How much fuel pressure does a Holley double pumper need?
FUEL PRESSURE: This carburetor has been designed to work best at fuel pressures between 5 and 7 psi. Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline.
How do I choose a Holley jet?
How to Calculate Jet Sizes for a Holley Carb
- Establish the elevation and temperature the carburetor will be operating within.
- Establish the current jet size of the jets within the Holley carburetor. Adjust the jets one size for every 2,000 foot change in elevation or for every 35 degree change in temperature.
What psi should my carburetor be?
Fuel pressure should be set between 6 and 8 psi for a gasoline carburetor. An alcohol carburetor is a different animal with very different requirements. The Alky carburetor will require 4 to 5 psi at idle and 9 to 12 psi at wide open throttle. Remember, fuel pressure is not a substitute for volume!
What is a 750 Double Pumper Holley carburetor?
A 750 double pumper Holley carburetor is a high performance carburetor that incorporates two accelerator pumps that are manually operated. Used for high performance or larger displacement engines, they are infinitely tunable.
How many CFM does a Holley Double Pumper have?
750 CFM Classic Double Pumper Carburetor w/ Electric Choke Holley upgraded their two most popular sizes of double pumper with electric chokes. The 650 and 750 CFM models are available in the classic zinc and shiny polished finishes. Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles.
How many CAMS does a Holley pump have?
Holley offers a pump cam assortment kit with a total of eight different cams – seven that are different from the stock white cam used on the primary side of most Holley carburetors. These cams offer options relative to the amount of pump lift per degree of throttle opening.
Do all Holley carburetors have an accelerator pump?
We should also take this time to mention that all Holley carburetors use an accelerator pump on the primary side, but vacuum secondary four-barrel carburetors do not employ a pump on the secondary side. “Double pumper” or mechanical secondary carbs employ an accelerator pump on both the primary and secondary sides.
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