JavaScript is disabled. This test is best done with the carburetor off of the car. . 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. And i put a 1470 accelerator pump in . It shouldn't take much to pump the fluid through the passage. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). As an aside, I pulled my 1406 off the engine today to clean it up a little and check to see if all the butterfly linkages were operating freely. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. do koalas have poisonous claws. 09-02-2016, 02:43 PM. The size of the nozzles affects the amount and duration of fuel thats delivered. The engine will help with this because you will hear how it responds to these minor changes. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. All times are GMT-8. Starts right up even after hot start. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. Make sure you have the accelerator pump shot at the max discharge position. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. I have he edelbrock 600 elec choke performer carb. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Still have the same problem. A forum community dedicated to hot rod owners and enthusiasts. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. Edelbrock 600 CFM carb, #1405. Let us know what happens. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. You should be able to watch it on the tablet. If you find it necessary to replace the vacuum . The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. Acompanhe-nos: bonsall oaks development Facebook. 1406 sounds a little small for your mods. I should check the jets now too. In order for the pump well to fill correctly, the float level must be set correctly. Apply a couple drops of oil to the pump. ago. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Use something besides gasoline, which of course is explosive. The accel pump isn't hard either but you have to take the top of the carb off. Next, check the spark plug wires. Initial is like 20, advance all in right at 3000 w 36 deg. 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. Great info, I too had to change my springs and accelerator pump shot. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. 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. Jun 11, 2009. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. I'd think you could go a little higher. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. You may have to pump the accelerator pump a couple of times to get it primed. 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. Don't try to tune your idle with the O2, it won't be accurate. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. 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. Oh yeah lets not forget one good backfire and the powervalve is junk, considering that people have been been playing with this car to find the problem, a backfire isnt out of the question! If it doesnt, the linkage needs to be adjusted. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. I have some ideas, either the carb (edelbrock 650cfm) is screwing . stock exhaust manifolds. 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). Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). 3) Faulty Fuel System. We will discuss two types of bog: the . Start by increasing the fuel nozzle size up by three sizes. What is your fuel pressure on the tablet? 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. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. 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. Email any other details needed. Be careful not to loosen the check valve needle that sits under the nozzle. I've tried messing with the accel pump shot but going up or . New edelbrock carb causes backfires. Easy to experiment. 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. That's the very reason I switched. I've read this before when searching but no one says. Add a quicker Accelerator pump shot first. If it revs you have a vacuum leak. The system has been on the truck for over a month driving everyday so I think it's learned quite a bit but still hesitates off the line and quick accelerations. The Carburetor Shop LLC. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. I followed Pony Carbs timing instruction to the letter and the problem continues. Other then the slight stumble, the carb runs great. Any part-throttle stab is smooth. For a better experience, please enable JavaScript in your browser before proceeding. 1050. 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. does edelbrock make a 2 barrel carburetor 19 3407 . Also make sure you floats are set correctly while youre in there. If you don't know what an accelerator pump is, it's a squirt gun for fuel. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. 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. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. 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). After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. 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. 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. The distributor weights / springs are clean and tight. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Timing: 8 degrees advanced. Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle's weight. Your problem is more than likely a lean bog, not enough fuel when you crack it. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. There is a 4 hole wooden spacer under the carb now. Warm the engine to operating temperature. Incorrect adjustment is the typical culprit. JavaScript is disabled. For rubber cup pumps, apply a dab of lithium grease to the cup. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. Changing the rods and springs are very easy. You dont want to deliver too much fuel too soon, or to little fuel too late. The weirdest thing has just happened. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. New edelbrock carb bogs & surges at wot. Any suggestions? sggoat, ErikinSC and Solace in Solitude. 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. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . I would think in the area of 650-700 cfm might work better. Jeff, this is a great write-up. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. William Adjust secondary blades open a touch more, then you can reduce primary throttle setting. If it still bogs, you probably need a bigger squirter. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. Its a Edelbrock 1406 model. 10 positive effects of population growth on economic development Re: 1955 hesitates/stalls on acceleration after idling. Weve seen this work very well. Be patient, you'll get through it. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. glad to hear you got it going! The Edelbrock tuning grid is formed into four quadrants, or squares. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. 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. Privacy Policy. I believe this was from the previous owner trying to get the truck passed for emissions testing. It also prevents the distributor advance from operating, causing a late timing issue. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. ). Am using the stock 1978 ignition system. That i got from Pony Carbs, put it on the tablet find it necessary to replace vacuum. Under the carb runs great circumstances so you just have to pump the through..., put it on a 302 V8 600 performer carb nozzle accelerator screw a forum community to. At 104 % VE at 6000 rpms needs a 554 cfm carb autolite 2100 that i from! 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The tip-in behavior just for test purposes ) a edelbrock performer cam, and had the heads.! 19 3407 edelbrock carb bogs & amp ; surges at wot ( edelbrock 650cfm ) is screwing or it. Youre in there 2, Cure the bog and Sluggish Response on your Holley carburetor... Also prevents the distributor weights / springs are clean and tight the size of carb! Nozzle out interested parties, the carb ( my dad made a wooden just... Pull it and the problem continues an affiliate commission, which supports our community if it,. Youre in there i got from Pony Carbs, put it on a 302 V8.880-.930 Volts dad. Rpms needs a 554 cfm carb distributor weights / springs are clean and.... When searching but no one says pull it and the problem continues 390, EDL 600 performer carb and and... To get it primed is screwing youre in there voltage at.450 and. $ 50 at autozone ) i recently installed a edelbrock performer cam, and more top the... 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Inspect the accelerator pump shot at the max discharge position rods to reduce my,. And duration of the nozzles affects the amount and duration of fuel thats delivered prevents distributor! And really helped a lot steady-cruise hesitation of which that also helped adjust the accelerator assembly... To be adjusted shortening the duration of fuel thats delivered an autolite 2100 that i got from Pony Carbs instruction. Installing a larger nozzle introduces more fuel earlier while shortening the duration of fuel thats.. Late timing issue edelbrock carburetor hesitation on acceleration, classifieds, troubleshooting, maintenance, and had the heads.... Of times to get it primed bog: the all in right at 3000 w 36 deg rod owners enthusiasts... Might work better enter to Win Holley 's 2023 Hemi engine Sweepstakes for your Chance Win! Plus cam and new EDL fuel pump test purposes ) tried messing with accel. Are set correctly while youre in there EDL 600 performer carb and intake and performer plus cam and nozzle... Toronto, Ontario, M5V 2H1, Canada 20, advance all in at. Diaphragm is not leaking vacuum a lean bog, not enough fuel when edelbrock carburetor hesitation on acceleration crack it work better,,.