Dual Quads??
Racer
Joined: Jan 2006
Posts: 458
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Originally Posted by kb2fzq
Here's my 2 cents...I have a dual Edelbrock setup...but nothing (I'm finding out) under it to make it go (I will adress that in another thread)....YES, it looks very, VERY COOL 
...but I am deciding on swapping for a single quad...MPG (GPM 
)?...it's a hog, the guys all smile at the pump when they see me coming..fast?...NO, at least not what I would expect anyway....but you sound like you have what it takes under the intake to make it work...for looks, you can't beat 'em...and when you open them both up, the sound is intoxicating... 
...but I am deciding on swapping for a single quad...MPG (GPM )?...it's a hog, the guys all smile at the pump when they see me coming..fast?...NO, at least not what I would expect anyway....but you sound like you have what it takes under the intake to make it work...for looks, you can't beat 'em...and when you open them both up, the sound is intoxicating...
Racer
Joined: Jan 2006
Posts: 458
Likes: 0
Originally Posted by 2th farmer
I am debating replacing the airgap/holley 750 with this Edelbrock dual quad set-up. The carb./intake came with the car when I traded for it last Summer. It is sitting on the shelf collecting dust. I either need to put it on this build or sell it. Anybody have opinions?? I know it would LOOK great but how will it perform on a 454 built roller engine street cruiser?? [IMG]
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Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Gainesville GA
There are pros & Cons to dual quad applications.
The biggest pro is going to be the look. It's not something people see everyday, so if you're showing the car it will get you some attention.
Cons: More to tune (not a bad thing for some, for some it is) The biggest down side is the drivability is not going to be as good as it would be with a good single 4bl. The single 4bl will have better air velocity so it will give better responsiveness. Another down side to a dual quad setup is that there can be distrabution problems if you spend a lot of time a part throttle.
The biggest pro is going to be the look. It's not something people see everyday, so if you're showing the car it will get you some attention.
Cons: More to tune (not a bad thing for some, for some it is) The biggest down side is the drivability is not going to be as good as it would be with a good single 4bl. The single 4bl will have better air velocity so it will give better responsiveness. Another down side to a dual quad setup is that there can be distrabution problems if you spend a lot of time a part throttle.
Safety Car
Joined: Jan 2001
Posts: 3,637
Likes: 27
From: Norwalk Ct
I say go for it.........best thing I ever did was go to the Barry Grant six shooter on mine....better throttle response, better performance and one hell of a sound at WOT and it looks cool (Compared to the 650 dp and Edelbrock rpm intake I ha don it before) 
Nick
Nick
Instructor
Joined: Dec 2004
Posts: 124
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From: Gainesville GA
The Six-Shooter 3x2 system will have some advantages over a dual quad setup. Since you're normally driving on the center 2bl carburetor you'll get better throttle response, acceleration, and you can usually get better fuel economy. Also since it uses a dual plenum intake manifold the center carburetor will feed the outer cylinders so you won't run into distrabution problems.
Racer
Joined: Jan 2006
Posts: 458
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Originally Posted by Doug S
The Six-Shooter 3x2 system will have some advantages over a dual quad setup. Since you're normally driving on the center 2bl carburetor you'll get better throttle response, acceleration, and you can usually get better fuel economy. Also since it uses a dual plenum intake manifold the center carburetor will feed the outer cylinders so you won't run into distrabution problems.
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Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I do see the part about distribution, never thought about that before. If you are cruising at part throttle I can see the fuel has a futher to travel to some cylinders and that could create problems for throttle response and tuning as some cylinders will be leaner than others
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Gainesville GA
Originally Posted by MotorHead
I do see the part about distribution, never thought about that before. If you are cruising at part throttle I can see the fuel has a futher to travel to some cylinders and that could create problems for throttle response and tuning as some cylinders will be leaner than others
Especially if you use the Edelbrock stagered linkage!
Thread Starter
Melting Slicks
Joined: Nov 2004
Posts: 2,540
Likes: 1
From: Pineville Kentucky
CI 6-8-9 Veteran
Went to the parts store today and picked up a new intake gasket so I guess the quads are on the way. The linkage is SCARY looking though! Thanks for the input, keep it coming.
Burning Brakes
Joined: Aug 2005
Posts: 1,126
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From: Hudson Falls, N.Y. 76 Vette Modified L-48
Originally Posted by Doug S
Especially if you use the Edelbrock stagered linkage!
If you were to set up the linkage to run the 2 quads simultaniously, would that help the fuel distribution....or just empty the gas tank quicker?
Basically speaking, what is the correct linkage setup for dual quads, progressive or simultanious??
Last edited by kb2fzq; Mar 5, 2006 at 06:23 AM.
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Gainesville GA
Originally Posted by kb2fzq
Stagered linkage, I assume you mean what I call progressive linkage...one carb at idle and gradually activating the second (and first) carb as the peddle goes down?
If you were to set up the linkage to run the 2 quads simultaniously, would that help the fuel distribution....or just empty the gas tank quicker?
Basically speaking, what is the correct linkage setup for dual quads, progressive or simultanious??
If you were to set up the linkage to run the 2 quads simultaniously, would that help the fuel distribution....or just empty the gas tank quicker?
Basically speaking, what is the correct linkage setup for dual quads, progressive or simultanious??
Personally I wouldn't run a dual 4bl setup on something that I was looking at driving for those reasons. The problem with their progressvie linkage is you start by opening the front of one carburetor, and then later the front 2bl of the other carburetor REALLY bad distrabution. Although not a big fan of using Vacuum Secondary carburetors on dual 4bl applications, I'd use a pair of vacuum secondary carburetors, and open up the primary barrels on both carburetors at the same time, then bringing in the rear butterflies based on air speed by tuning the spring rates. That's why if I were to run multiple carbs on a street engine I'd use a Six-Shooter 3x2 setup. http://www.barrygrant.com/news/artic...oduct_004.aspx
Race Director
Joined: Feb 1999
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From: In Dreams There Is Truth Ohio
Last edited by GDaina; Mar 5, 2006 at 11:56 AM.
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Gainesville GA
Originally Posted by GDaina
Those are beautiful!
Personally I think the Demon's Look better though. Either way I after playing with them I prefer the mechanical linkage on the Demons rather than the vacuum outer carbs. Makes tuning much easier if you're working on a modified engine.
Racer
Joined: Jan 2006
Posts: 458
Likes: 0
Originally Posted by kb2fzq
Stagered linkage, I assume you mean what I call progressive linkage...one carb at idle and gradually activating the second (and first) carb as the peddle goes down?
If you were to set up the linkage to run the 2 quads simultaniously, would that help the fuel distribution....or just empty the gas tank quicker?
Basically speaking, what is the correct linkage setup for dual quads, progressive or simultanious??
If you were to set up the linkage to run the 2 quads simultaniously, would that help the fuel distribution....or just empty the gas tank quicker?
Basically speaking, what is the correct linkage setup for dual quads, progressive or simultanious??
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Gainesville GA
Originally Posted by ESC3
I ran my old setup simultaniously.I had the carbs jetted up to match the airflow.Set my base timing at 14 degrees at 900 rpm and total at 36degrees at 3800rpm.The Edelbrocks don't use as much fuel as a Holley or Demon so I was still getting good mileage,and the timing setup the way it was the car would leap out of the hole.
What kind of MPG where you getting?