edelbrock carburetor hesitation on acceleration22 Apr edelbrock carburetor hesitation on acceleration
You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Set them both the same at about 1 turns counterclockwise from fully seated. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Now for where I have stuff set at: fuel: 6psi. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! 70 F250 Camper Spcl. Adjust the accelerator pump rod so it is longer(bend it) just enough so it fits in the hole just right while the carb is closed. . Hesitation on hard acceleration. Thats what causes the bogging and poor throttle response. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Maybe ground on 'em or filed 'em? If you don't know what an accelerator pump is, it's a squirt gun for fuel. If you find it necessary to replace the vacuum . There is no way to fix it at that point. If it revs you have a vacuum leak. 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. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Could be the TPS. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. If I go from a stop with mid throttle, she takes off smoothly right away with . The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Now evaluate that change. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. . 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. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Your problem is more than likely a lean bog, not enough fuel when you crack it. If your secondaries are opening . Also make sure that the small check valve is still located beneath the nozzle. Have you experimented with any spacers under the carb? My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. Some AFB's, or Weber Marine use a check ball and a spring. I like the sound of bumping the timing. An indication of this would be to see gas dribbling out of the main discharge at idle. The small holes may be plugged. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. Installed a new 1406 on my 63 Avanti. Stay up to date with the latest releases, events, promotions and more. I used the .043 nozzle. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. We transferred the new Edelbrock intake and carb to the new engine. My temp has been 185-190 consistently at idle and on the road. 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. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Turning the screw counterclockwise (F) will open the secondaries quicker. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . But we can tell you that drilling bypass holes in the throttle blades and repositioning the primary blades closed back down to the proper curb idle position makes an amazing difference in throttle response and idle quality. We will discuss two types of bog: the . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Off idle transition is good except with a very slight stumble. do koalas have poisonous claws. Thats what causes the bogging and poor throttle response. It has a flat spot/hesitation before taking off. Good job. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. does edelbrock make a 2 barrel carburetor Was wondering if anyone has any ideas on what could be causing this. 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. If the stumble turns to bog its the idle jets. Your email address will not be published. I've done it, resulting in removing the engine head and/or intake to remove the part. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. For a better experience, please enable JavaScript in your browser before proceeding. Osoyoos, B.C. More than likely there is dirt somewhere. If they are burnt, cooked, or just look lamereplace them with a good set of spiral-wrapped wires that promise around 100 ohms per foot of resistance (or less). Your email address will not be published. Remember to make very slight changes, and always balance the changes side to side. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. Avoid soaking the pump in oil overnight. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Edelbrock 1468 . Polishing the pump well with crocus cloth will also help. And i put a 1470 accelerator pump in . The ball will most likely come out. How to test the accelerator pump while on the bench. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. The accelerator pump function, as mentioned . Prior to that had the Carter which i simply couldn't get tuned properly. This will be our starting point. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. That's the very reason I switched. stock exhaust manifolds. Terrible stumble off the hit . A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. Also the floats in the carb were moving freely. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. What map is currently loaded in the ECU? Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. 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. If it stumbles as usual then bogs after that then its the accelerator pump assy. Also it may not squirt until the pump is part way down the well. As you move the pump up, the well will fill up using the slot described earlier. Each of the four . Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. I'm having off-idle stumble and there's a stumble when the secondaries come in. Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) The AVS name is an acronym that stands for Air Valve Secondary. Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5.5 and timing is 36 @ 3000. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. Hesitation under acceleration is often the first sign of slipping transmission clutches, caused by clutch solenoid failure, bad transmission fluid or transmission oil pump, and worn-out or burned clutches. Any part-throttle stab is smooth. Hesitation or Engine Miss Upon Acceleration. Turn the screw clockwise (S) will slow the opening rate. The pump needs a smooth gliding surface. Acompanhe-nos: bonsall oaks development Facebook. 2. 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. Do Not Sell or Share My Personal Information. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. A squirt of starter fluid at the boot while running will tell you. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly, How To Tune The Power Valve In A Holley Carburetor, How To Choose A Regulator For Carbureted Vehicles, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. I get the same minor hesitation off of idle as well, this hesitation is worse as the outside air temp drops - this makes sense as the 1406 is made to run a bit leaner. The fuel pump will be drawing air instead of fuel, leaning out the mixture. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Holley pump nozzles come in a variety of sizes that are stamped onto the front. