .097 there. Where say a typical 750/800 carb, may be in the .040 range. So when that power valve opened on the dominator, you got a chit ton of gas. Where a normal carb, you may have got 6 jet sizes of fuel added during enrichment, you got twice that with a dominator.
The idle feed restrictors were also huge in those carbs. Spec'd for big giant race only cams that had very low idle vacuum. So, you put them on a mild cammed engine, and they were dead fat at idle, and generally sucked.
The old booster styles flowed lots of air, but didnt do much for atomizing fuel at low airspeed (low RPM). On those old dominators, they did leave alot to be desired for low speed response.
So, to sum it up, yes, those carbs left alot to be desired from a driveability standpoint. Luckily for us, its not 1990 anymore. Those giant power valve restrictions, can now be changed with a screwdriver. Those huge idle feed restrictions, also can be changed with a screw driver. We have several booster options, to suit the application, whether its a street driven mild cruiser, or an all out race engine. You can absolutely make a "dominator" user friendly, and no longer have to trade off top end power, for driveability. Whether or not Full Force would benefit from a dominator on his build, I'd leave up to the dyno or his engine builder. As far as him bolting the RIGHT dominator on, and not having a gas guzzling, plug fouling, inefficient, turd of carb, is a reality.
I can tell you, a buddy of mine built some 540's. He tried 4150's on the dyno, and the engines simply liked the 4500's. These were 700HP 540's. They went into a 30FT Vee, with #4 drives. These engines ran fantastic, throttle response was fantastic, and accelerating from 3000 to wot, would knock your dik back. The boat would shoot from 50mph to 90mph ridiculously fast.
Heres a good read on boosters and what they do, and what they affect.
http://www.hotrod.com/how-to/engine/...boosters-tech/
Take one of those old ''race'' dominators, and you'll find huge power valve channel restrictors. Dominators back then, usually around .097 there. Where say a typical 750/800 carb, may be in the .040 range. So when that power valve opened on the dominator, you got a chit ton of gas. Where a normal carb, you may have got 6 jet sizes of fuel added during enrichment, you got twice that with a dominator.
The idle feed restrictors were also huge in those carbs. Spec'd for big giant race only cams that had very low idle vacuum. So, you put them on a mild cammed engine, and they were dead fat at idle, and generally sucked.
The old booster styles flowed lots of air, but didnt do much for atomizing fuel at low airspeed (low RPM). On those old dominators, they did leave alot to be desired for low speed response.
So, to sum it up, yes, those carbs left alot to be desired from a driveability standpoint. Luckily for us, its not 1990 anymore. Those giant power valve restrictions, can now be changed with a screwdriver. Those huge idle feed restrictions, also can be changed with a screw driver. We have several booster options, to suit the application, whether its a street driven mild cruiser, or an all out race engine. You can absolutely make a "dominator" user friendly, and no longer have to trade off top end power, for driveability. Whether or not Full Force would benefit from a dominator on his build, I'd leave up to the dyno or his engine builder. As far as him bolting the RIGHT dominator on, and not having a gas guzzling, plug fouling, inefficient, turd of carb, is a reality.
I can tell you, a buddy of mine built some 540's. He tried 4150's on the dyno, and the engines simply liked the 4500's. These were 700HP 540's. They went into a 30FT Vee, with #4 drives. These engines ran fantastic, throttle response was fantastic, and accelerating from 3000 to wot, would knock your dik back. The boat would shoot from 50mph to 90mph ridiculously fast.
Heres a good read on boosters and what they do, and what they affect.
http://www.hotrod.com/how-to/engine/...boosters-tech/
03-20-2015 | 09:41 PM
#143
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Joined: Sep 2007
Posts: 120
Likes: 0
From: Clarks Summit, Pa.
Call Nickerson Performance in Bristol Pa. explain what you are running and he will set you up. I am running his carbs on 502's with fully ported merlin heads, merlin intakes and when I gave him a run down of my complete engine the carbs he sent were spot on. Idle perfect great around the dock and explosive at a push of the throttle. I have changed nothing. bolt them on and forget about it. Highly recommend them.
03-20-2015 | 11:21 PM
#144
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Joined: Oct 2007
Posts: 8,439
Likes: 93
From: yorkville,il
Generalizing, that a "dominator", has poor throttle response due to the venturi size, rich running, pigs, no low end, etc, is talk from 20 years ago. You absolutely cannot compare an old 9375 Holley Dominator, 8896, etc, to a modern dominator from quick fuel, holley, or some custom carb guys. Alot of technology has been put into them, from idle circuitry, booster design, low, mid, high speed fuel metering, and so forth.
Take one of those old ''race'' dominators, and you'll find huge power valve channel restrictors. Dominators back then, usually around .097 there. Where say a typical 750/800 carb, may be in the .040 range. So when that power valve opened on the dominator, you got a chit ton of gas. Where a normal carb, you may have got 6 jet sizes of fuel added during enrichment, you got twice that with a dominator.
