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holley carb flat spot off idle

sec. you could try raising the float, that would could make a small difference overall. I have the stumble from a dead start and at low speed cruising. 83 Capri RS T-Top 302, Afr 195 Renegade,11.2 compression, e303 cam, Scorpion 1.82 race series rockers, TFS-R, X3Z w/Tweecer RT, T56 Magnum, 2 1/2" Pypes X pipe w/2 chamber Flowmaster mufflers. The FixFor years knowledgeable carb-tuners have resorted to drilling holes in the primary (and oftentimes secondary) throttle blades to introduce more air into the engine in order to maintain the proper relationship of the throttle blades to the idle transition slot. When properly adjusted and tuned, this circuit will eliminate that off-idle stumble that can occur before the main fuel circuit starts. Just ordered some 70’s and I’ll report back how it goes. Start the engine and turn one of the idle screws in or out. Idle-Eze throttle plate assm., 850 vac. Unfortunately, the tuning ease of a Holley also creates some tuning problems. I went to 64's because of the altitude here. We used it on a 4779 Holley used on a 331" road racing motor and it worked very well. I would be tempted to bump the initial to 16 and take a couple out of the mechanical along with a bigger squirter. Does it have the correct metering blocks? Hey guys, im trying to get my carb dialed in have have a slight problem. There is a theory that I proved wrong many years ago, that says to use smaller jets and a bigger power valve. You are actually 8 more than stock. Have you checked the plugs after a wide open run? Idle-Eze throttle plate assm., 650/750-cfm, mech. Transition Slot Usage Make sure the accelerator pump is tight and squirts with any throttle movement. Did you put the check ball back in the secondary housing? 70 Maverick Grabber, 5.0 (Perf. For now, Grant has adapted the Idle-Eze idea on new throttle plates available for most of the larger Demon carburetors. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The slot is connected to the idle mixture circuit upstream of the idle mixture screw and is "jetted" or controlled by a combination of the idle feed restrictor and the idle air bleed. They're numbered according to the vacuum point at which they open. stock nozzle is a 31, i guess i will have to go get a pair of 72 jets and see what happens. jet change wont wont fix it. Did you check/clean the filter already??? Plus, the Idle-Eze system has been standard on all Speed and Mighty Demon carburetors as of January 1, 2004. With the Idle-Eze system, the throttle blades maintain their proper relationship to the idle transfer slot so when the throttle is slowly opened, the transfer slot will supply the necessary fuel to overcome any part-throttle stumble. JavaScript is disabled. Usually lugging through a parkinglot in 2nd gear or just cresting a slight hill in 4th letting out. Regardless if you have a two- or four-corner idle adjustment on your QFT™ carb, start by setting all of the idle adjustment screws the same (1-1/4 turns from bottomed out in the metering block is a good place to start). The power valve is what is supposed to give you a bump in fuel under light acceleration. Off-idle flat spot/bog is one symptom of insufficient fuel to support the amount of air you're letting in with the throttle. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. The answer is amazingly simple. Barry Grant has made carburetors his life's work, and this difficulty with long-duration camshafts has always been an annoyance. A forum community dedicated to Ford Mustang owners and enthusiasts. that could cause it to run fat at idle. The best way to solve it on most carbs is to remove the carb. If the carb is clean and in good condition and the engine has enough timing in it you could try putting smaller idle air bleeds in it, that would richen up the transition and get rid of the flat spot. You drop it in gear, tip in the throttle, and the engine dies. Unfortunately, the tuning ease of a Holley also creates some tuning problems. It'll do what it wants too". Read More. Holley has been the undisputed leader in fuel systems for over 100 years. Just pull over in a parking lot and make adjustments and test till it doesn't hesitate. Well if I should have had 71's in it like Kelly suggested, I am only 3 jet sizes over. do you have the throttle blades drilled? But by doing so, you're now using fuel supplied by the transition slot. To modify an existing carburetor, all you have to do is disassemble the main body and baseplate and drill a hole through the carb stud hole, and you're ready to reassemble the carb. I have battled those myself and ended up switching carbs. This only happens with very light throttle cruising. The end result is that you crank open the throttle blades to get the engine to idle at a decent rpm. 64s are 600 primary territory. Idle BasicsAll carburetors come with a simple yet efficient idle circuit. Yes go back to the 70's and try it then. Thanks for the advice. First off, i know this is quite a common problem with the holley carbs, and and i have searched it at length and tried most of the suggestions that i have come across with no results. That's a fair amount of cam for a 355,I like 16 or so degrees initial, think the total is close. Wow, who would of thunk that? Try a 31 and go to 72 jets. If the carb is not equipped with replaceable jets, insert a fine piece of fuse wire (with a bend in it so it does not go all the way into the idle well) to block off some of the air going into the air corrector jet. This slot is exposed to manifold vacuum as soon as the throttle is opened. A couple in any direction from stock is normal, sometimes more in the back for racing. Get a good vacuum gauge and see what vacuum you're getting. Read More, Over the course of just seven months, this ’67 Dodge Dart was transformed from a lively cruiser into a street and strip restomod that shows just as well as it goes. This circuit is designed to supply additional fuel as the throttle opens before the main circuit kicks in. While I had the carburetor off I checked the accelerator pump squirters and noticed the front was a number 31 and the back was a number 35. Try 72 jets first, they are the stock set.

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