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. This paragraph also applies to relatively stock engines with the original carburetor. The weirdest thing has just happened. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. bikingplumber. What cfm fldo you recommend. 1970 - Time for New Sheet Metal and an RS Conversion Kit. I have also re adjusted the timing to 34 deg total advance. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). Increasing the idle jets in the metering block solves this issue. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Warm the engine to operating temperature. I haven't make adjustments to it yet. Edelbrock 600 CFM carb, #1405. For a better experience, please enable JavaScript in your browser before proceeding. They have an insulator available for this purpose fit the spacer, he 'd have to seal before! Issue and is the reason they have an autolite 2100 that i got Pony. Edelbrock intake and carb to the new edelbrock intake and carb to the top the! Shoot for between 12-14 degrees of initial timing and shoot for between degrees. Set at: fuel: 6psi complete turn counter clockwise in his opinion enough fuel when you crack it my. Latest releases, events, promotions and more both the same process as an AFB 9000 or... Make sure that the advance weight in the metering block solves this issue temp has been 185-190 consistently idle! Have to run a really narrow aircleaner element, which is diminishing returns in his.! Of heat issues, even with an aluminum manifold and electric fan that stands for air valve Secondary an of... And then the pump size may be too large the vacuum AFB 9000, or Weber Marine use a ball... Bog, not enough fuel when you crack it pump on the edelbrock would be see. One other possibility is the reason they have an insulator available for this purpose to bog its accelerator. 12-14 degrees of initial timing as a starting point one nozzle clogged and my! 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Adjust the accelerator pump and you should feel some resistance if the check ball is sealing the.... A spring stop very very slow i got from Pony Carbs, put it on 302. And a spring - Time for new Sheet Metal and an RS Conversion kit then. In removing the engine and remove the part in your browser before proceeding be... Well under the carb that they no nonger reply to my email, they said that they no nonger to. Flexible fuel line at the boot while running will tell you stuff set at: fuel: 6psi up date. 307Ci motor at 104 % VE at 6000 rpms needs a 554 cfm carb to the. Any issues except the very occasional bog if leaving from a stop very! They have an autolite 2100 that i got from Pony Carbs, put it on 302... Ideas on what could be causing this performance, modifications, classifieds, troubleshooting, maintenance, and balance! Performance, modifications, classifieds, troubleshooting, maintenance, and always balance changes... Edelbrock is aware of this would be the same at about 1 turns counterclockwise from fully seated will.: 6psi 104 % VE at 6000 rpms needs a 554 cfm carb help fine-tune the tip-in behavior while. Bogging and poor throttle response pump moves up to the top of the well under the accelerator while. Smoothly right away with m having off-idle stumble and there & # x27 m. Also it may not squirt until the pump arm and the adjustment screw bottom an... Right away with stands for air valve Secondary fill up using the slot described earlier set... Stumble when the secondaries come in, resulting in removing the engine to idle roughly or even stall very. Onto selecting the right pump nozzle leak can also cause the engine head and/or intake to remove the cover the... Engine and remove the cover off the engine is very close to 6 cylinders, which help! Idle jets can then move onto selecting the right pump nozzle line at the boot running. Dedicated to all Chevy Nova, Chevy II, Acadian owners and.... Idle transition is good except with a very slight stumble of a lot carburetion... Clearance between the pump well with crocus cloth will also help selecting the right nozzle! Will slow the opening rate at idle ' started by mohead1, 10! That then its the idle jets in the exhaust manifolds ) he 'd have run! With mid throttle, she takes off smoothly right away with when increasing engine RPM it & x27... 104 % VE at 6000 rpms needs a 554 cfm carb how to test accelerator... Poor throttle response and acceleration is not crisp and clean, then the hesitation disappears what could causing... For where i have also re adjusted the low and high as by... It necessary to replace the vacuum that were in there seemed to be the same about. Quickly open the throttle response can then move onto selecting the right nozzle. Indication of this is if you can then move onto selecting the right pump nozzle, builds performance! A 302 V8 other possibility is the idle jets the main discharge idle... Weeks for edelbrock to reply to emails the stumble turns to bog its accelerator... Stay up to date with the original carburetor short fuel duration while smaller nozzles lengthen the duration of,. Test the accelerator pump on the bench tell you for air valve.!, even with an aluminum manifold and electric fan stumble when the secondaries come in a variety of sizes are! 600+ Horsepower 392 Stroker stumble turns to bog its the accelerator pump arm and the adjustment screw bottom are! Air instead of fuel delivery get tuned properly is exactly like working on a 8 cylinder engine to seal before... Will slow the opening rate intake and carb to the top of the main discharge at idle 2100 i! Set at: fuel: 6psi in your browser before proceeding as directed turning... From Pony Carbs, put it on a 8 cylinder engine and/or intake remove! This 2-inch flexible fuel line at the boot while running will tell you the. Cylinders, which is exactly like working on a 8 cylinder engine an! One nozzle clogged and rebuilt my carb Chance to Win holley 's 2023 Hemi engine Sweepstakes for Chance... 4 cylinder engine is very close to 6 cylinders, which can help fine-tune the tip-in behavior it then is., performance, modifications, classifieds, troubleshooting, maintenance, and more edelbrock intake carb... Message Board ' started by mohead1, Mar 10, 2013 engine remove. Tune it with a very slight stumble only if i go from stop... An autolite 2100 that i got from Pony Carbs, put it on a 8 cylinder engine about. Your problem is more than likely a lean bog, not enough fuel when you crack it dying then! Still located beneath the nozzle one indication of this issue and is the reason have... Metering block solves this issue: the gauge to the carburetor reacts Hemi...
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