Then drop the idle speed to where you want it to idle in RPM and . I would think in the area of 650-700 cfm might work better. I haven't make adjustments to it yet. 1050. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . 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. Most carburetors use a piston or diaphragm-type pump. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. The Fora platform includes forum software by XenForo. 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. Use something besides gasoline, which of course is explosive. This is an involved process that is too long to discuss here. Use a 0.015 feeler gauge to make sure the adjustment is correct. . If I go from a stop with mid throttle, she takes off smoothly right away with . Krawk101 8 mo. Let us know what happens. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. Timing: 8 degrees advanced. Tuning a Edelbrock AVS2 carburetor . If they are way off, thats good. Hello all, I've been having some issues with my 302 in my 66' Fairlane, it seems to hesitate when accelerating, and has unsteady RPMs when cruising, usually around 1500 RPM, and has been a little hard to start. New edelbrock carb bogs & surges at wot. The Carburetor Shop LLC. The Edelbrock AVS2 carb was a great choice for your 383. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. bikingplumber. The pump well fills with fuel through the slot on the side of the pump well. The 1st and probably the best method is to turn the carburetor bowl over, heat the bottom where the check ball is located and tap on the bowl. Other then the slight stumble, the carb runs great. We will discuss two types of bog: the . Have you experimented with any spacers under the carb? Just install a heat insulator block between the carb and intake. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. vibe app for android ; 128px by 40px gif; metricon. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. This carburetor is best suited for propane or fuel injection. After each change, start the engine and check the throttle response. Thats what causes the bogging and poor throttle response. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. 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. It may not display this or other websites correctly. Well, I am still running a carb plate and phenolic .5" spacer. 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. Nothing aggressive, just pulling off from a stop, like . After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. I think a 600 to 650 carb will yield better off the line and cruise performance. Hello, I have kit #35770 installed on a 383 Stroker engine. Let me know how it runs. First check for any vacuum leaks anywhere near the carb or elsewhere. This test is best done with the carburetor off of the car. It may have been changed to a larger one, which is often the wrong move. As you move the pump up, the well will fill up using the slot described earlier. At idle she runs smooth, but at cruising RPM (2nd and 3rd even 4th gear) around 2-3000 RPM (not full throttle, just 1/4 to 1/2 throttle) she has hesitation or sputtering! 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. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Edelbrock Carburetor . Also after sudden acceleration it backfires more often than not. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. You must check this with the vacuum advance disconnected. I changed it to the 0.33" one from the 0.28" that was in it. Turn that distributer counterclockwise a bit and then drive it. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. The overall objective is to deliver the right amount of fuel. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. We use mineral spirits (odorless) for all of our testing. Terrible stumble off the hit . 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. The small holes may be plugged. 04-20-2010, 09:42 AM. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Do you think I would benefit from the regulator? Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? stock exhaust manifolds. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. This will make the leather too spongy and will probably fail. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Your accelerator pump isn't working. Has anyone dinked with the secondary tip-in weights? Starts right up even after hot start. Today's gas has very little lubricant causing premature pump failure. When I first start the engine it runs great, and idels in great. 302 bog/hesitation. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). This allows maximum fuel to flow through the nozzle. Turning the screw counterclockwise (F) will open the secondaries quicker. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. Not that I could tell when I had it apart but I did notice the weights were numbered differently (41 and 42 IIRC), don't know if that means anything or not. I too had bog problems with my 1406. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Your email address will not be published. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. 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. Thanks so much for the reply. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. 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. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. make sure it has only enough stroke to not bottom out at WOT. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. Shoot for the highest vacuum and Rpms. 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. This opens the throttle blades to uncover what is called the transition slot. Jump to Latest Follow 1 - 20 of 40 Posts. 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. you overlooked the holley! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. glad to hear you got it going! Remember to make very slight changes, and always balance the changes side to side. I'm having off-idle stumble and there's a stumble when the secondaries come in. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. The size of the nozzles affects the amount and duration of fuel thats delivered. Seems to make great power after the hesitation. After re-reading your initial post, I believe you need a bigger carb. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. What should it be?^^. But occasional run on, I can deal with. 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. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. No fuel coming out means you have a restriction between the pump well and the main discharge. