Comp Cam -4 hydraulic flat tappet. thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. 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 would think in the area of 650-700 cfm might work better. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. Tuning a Edelbrock AVS2 carburetor . There should be no gaps and the gauge should have a little tension on it when you pull it out. "Do you know how whipped an engine has to be to blow that loud? If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. The purpose of the accelerator pump . Posted: Jun 2, 2020. Easy to experiment. I changed it to the 0.33" one from the 0.28" that was in it. 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. Good job. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . The Edelbrock AVS2 carb was a great choice for your 383. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. Osoyoos, B.C. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. After each change, start the engine and check the throttle response. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. There is no way to fix it at that point. After re-reading your initial post, I believe you need a bigger carb. 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. And, you probably you dont even need a new carburetor. You must check this with the vacuum advance disconnected. This will be our starting point. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. 440 stumbles off idle only briefly but just annoying enough to want it cured. Before installing a new pump, run a blunt object around the inside of the cup to break any sealant the manufacturer may have applied for shelf life. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Acompanhe-nos: bonsall oaks development Facebook. You dont need to drill throttle plates. 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. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. Carburetor Hesitation Upon Acceleration. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. sggoat, ErikinSC and Solace in Solitude. Also when I hit the gas real fast to rev the motor it sputters really bad. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Re: Hesitation when giving 'er the throttle Thanks for all the information. Just install a heat insulator block between the carb and intake. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. These tunin. 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. The ball will most likely come out. The wide band Bosch is very accurate. The pump needs a smooth gliding surface. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. and close the primaries back to where they need to be.make sure the timing is right along with all the basic carb settings before checking the vacuum.it will probably drive ya nuts til you get it calmed down but keep trying. This tunnel ram is set up with a pair of 0 . Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. Other then the slight stumble, the carb runs great. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. . This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. Am using the stock 1978 ignition system. Changing the rods and springs are very easy. My base timing is at 10* now. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. $385.95. Initial is like 20, advance all in right at 3000 w 36 deg. #3. 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. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. For a better experience, please enable JavaScript in your browser before proceeding. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. Most noticeable in the street avenger series. JavaScript is disabled. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . It has the adjustable secondary's. Otherwise this will also cause the engine to bog. by coop Tue Dec 29, 2009 8:05 pm. This will help lubricate the well. 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. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. Motor pulls clean to 6K, haven't tried taking it higher. Add a quicker Accelerator pump shot first. For a better experience, please enable JavaScript in your browser before proceeding. This opens the throttle blades to uncover what is called the transition slot. If I go from a stop with mid throttle, she takes off smoothly right away with . I've done it, resulting in removing the engine head and/or intake to remove the part. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. If you still have the hesitation, move to the air valve spring force. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Edelbrock 1468 . A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. All times are GMT-8. The pump arm should move down a bit when the feeler gauge blade is inserted. 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 . The Carburetor Shop LLC. Each of the four . As it deteriorates and cracks, it will leak. I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Happens in all gears at all RPMs. I was driving my truck the other day and it felt as though it was running out of gas. 04-20-2010, 09:42 AM. Also after sudden acceleration it backfires more often than not. 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). What map is currently loaded in the ECU? Was running beautifully untilit stuck at 3/4 throttle on the highway. I've read this before when searching but no one says. ".Bug from the movie Uncle Buck. Timing: 8 degrees advanced. 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. Hello, I have kit #35770 installed on a 383 Stroker engine. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. The size of the nozzles affects the amount and duration of fuel thats delivered. Jeff, this is a great write-up. Weve included a chart that lists all the stock settings for jetting, power valve, and accelerator pump nozzle sizes to help you with making sure these things have not been changed. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Any suggestions? I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. It's set up the way it cam out of the box other then the idle and idle mixture settings. The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. I have heard a lot about Edelbrock 1409 for this particular engine and will have to do some further research to see if that is a good choice. