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Old 01-14-2004, 10:36 PM
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holley 600 cfm carb

how is a double pumper carb different than a regular carb, like a quadrajet? i'm thinking about swapping, but I want to make sure the advantages outweigh the disadvantages.

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Old 01-14-2004, 10:39 PM
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I'm not positive, but i believe 2 accelerator pumps which = more gas. What is it going on?
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Old 01-15-2004, 08:57 AM
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Mechanical vs. Vacuum Secondary Carburetor

A Mechanical Secondary carburetor has mechanical linkage that opens the secondary butterflys based on throttle position. That being the case there is a secondary accelerator pump circuit to add additional fuel while the engine accelerates. On a vacuum secondary carburetor there is only an accelerator pump on the primary side of the carburetor. The secondary butterflys open based on engine RPM, and load. There isn't a better or worse model, it's a matter of matching the carburetor to your specific application.
What are you working on ?
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Old 01-15-2004, 10:03 AM
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72 chevelle w/ a 350 and a mild summit performance cam. How much more gas do you think it would use?
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Old 01-15-2004, 10:20 AM
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To make an accurate determination we're going to need some more specific information. If you'll contact our technical department directly at (706) 864-8544 they should be able to help you out.
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Old 01-15-2004, 10:32 AM
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if you havent bought a carb yet ,i have a 600cfm douple pumper thats in great shape. its only about a year old and i bought it from summitracing. if you are interrested,e-mail me at robertparks1@cox.net robbie
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Old 01-16-2004, 03:09 PM
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12mpg
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Old 01-16-2004, 03:16 PM
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The general rule of thumb is........

On the street, DON'T use a double pumper.

Get yourself a 600 vacuum secondary Holley. If you think you will need more fuel, go with a 780.

You will be much happier with it, especially if you are running an automatic trans.
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Old 01-17-2004, 12:34 AM
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You will be better off with vacuum secondary on street, alot better gas milage . the other is better with big cam , gears etc.
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Old 01-17-2004, 10:30 AM
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I personally love the way a double pumper runs,most people I talk to with complaints usually ran one that was to big for their motor,they have two ways the linkage can be set up,if you run progressive,it should only dump more fuel when your dipping into the secondaries,they sure don't hesitate if they are set up right.
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