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Nov 16, 2000 · Good question about hole #1 vs. hole #2. Here's my best guess: Hole #1 with the idle set so the throttle plates are either closed or in a "normal" relationship to the off-idle discharge slots (.050" showing, very close to fully closed), while still allowing the usual .015" of residual travel in the pump arm at WOT. Notice th
Nov 19, 2019 · Holley offers a broad range of sizes of accelerator pump nozzles. This is a 31 – note the hollow screw that can be used anywhere but is important with nozzles larger than 0.040-inch. Most street carburetors will operate with nozzle sizes ranging from 0.028 to 0.037-inch.
Holley recommends the No. 1 position for idle speeds below 900 rpm and suggests moving to the No. 2 position for engines that idle above 900 to 1,000 rpm. Here’s a simple tip that can save tons of effort. Make sure the accelerator pump linkage moves the arm to the diaphragm as soon as the throttle is moved.
Apr 23, 2015 · 1208 posts · Joined 2007. #5 · Apr 23, 2015. To me Holleys instructions are confusing. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly.
Dec 2, 2009 · Accelerator Pump Cam Selection And Installation On Holley Carbs. Bill Tichenor. 12/02/2009. 10 min read. Share. Carburetor Installation and Tuning. Support Video. Video. Accelerator pump cams on Holley carbs can be swapped out to deliver advanced or delayed accelerator pump delivery depending on your engine's normal idle speed.
Nov 7, 2015 · Discussing the Holley accelerator Pump Set-up and tuning. you should fully understand how to adjust your accelerator pump after this video. i use a wideband ...
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Jul 5, 2012 · Start by increasing the fuel nozzle size up by three sizes. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holley's hollow pump nozzle accelerator screw. This allows maximum fuel to flow through the nozzle.
