holley carb flat spot off idle

JavaScript is disabled. Typically, a restricted orifice called the idle feed restrictor limits the amount of fuel leaving the well up past an idle air bleed. Thanks for the advice. Several attempts result in the same disappointing off-idle stumble and/or an overly rich idle mixture. Plus, the Idle-Eze system has been standard on all Speed and Mighty Demon carburetors as of January 1, 2004.

That is why they are jetted a bit low compared to the others. sec. Read More, We head to Lake Tahoe, California to find out if Ram’s new Raptor fighter has what it takes to dethrone the king of off-road pickups.

I am posting this so that someone might avoid the week of headaches I had trying to get rid of an off idle stumble on my '64 Galaxie. This slot is exposed to manifold vacuum as soon as the throttle is opened. So what's the fix?

It's pretty easy once you grasp the function of the various circuits. That's a fair amount of cam for a 355,I like 16 or so degrees initial, think the total is close.

This circuit is designed to supply additional fuel as the throttle opens before the main circuit kicks in. Hmmmm, my 3310-2 has had a 25 squirters since I got it...16 years ago.....it LOVES the 31 in the new 800DP. All the 3310's use 72 front jets, the 70's alone may give you that stumble. stock nozzle is a 31, i guess i will have to go get a pair of 72 jets and see what happens. Once you have checked things like float level, transition opening, pump adjustment and such; you shouldn't need to touch them again. Your AFR gauge will also work for this... you could just jump up to the next size and see if that corrects your issue. Could be very rich at the top end. Log in, DAVID VIZARD’S HOW TO SUPER TUNE AND MODIFY HOLLEY CARBURETORS, Drag Racing Traction: Suggestions for a More Consistent and Winning Car, How to Design and Install a Turbocharger System: Step-by-Step Guide, Blueprinting Engines: Valve, Springs, Retainers, Locks, Ford Muscle Cars Handling and Performance Upgrades, Automotive Bodywork: Repairing Collision Damage in a Decklid, Engine Tuning: How to Improve Drivability, Abandoned Dragstrips: Chattanooga Hotspots.

Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Lean transition circuit is more likely. RPM heads, RPM intake, FiTech EFI, Comp XE266HR roller cam, EDIS/Megajolt ignition, long headers), T5Z w/Steeda TriAx shifter, 9" Trac Loc w/3.89:1, 31 spline axles. To me, it sounds like your power valve isn't giving the bump the engine needs in fuel. The first test of a quick fix, after ensuring accelerator pump was functioning properly, was to increase the hot idle speed.


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