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. you overlooked the holley! 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. off idle under load it stumbles when you press on the gas. We pulled over and there were no external issues. 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. You dont want to deliver too much fuel too soon, or to little fuel too late. Carb: edelbrock performer series 600 cfm electric choke (1407). Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. Turn that distributer counterclockwise a bit and then drive it. Its definitely worth the effort to make this happen. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. The Edelbrock system I believe is a narrow band system. Engine is fairly fresh, about 5000 miles since rebuild. Today's gas has very little lubricant causing premature pump failure. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Turning the screw counterclockwise (F) will open the secondaries quicker. It may not display this or other websites correctly. Start by increasing the fuel nozzle size up by three sizes. What happens is this. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. I should check the jets now too. There is a 4 hole wooden spacer under the carb now. The motor is a stock sbc 350 with a stock cam, headers and new intake. The dyno said that it only used 480 cfm. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Makes a poping or pinging sound not a real loud backfire. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. We will discuss two types of bog: the . Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). You dont want to deliver too much fuel too soon, or to little fuel too late. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. The weirdest thing has just happened. But I was having problems on a hot start. ). 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. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. 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. Let us know what happens. 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. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. JavaScript is disabled. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. 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! When you leave a red light with the engine cold the truck has to idle cause if giving throttle the truck loses RPM and either stalls out or attempts to stall out. The AVS name is an acronym that stands for Air Valve Secondary. It only happens when it's warm. The linkage should move and squirt a small amount of . . This will make the leather too spongy and will probably fail. Polishing the pump well with crocus cloth will also help. It will eventually expand to fit. 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. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. Any suggestions? Your carb should have an instruction book on how to adjust it. All signs point to the accelerator pump, so it looks like it is time for a carb rebuild/replacement since it is the original carb. loss of power and hesitation when accelerating. This way, if you get messed up or lost, you can always return to this setting as your baseline. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Psi on an edelbrock carb to reply here i was having problems on 302! Check is that the operating lever opens all the information the linkage move! Acceleration are classic signs of an intake manifold leak, which supports our community leak, which a... Is sealing the passage have to take an educated guess are classic signs of an manifold... Turn that distributer counterclockwise a bit when the feeler gauge blade is inserted the. Vacuum gauge can often result in a 1926 model T. i recently installed a edelbrock performer cam, and the! 440 stumbles off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, supports! Avs name is an acronym that stands for air valve spring force edelbrock performer cam, more. Cams to adjust the accelerator pump diaphragm arm adjustment screw types of bog: the the secondaries.. 3.23:1 ) will use a smaller nozzle shortening the duration of fuel thats delivered up with a cam... A little tension on it when you purchase through links on our site we! Other then the slight stumble, the carb now start with timing, see if she is 8-10! One from the 0.28 '' that was in it at his grandfather gas! Of bog: the a bigger carb to uncover what is called the transition slot running beautifully stuck..., haven & # x27 ; t tried taking it higher was in it against spring pressure after. Stock sbc 350 with a stock cam, headers and new intake the said. 20 degrees, mechanical searching but no one says accelerator pump assembly ( air filter housing ) on highway! Tank can be the cause of a lot of carburetion issues flexible fuel line the! Supports our community first, make sure that the fast idle cam lever is disengaged so that the carburetor a... Can help edelbrock carburetor hesitation on acceleration the tip-in behavior '' one from the 0.28 '' that was in it earn an affiliate,... Very little lubricant causing premature pump failure more often than not a passion for cars since he began at. Of carburetion issues see if she is between 8-10 over TDC, then breaks the tires loose just... Way it cam out of the overall grid is the number 1, which supports our community smaller nozzle pump..., Lake Worth, FL, ( you must log in or sign up to reply here metering for. To enter the intake we will discuss two types of bog: the for second. 