The idle feed restrictors were also huge in those carbs. Spec'd for big giant race only cams that had very low idle vacuum. So, you put them on a mild cammed engine, and they were dead fat at idle, and generally sucked.
The old booster styles flowed lots of air, but didnt do much for atomizing fuel at low airspeed (low RPM). On those old dominators, they did leave alot to be desired for low speed response.
So, to sum it up, yes, those carbs left alot to be desired from a driveability standpoint. Luckily for us, its not 1990 anymore. Those giant power valve restrictions, can now be changed with a screwdriver. Those huge idle feed restrictions, also can be changed with a screw driver. We have several booster options, to suit the application, whether its a street driven mild cruiser, or an all out race engine. You can absolutely make a "dominator" user friendly, and no longer have to trade off top end power, for driveability. Whether or not Full Force would benefit from a dominator on his build, I'd leave up to the dyno or his engine builder. As far as him bolting the RIGHT dominator on, and not having a gas guzzling, plug fouling, inefficient, turd of carb, is a reality.
I can tell you, a buddy of mine built some 540's. He tried 4150's on the dyno, and the engines simply liked the 4500's. These were 700HP 540's. They went into a 30FT Vee, with #4 drives. These engines ran fantastic, throttle response was fantastic, and accelerating from 3000 to wot, would knock your dik back. The boat would shoot from 50mph to 90mph ridiculously fast.
Heres a good read on boosters and what they do, and what they affect.
http://www.hotrod.com/how-to/engine/...boosters-tech/
Take one of those old ''race'' dominators, and you'll find huge power valve channel restrictors. Dominators back then, usually around .097 there. Where say a typical 750/800 carb, may be in the .040 range. So when that power valve opened on the dominator, you got a chit ton of gas. Where a normal carb, you may have got 6 jet sizes of fuel added during enrichment, you got twice that with a dominator.
The idle feed restrictors were also huge in those carbs. Spec'd for big giant race only cams that had very low idle vacuum. So, you put them on a mild cammed engine, and they were dead fat at idle, and generally sucked.
The old booster styles flowed lots of air, but didnt do much for atomizing fuel at low airspeed (low RPM). On those old dominators, they did leave alot to be desired for low speed response.
So, to sum it up, yes, those carbs left alot to be desired from a driveability standpoint. Luckily for us, its not 1990 anymore. Those giant power valve restrictions, can now be changed with a screwdriver. Those huge idle feed restrictions, also can be changed with a screw driver. We have several booster options, to suit the application, whether its a street driven mild cruiser, or an all out race engine. You can absolutely make a "dominator" user friendly, and no longer have to trade off top end power, for driveability. Whether or not Full Force would benefit from a dominator on his build, I'd leave up to the dyno or his engine builder. As far as him bolting the RIGHT dominator on, and not having a gas guzzling, plug fouling, inefficient, turd of carb, is a reality.
I can tell you, a buddy of mine built some 540's. He tried 4150's on the dyno, and the engines simply liked the 4500's. These were 700HP 540's. They went into a 30FT Vee, with #4 drives. These engines ran fantastic, throttle response was fantastic, and accelerating from 3000 to wot, would knock your dik back. The boat would shoot from 50mph to 90mph ridiculously fast.
Heres a good read on boosters and what they do, and what they affect.
http://www.hotrod.com/how-to/engine/...boosters-tech/
03-20-2015 | 11:59 PM
#145
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
03-21-2015 | 08:55 AM
#149
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Joined: Feb 2005
Posts: 570
Likes: 47
From: cincinnati,oh.
Call BLP Products ( Bo Laws Products ) in Florida . Talk to Joe , or Mike . They have a 850 with a Dominator Base Plate. Works awesome on big CI .
These guys ( namely Bo) were building carbs for Everything from Drag Racing to Nascar and Boats , before these other guys were even born .
They manufacture all the Holley Billet Parts for Holley , they make most of the billet parts these other guys put on their carbs !
You will appreciate the smaller venturi 850 for the driveability , the Dominator is a PITA unless you are WFO. You might loose 10HP on the big end , but you wont notice unless you dyno it.
Ive seen DOMs lose power in the Mid Range , due too Low Venturi velocity and poor distribution, compared to 850-830's .
Just My .02
These guys ( namely Bo) were building carbs for Everything from Drag Racing to Nascar and Boats , before these other guys were even born .
They manufacture all the Holley Billet Parts for Holley , they make most of the billet parts these other guys put on their carbs !
You will appreciate the smaller venturi 850 for the driveability , the Dominator is a PITA unless you are WFO. You might loose 10HP on the big end , but you wont notice unless you dyno it.
Ive seen DOMs lose power in the Mid Range , due too Low Venturi velocity and poor distribution, compared to 850-830's .
Just My .02
03-21-2015 | 09:10 AM
#150
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Joined: Apr 2004
Posts: 1,268
Likes: 239
From: Michigan
