| cobragene |
01-20-2023 08:10 AM |
4150 DP 4 to 2 barrel cutoff
I have a 4779 is there a device that would allow me to cutoff the secondary’s for cruising and then hit a switch or cable to engage the secondary’s? It would seem to get better mileage and then better performance when desired. Would it even work? Or am I dreaming? Thanks
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| jhv48 |
01-20-2023 08:20 AM |
That device would be your “right foot”.
The carb can be setup so that all four barrels open at the same time. Manually open the throttle and look down the bore. If all butterflies are opening simultaneously, yours has been setup for drag racing. There is a linkage adjustment that will open only the front two bores until the throttle is depressed more than halfway. Then the back barrels open.
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| Grubby |
01-20-2023 08:36 AM |
A DP trades economy for performance. If you want economy, put on a vacuum secondary.
John
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| cobragene |
01-20-2023 09:12 AM |
Quote:
Originally Posted by jhv48
(Post 1513903)
That device would be your “right foot”.
The carb can be setup so that all four barrels open at the same time. Manually open the throttle and look down the bore. If all butterflies are opening simultaneously, yours has been setup for drag racing. There is a linkage adjustment that will open only the front two bores until the throttle is depressed more than halfway. Then the back barrels open.
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Thank you that sounds like my solution. |
| cobragene |
01-20-2023 09:29 AM |
Would that adjustment prevent the secondary’s from fully opening at WOT?
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| cobragene |
01-20-2023 09:34 AM |
Would that adjustment prevent the secondary’s from fully opening at WOT?
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| Grubby |
01-21-2023 05:36 AM |
The adjustment would just slow the opening.
Holley has a good setup description on their web page.
Double pumpers come with 3 linkages. You want the least aggressive. It can be purchased on Summit racing.
John
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| Gaz64 |
09-20-2023 05:31 PM |
If this a genuine 4779, it only has the stock 30 degrees progressive linkage.
You should have normal part throttle operation of the primaries only, with progressive operation of the secondaries.
If you can't stay out of the secondaries, for either too much power, or bad fuel economy, then replace the double pumper with a vacuum secondary carb.
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