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CC Advertisers
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12-04-2006, 12:22 PM
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CC Member
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Join Date: Apr 2004
Location: Long Beach,
CA
Cobra Make, Engine: BDR #168 427W 66+K miles and counting
Posts: 338
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Not Ranked
Thank you Don, Ron, and Excaliber, good stuff!
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12-04-2006, 03:44 PM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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Not Ranked
Keep in mind that not all mechanical secondary Holleys are double pumpers. Some are mechanical secondary, with no accelerator pump. That is why the term "double pumper" is used; to differentiate between the two mechanical types.
__________________
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
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12-04-2006, 04:22 PM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
Quote:
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Originally Posted by Power Surge
Keep in mind that not all mechanical secondary Holleys are double pumpers. Some are mechanical secondary, with no accelerator pump. That is why the term "double pumper" is used; to differentiate between the two mechanical types.
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I have never heard of a mechanical secondary carb without an accelator pump on the secondary side. Can you show me a picture of one.
__________________
"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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12-04-2006, 04:27 PM
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CC Member
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Join Date: Jun 2003
Location: Freedomia,,
Il
Cobra Make, Engine: Coupe,Blue w/white stripes SB; Roadster, Blue w/white stripes BB w/2-4s; SPF installer/Hot Rod-Custom Car builder
Posts: 1,376
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Not Ranked
Quote:
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Originally Posted by Anthony
I have never heard of a mechanical secondary carb without an accelator pump on the secondary side. Can you show me a picture of one.
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I would have to agree. They did make conversions back in the late 60s and early 70s, that I installed for a few people, it basically piggybacked the front nozzle with a longer set that fed through holes you would drill in the air horn. It used a gear drive to the secondary plate. But I don't recall them ever being offered by Holley on a carb. If they did, it was dropped when the double pumper came out.
__________________
WDZ
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12-04-2006, 04:42 PM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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Not Ranked
Quote:
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Originally Posted by Anthony
I have never heard of a mechanical secondary carb without an accelator pump on the secondary side. Can you show me a picture of one.
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Got a Jegs or Summit catalog? They're in there. Look for the mechanical Holleys with no secondary metering blocks.
Edit: Here's a pic...
__________________
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
Last edited by Power Surge; 12-04-2006 at 04:48 PM..
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12-04-2006, 04:48 PM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
Quote:
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Originally Posted by Power Surge
Got a Jegs or Summit catalog? They're in there. Look for the mechanical Holleys with no secondary metering blocks.
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I have looked through many catalogs over the last 20 years, as well as at car swap meets, and all of the double pumpers I have seen have had secondary metering blocks. Now, some of the vacuum secondary carbs have secondary metering plates, and some have metering blocks, but I have not seen any double pumpers with a metering plate.
I think an accelator pump, at least with a holley, reqiures the use of a metering block, whether it's the primary or seconndary.
__________________
"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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12-04-2006, 04:52 PM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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Not Ranked
Quote:
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Originally Posted by Anthony
I have looked through many catalogs over the last 20 years, as well as at car swap meets, and all of the double pumpers I have seen have had secondary metering blocks. Now, some of the vacuum secondary carbs have secondary metering plates, and some have metering blocks, but I have not seen any double pumpers with a metering plate.
I think an accelator pump, at least with a holley, reqiures the use of a metering block, whether it's the primary or seconndary.
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That's because it's not a double pumper (isn't that what I said??). It's a mechanical secondary carb with with no secondary pump, and no jetted metering block.
__________________
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
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12-04-2006, 04:52 PM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
Quote:
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Originally Posted by Power Surge
Got a Jegs or Summit catalog? They're in there. Look for the mechanical Holleys with no secondary metering blocks.
Edit: Here's a pic...
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I don't see an accelerator pump on the secondary.
What's the Holley list # ?
__________________
"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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12-04-2006, 04:54 PM
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CC Member
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Join Date: May 2004
Location: Palm Coast,
FL
Cobra Make, Engine: Shelby American CSX 4241 - authentically built
Posts: 2,573
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Not Ranked
Quote:
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Originally Posted by Anthony
I don't see an accelerator pump on the secondary.
What's the Holley list # ?
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Dude, are you mental or something??? 
__________________
Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241
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12-04-2006, 04:59 PM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
Quote:
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Originally Posted by Power Surge
Dude, are you mental or something??? |
Actually yes. Maybe I'll learn something here. The List # is a number that holley assigns to every model of their carburetors, and once you have that number, you can then identify the carb. I was going to look up that carb to see what its specs were.
__________________
"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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