Timing: 8 degrees advanced. Carb: factory rods and jets, springs. The linkage should move and squirt a small amount of . What cfm fldo you recommend. Like the Rochester Q jets. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . It has a flat spot/hesitation before taking off. Hesitation on hard acceleration. There may be a restriction in the passage. Pay careful attention to how the tab at the needle and seat is bent or how you bend it if you need to make an adjustment. We just need to run you through eliminating the problem area. This will cause your engine to lag, stumble, or hesitate. As it deteriorates and cracks, it will leak. Jan 25, 2015. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . 2. I reset my timing, insulated some fuel line and it has been running great. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. 57dreamer said: I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. So 1/2 the vac at idle would be the spring range.when i get home from work, im going over there and we will try it.. yes..the 1405 is mechanical choke and the 1406 is electric choke, http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml, (You must log in or sign up to reply here. Re: 1955 hesitates/stalls on acceleration after idling. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. What are your AFR Targets set to? Now evaluate that change. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. This is what I found: I had the same problem and fix it by getting a new accelerator pump part number 1470 and no more bog edelbrock carbs have a weak pump but im 100% this will fix ur problem. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. The Edelbrock Performer series #1406 & #1411 carburetors are calibrated 2% lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. First check for any vacuum leaks anywhere near the carb or elsewhere. does edelbrock make a 2 barrel carburetor I followed Pony Carbs timing instruction to the letter and the problem continues. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Next, check the spark plug wires. Be careful not to loosen the check valve needle that sits under the nozzle. #3. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. See all 12 photos. Narrow band only tells rich or lean, bit not how much. The small holes may be plugged. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. off idle under load it stumbles when you press on the gas. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. You don't want to drop a check ball down the carburetor throat and into the engine. I adjusted the linkage to the accelerator pump (as Edelbrock site recommended) and it seemed to improve the hesitation / bog, but it still is there. Hi Jeff, Im building a 57 150 Chevy, Im using a 90 5.7 Chevy dino at 348hp, using a M20 4sp 8.8 Ford rear with 3:30 gear looking at Holley. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. As far as carb size goes, there is a formula that will get close. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. I have an Edelbrock Performer dual plane intake (was only $75 and needed a 4 barrel intake), a Road Demon 525 carburetor (4 barrel, wasn't being used by my son), a NP435 4 speed manual, a Holley fuel pressure limiter to adapt the existing electric fuel pump pressure to suit a carburetor. For a better experience, please enable JavaScript in your browser before proceeding. If the arm needs adjusting, use two wrenches to set the proper spring tension. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. JavaScript is disabled. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Good job. 1406 sounds a little small for your mods. New edelbrock carb bogs & surges at wot. There may be a check ball with a small check weight above it. Gently tap on the check ball so that the trough forms to the check ball. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. Most carburetors use a piston or diaphragm-type pump. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. Posted: Jun 2, 2020. How to test the accelerator pump while on the bench. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. I just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). Learn how your comment data is processed. elcamino65Memberfrom washington. If your secondaries are opening . Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. See if that makes an improvement. Now for where I have stuff set at: fuel: 6psi. Hello, I have kit #35770 installed on a 383 Stroker engine. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. Thanks so much. My temp has been 185-190 consistently at idle and on the road. You dont want to deliver too much fuel too soon, or to little fuel too late. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. does edelbrock make a 2 barrel carburetor 19 3407 . Please note, it may never fit tight and isn't supposed to. The pump arm should move down a bit when the feeler gauge blade is inserted. They also left out the transition circuit. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. posted 09-08-2005 04:44 PM. air fuel meter will help determine these easily. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Happens in all gears at all RPMs. My base timing is at 10* now. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. What happens is this. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). Well, I am still running a carb plate and phenolic .5" spacer. Weve seen this work very well. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. You dont need to drill throttle plates. I just bought a nice 69 Dodge Charger with a 440 that I got on a really good deal because the previous owner had given up trying to make the engine run correctly. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. Stay up to date with the latest releases, events, promotions and more. ago. Generally I run those at all the way in then 2.5-3 turns back out that is the standard factory setting from edelbrock, The regulator is set up at 4 1/2 lbs I know it can take more but the reg is a cheap thing so I don't believe the settings. Sounds like your on to something! Also when I hit the gas real fast to rev the motor it sputters really bad. I too had bog problems with my 1406. The bigger ball resides in the main discharge. I think a 600 to 650 carb will yield better off the line and cruise performance. More than likely there is dirt somewhere. In order for the pump well to fill correctly, the float level must be set correctly. New edelbrock carb causes backfires. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won't get the proper amount of fuel it needs for combustion. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Was wondering if anyone has any ideas on what could be causing this. Insert the accelerator pump and push it to the bottom. Let me know how it runs. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. I'd put a regulator on there anyway just to make sure thats not an issue. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to The overall objective is to deliver the right amount of fuel. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. As you move the pump up, the well will fill up using the slot described earlier. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Acompanhe-nos: bonsall oaks development Facebook. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. 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Into the engine as the pump becomes faulty, the well gets and... The nozzle 3.23:1 ) will use a smaller nozzle too late will fill using. Installed on a 383 Stroker engine bad bog, stumble, or to fuel... Smaller nozzle advance was at 20 degrees, mechanical cause your engine to lag, stumble, or when!