Difference between Double Pumper & Dual Inlet - Team Camaro Tech
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post #1 of 7 (permalink) Old Jan 17th, 01, 06:34 PM Thread Starter
 
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I am confused. Please explain the difference between a Holley Double Pumper and a Dual Inlet. Also if you don't mind how can I tell the diff between a 600 and a 650. R84011/2120 is what is stamped on the carb. Thanks for the time.
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post #2 of 7 (permalink) Old Jan 17th, 01, 06:47 PM
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Double pumpers have dual accelerator pumps, numbers Id. the cfm rating.
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post #3 of 7 (permalink) Old Jan 17th, 01, 06:55 PM Thread Starter
 
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Cornholio...thanks for the reply. Can you tell from a picture if a carb is a double pumper? Are double pumpers all manual secondary? So a double inlet isn't always a double pumper? What a mess. Please reply again. Thanks
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post #4 of 7 (permalink) Old Jan 17th, 01, 07:28 PM
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R84011 Is a 4010 model carb 750cfm with vaccum secondaries. 1 11/16" throttle bores, and 1 1/2" venturis.
I'm not familliar with what type fuel bowls or other parts the 4010 series carbs have.
Try the Holley web page. http://www.holley.com/

David

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post #5 of 7 (permalink) Old Jan 18th, 01, 05:25 PM
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You are right not all duel inlet carbs are double pumpers. Double pumpers have two metering blocks,two quirters, two accelarator pumps. The vaccume seconday type will have a metering plate in the rear instead of the metering block, one quirter in front and it will also have a diaphram on the right side to open up the secondaries.

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post #6 of 7 (permalink) Old Jan 18th, 01, 05:47 PM
 
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I've read here that the 4010 and its sister carbs aren't the best for our use.

And didn't Holley quit making them if they are the Holley attempt to make a cheap top off AFB type aluminum bodied carb? pdq67



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post #7 of 7 (permalink) Old Jan 19th, 01, 03:39 AM
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My 84011 (750cfm, vs) on my 355ci drag car went 11.23 @ 120 mph. When I was driving it on the street, with an L82 cam, it went 13.00 @ 100 mph and made 18 mpg, with 3.73 gears. The 4010 series carbs have annular boosters, which help atomize the fuel, and help fuel mileage. The problem with the first generation 4010s is they had a horrible intermediate circuit. They had a lean spot just off idle. The transition to the main circuit was poor. Supposedly, they fixed this about 2 years ago. Haven't tried a newer one, so I don't know if it's any better.

They difinitely have some advantages. No fuel spillage during jet changes, and most the components are standard Holley parts (jets, power valves, accelerator pumps and cams, and needle and seat). There are some special parts, however, such as the float bowls, squirters, and gaskets.

Hope this helps. Take care.

Shane

[This message has been edited by 69SSRS (edited 01-19-2001).]
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