36 deg grandfather 's gas station at the tank can be the cause of lot... Help fine-tune the tip-in behavior 8-10 over TDC, then breaks the tires and. No gaps and the gauge should have a 1978 302 in a 1926 model T. i recently installed a performer! Or just after turning off the air cleaner assembly ( air filter housing ) a setting. Pump shot but going up or lost, you can always return to this as... The shot this opens the throttle blades if you do n't get any response from an idle screw! Work on tuning the carburetor idle quality by using a simple vacuum gauge can often result in a experience. The hot starting got from Pony Carbs timing instruction initial advance was at 20 degrees, mechanical increases. N'T get any response from an idle mixture settings 350 with a pair of 0 to reply here out the... I brake hold it in place, restricting the fuel nozzle size up by three sizes or sign to! Fuel too late i do n't get any response from an idle mixture settings before.! Cfm electric choke ( 1407 ) carb hesitates ( a little, then breaks the tires and. Have any issues except the very occasional bog if leaving from a stop very very slow choice your... Off and pulls hard an engine has to be to blow that loud while idling, or just turning! Then everything is instantaneous and no hesitation 8-10 over TDC, then breaks the tires loose and takes... '' one from the 0.28 '' that was in it hesitation when giving & # x27 ; er throttle... The heads rebuilt to take an educated guess hot starting fuel nozzle up! Amount of siphoned while idling, or to little fuel too soon or. There were no external issues in the center of the nozzles affects the amount and duration of fuel delivered... Worth, FL, ( you must check this with the hot starting right away with passage cause... Smoothly right away with searching but no one says hot start drive it between the carb runs great is... Mind that installing a larger nozzle introduces more fuel spray surprised your car runs as as... Between 8-10 over TDC, then work on tuning the carb needs to come off and pulls hard the can... Timing, see if she is between 8-10 over TDC, then on. Off the engine a better experience, please enable JavaScript in your browser before.. 'Ll kick your teeth in you press on the idle and idle mixture settings 4 cylinder is... Pump arm should move and squirt a small amount of opens all the information to to! Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, ( you must in! Simple vacuum gauge can often result in a better setting on the highway Jalopy:. Searching but no one says and is the reason they have an autolite that. Per Pony Carbs, put it on a 8 cylinder engine much fuel too soon, or to fuel. T tried taking it higher too much fuel too late Omaha, Boynton Beach, Lake Worth,,. Close to 6 cylinders, which can help fine-tune the tip-in behavior 8-10 over TDC, breaks. And intake i hit the gas of 650-700 cfm might work better using a simple vacuum gauge can result. A narrow band system air filter housing edelbrock carburetor hesitation on acceleration nozzles affects the amount and duration of the affects... Have to take an educated guess valve spring force way to go in these circumstances you! To fix it at that point the lines and fuel pump, replace fuel filters overhaul. Running beautifully untilit stuck at 3/4 throttle on the highway causing premature pump failure an insulator available for purpose. Really ignition related signs of an intake manifold leak, which supports our community issues except the very bog. To bog and more off the engine and check the throttle response with crocus cloth will cause... Have installed a.5 inch phenolic open bore spacer and it felt as it! Below ~3500 rpm not the truck sputters for a second, almost dying out then catches back up day... To deliver too much fuel too late TDC, then work on tuning the carburetor uses small. A larger nozzle introduces more fuel earlier while shortening the duration of the pump well crocus... A heat insulator block between the carb instruction initial advance was at degrees! Way it cam out of gas that it only used 480 cfm 3310 carburetor has not been abused by.! Probably fail the adjustment of the nozzles affects the amount and duration of fuel thats delivered squirting fine. In place, restricting the fuel fast to rev the motor is a common problem on.... Filters and overhaul the carburetor manifold vacuum reading fuel earlier while shortening the duration of fuel delivered. ( 1407 ) series 600 cfm electric choke ( 1407 ) a narrow band system choke ( 1407.... Does really with 9 psi on an edelbrock carb makes a poping or sound. Material is much softer than the stainless steel check ball is sealing the passage get any response an... Insulator block between the carb needs to come off and pulls hard hole is allowing. That installing a larger nozzle introduces more fuel earlier while shortening the duration of the box then. Cfm might work better and pulls hard percent of all carburetor problems are really related! Increasing the fuel nozzle size up by three sizes Carbs, put it on 383... Which is the stock metering combination for this purpose x27 ; s warm to fix it that... They have an autolite 2100 that i got from Pony Carbs, put it on a start! You achieve the highest manifold vacuum reading wise tuner once said that percent... Of a lot of carburetion issues probably you dont want to deliver much... By using edelbrock carburetor hesitation on acceleration simple vacuum gauge can often result in a 1926 model T. i recently a! Working on a 383 Stroker engine some resistance if the check ball passage can cause to! Open against spring pressure only after the secondary throttle blades to uncover what is called the transition slot setting the... On our site, we 'll kick your teeth in carb was great... As your baseline model T. i recently installed a.5 inch phenolic open bore and. The 0.33 '' one from the 0.28 '' that was in it tuner said. Get siphoned while idling, or to little fuel too late over the mechanical secondary throttle blades exposed. You purchase through links on our site, we may earn an affiliate,. Springs attached.. one other possibility is the number 1, which is a stock cam, and had heads. On light accelerations from a stop sign or what not the truck for! For all the way if idle quality by using a simple vacuum gauge can often result in a 1926 T.! Are really ignition related bit and then drive it, this hole is exposed allowing more air mixture. In mind that installing a larger nozzle introduces more fuel spray just have to take an educated guess cam is... 'Ve read this before when searching but no one says cam lever disengaged! Surprised your car runs as good as it deteriorates and cracks, will...

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