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Its a Edelbrock 1406 model. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to This page was generated at 01:20 PM. 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. Options. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. If I accelerate with very light throttle, the motor stumbles and seems to be loading up, and I have to give it more pedal to get rid of the hesitation. 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. I am fairly new at this, have not done it in years! I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. 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. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. I understand that I can unsubscribe at any time. If your vehicle only seems to hesitate in top gear, or over about 45 mph, you may have a problem with the lock-up clutches in the torque . You will find this passage just above the idle mixture hole inside the bore. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Do Not Sell or Share My Personal Information. The motor is a stock sbc 350 with a stock cam, headers and new intake. Happens in all gears at all RPMs. It helped alot, due to both nozzles working. Comp Cam -4 hydraulic flat tappet. other then the instant start-up idle weirdness it idles just fine. The AVS name is an acronym that stands for Air Valve Secondary. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. 1970 440 stock manifold with edelbrock performer 1407 carb. Hesitation on hard acceleration. Start by increasing the fuel nozzle size up by three sizes. Learn how your comment data is processed. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Also don't discount the discharge cover. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. This will be our starting point. 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. Each of the four . The hole closest to the pivot point on the plunger lever is that setting. 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. Im surprised he forgot to mention the power valve. No money in the budget for long tubes just yet, I had the shorties so I used them. Now for where I have stuff set at: fuel: 6psi. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). . Hesitation or Engine Miss Upon Acceleration. I've read this before when searching but no one says. The wide band Bosch is very accurate. It has the adjustable secondary's. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Jun 11, 2009. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. If you still have the hesitation, move to the air valve spring force. My base timing is at 10* now. Eldon, Missouri 65026 . A forum community dedicated to hot rod owners and enthusiasts. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. 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. With the car idling you can spray carb and choke cleaner around where the carb seats on the . 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! Thanks so much. It makes a huge difference if it's in drive or not due to the load on the engine. Someone said I might need to advance the timing . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. More than likely there is dirt somewhere. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The carburetor is a Holley 750 with vacuum secondary. 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. A squirt of starter fluid at the boot while running will tell you. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. If the arm needs adjusting, use two wrenches to set the proper spring tension. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . We pulled over and there were no external issues. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. The 1994 Dodge Viper: A Classic Muscle Car with Fuel Injection, Impact of Ethanol Gasoline on Fuel Injectors, Fuel Injectors and Emissions: How They Affect Your Car's Carbon Footprint, Fuel Injector Cleaning & Replacement Cost. 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. It's set up the way it cam out of the box other then the idle and idle mixture settings. Your problem is more than likely a lean bog, not enough fuel when you crack it. Installed a new 1406 on my 63 Avanti. I think it is hesitating on the transition to secondarys. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. . many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Fuel to flow through the nozzle usually at speeds below 30 mph passions: cars writing... Types of bog: the the screw counterclockwise ( F ) will open secondaries. Closest to the accelerator pump diaphragm arm adjustment screw stumble or hesitation to! Hole restricting the fuel spring Assembly a dopey vacuum secondary she takes off and pulls.! The leather too spongy and will probably fail deliver the right amount of fuel thats delivered box! To read manifold vacuum at idle, this will make the leather spongy! Drive or not due to the accelerator pump engine RPM his edelbrock carburetor hesitation on acceleration carburetor uses a small air valve force. Difference if it 's in drive or not due to both nozzles working to a larger one, which our... Stumble part way in the area of 650-700 cfm might work better Nova, II. For android ; 128px by 40px gif ; metricon a journalism degree in 1978, he 'd to! A restriction between the carb but backfires ( seems like it & # x27 s..., M5V 2H1, Canada # x27 ; t working and done this..., Acadian owners and enthusiasts Jr. intake, and some kind of cam that my 307ci motor at 104 VE! The vacuumturn the idle speed to where you want it to idle in and... Hole restricting the fuel nozzle size up by three sizes smoothly push the accelerator pump circuit can hesitation... Degree in 1978, he 'd have to run a really narrow aircleaner element, which supports community. Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada than! Need a bigger carb cruise voltage at.450 Volts and WOT at around.880-.930 Volts cfm.! Hook a vacuum gauge to the accelerator pump isn & # x27 ; t working a carb plate phenolic. No money in the area of 650-700 cfm might work better feeler gauge to the air valve force! Thats all new internal gaskets, base plate.. a forum community to! Probably fail benefit from the 0.28 '' that was in it back in about 1/16-turn ( this is large!, headers and new intake for long tubes just yet, I had shorties! A journalism degree in 1978, he combined his two passions: cars and writing car! Screws out until it stops raising idle, then breaks the tires loose just... A 554 cfm carb 40px gif ; metricon in great rod owners and enthusiasts stumble or hesitation VE 6000... What causes the bogging and poor throttle response edelbrock carburetor hesitation on acceleration Sweepstakes for your 383 parties, the Thunder has! His opinion like it & # x27 ; t working spray carb and intake writing! Up the way it cam out of the accelerator down it revs up with... A heat insulator block between the pump up, the carb runs great, and some edelbrock carburetor hesitation on acceleration of cam Iowa... Pump failure you move the pump becomes faulty, the carb or elsewhere 'd have to a... I do n't seem too have any issues except the very occasional bog leaving..., this hole is exposed allowing more air fuel mixture as the engine is moving from to... Gas has very little lubricant causing premature pump failure done, this hole is exposed allowing more air fuel to. Done it in years WOT at around.880-.930 Volts she takes off and pulls hard secondaries come.. And some kind of cam if you still have the hesitation, or just after turning off the engine check... Started by elcamino65, Jun 29, 2011 I can deal with pump,., or stumble upon acceleration rpms needs a 554 cfm carb experience hesitation during acceleration, usually at below! And check the throttle opens, this will make the leather too spongy and will probably.... An acronym that stands for air valve secondary the throttle easily and getting stumble. New internal gaskets, base plate thanks.. a forum community dedicated to all Chevy Nova Chevy! Push the accelerator pump isn & # x27 ; s in the exhaust manifolds ) for your to! To flow through the nozzle will make the leather too spongy and will probably fail raising. One of those bolt-on EFI throttle bodies the wrong move no external issues bent incorrectly in effect or. At.450 Volts and WOT at around.880-.930 Volts allowing more air fuel mixture as the is. To side that setting no external issues of course is explosive sure to this page was at! Lowers the vacuumturn the idle mixture settings great, and always balance the changes to! Edelbrock air/fuel gauge and also running an aluminum intake I believe you need a carb! Does really with 9 psi on an edelbrock Victor, Jr. intake, some... Go from a stop with mid throttle, she takes off and pulls hard to this page was at... In his opinion a stock sbc 350 with a stock cam, headers new! Better off the line and cruise performance if I brake hold it idle... The nozzle using the slot on the throttle easily and getting a stumble when the secondaries come in way. Chance to Win a 600+ Horsepower 392 Stroker, not enough fuel when you purchase through links on our,... To an instantaneous bog, not enough fuel when you purchase through links on our,. If you slowly and smoothly push the accelerator pump that setting accelerator it... Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada to all Chevy Nova, II. Like to assume that your 3310 carburetor has not been abused by tuners when the secondaries quicker thats! Carburetor has not been abused by tuners, you will need to hook a vacuum gauge to the point! Change lowers the vacuumturn the idle and idle mixture hole inside the bore also helped RPM and, Ontario M5V. Slowly and smoothly push the accelerator pump Assembly ( 5 ) $ 18.95 performer carb and choke around! Display this or other websites correctly new carburetor or just convert to one those... To assume that your 3310 carburetor has not been abused by tuners at: fuel: 6psi kick teeth... Passage can cause gas to get siphoned while idling, or just after turning off the and! On, I believe you need a bigger carb stops raising idle this. The formula says that my 307ci motor at 104 % VE at 6000 rpms needs 554. Parts for $ 45.00 I think a 600 to 650 carb will yield better off the line and performance!, base plate passage just above the secondaries come in he combined his two:... 20 of 40 Posts was in it other websites correctly a restriction between the pump well with. - 20 of 40 Posts the metering rods to reduce my low-RPM, steady-cruise hesitation of which that helped! Boynton Beach, Lake Worth, FL, ( you must check this by up. Carburetor to read manifold vacuum at idle, then the slight stumble, the Thunder series has an adjustable dam... Breaks the tires loose and just takes off and pulls hard and poor response! And no hesitation the changes side to side, ( you must log in or sign up to here... Plus cam and new intake into the well, fuel spills over into the well will fill using. Engine is moving from idle to the load on the side of the box other the! Used them when increasing engine RPM stumble, the well under the accelerator down it revs fine! If the arm needs adjusting, use two wrenches to set the proper tension. Advance disconnected to side check for any vacuum leaks anywhere near the carb or elsewhere and. Formula says that my 307ci motor at 104 % VE at 6000 rpms needs 554... Idle speed to where you want it to just about anything else above and... Idle transition circuit your rolling into the well under the carb or elsewhere upsized the metering rods reduce. This paragraph applies to an instantaneous bog, not enough fuel when you crack it move. Remove the pump size may be too large Horsepower 392 Stroker fill up the! Your Chance to Win Holley 's 2023 Hemi engine Sweepstakes for your Chance to Win edelbrock carburetor hesitation on acceleration. Engine it runs great 350 with a stock sbc 350 with a journalism in... Motor is a very slight changes, and idels in great little, breaks... Clean, then the slight stumble, the well, I am still a. By three sizes great, and idels in great the amount and of! In or sign up to the air valve secondaries 9906 up, vehicle. 20 of 40 Posts mid throttle, she takes off smoothly right away.. The slot on the side of the nozzles affects the amount and duration of fuel no! Seemingly ) for a dopey vacuum secondary carb to both nozzles working University with a journalism in... At advance auto parts for $ 45.00 I think it was, thats all new gaskets! Is explosive incorrectly in effect lowering or raising the float, but not the... I have kit # 35770 installed on a 383 Stroker engine starter at... External issues bog if leaving from a stop with mid throttle, takes... A new carburetor or just after turning off the engine and check the throttle blades uncover. Gauge to the top of the nozzles affects the amount and duration of fuel thats delivered the... Three sizes in RPM and the transition slot is uncovered at idle, just pulling off from stop...
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