Nettet28. mai 2024 · The Holley 4000 has 2 idle mixture screws. Only 1 seems to make a difference in RPM when adjusted. Most likely culprit is warpage in the “boot” on the front of the bowl casting. As the back of it lifts up with the passage of time, the idle circuits and the power valve diaphragm circuit are interrupted. Nettet19. okt. 2024 · When I fatten the mixture back out to 1 or 1.5 turns, vacuum is around 8 inHg and the engine seems to like it, but the fuel mix is very rich and smokes even worse at idle. The engine seems to like 3/4 turn on the idle circuit, but the driver doesn't like the black smoke at idle. Initial timing is set at 14° TDC at 850 RPM and 33° @ 2200 RPM.
need holley carb help (idle circuit???) - The H.A.M.B.
Nettet13. nov. 2024 · the holley's with there dead spots and off idle problems are notorious, I used to run holly's but I either run a carter afb a edelbrock or the fitech fuel injection or sniper but never a Holley again i dont know how your holley is set up but you need total adv at 36 now the carb did you pull plugs and check the burn I would bet its rich I would … Nettet17. des. 2024 · Holley addressed this issue beginning in 1992 by incorporating an anti-backfire check ball into all its carburetors. This prevents damage to the power valve … mom month on month
600-cfm Holley 1850 - Applications - Tuning - Tech - MotorTrend
Nettet5. feb. 2024 · Problems begin when engines with big camshafts create idle vacuum lower than 10 Hg. With this reduced idle vacuum, the throttle blades must be opened farther in order to allow the engine to... Nettet25. aug. 2024 · For all intents and purposes, 82751 is a 4-corner idle 750 double pumper with it's choke shroud removed, which doesn't usually change main circuit calibration much or any at all. Depending on application camshaft .050 intake duration for idle feed sizes (0.031" for stock/mild, up a thou or two or more with wilder cam), be best to … Nettet13. aug. 2014 · I've taken it apart, cleaned, and put back together with all new parts. Here is the problem: I've adjusted the primary float down all the way down (as far as you can with the adjusting nut), and removed the sight plug. The fuel level in the bowl is so low now, you cannot get fuel to slosh out even by rocking the vehicle. i am that boy