Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Osoyoos, B.C. Thanks so much. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The pump well is tapered and the accelerator pump will seem too small at the top. Polishing the pump well with crocus cloth will also help. There should be no gaps and the gauge should have a little tension on it when you pull it out. The problem is hesitation on acceleration fron stop after the engine is warmed up. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. The well is tapered and also the pump cup may not be swelled up yet. stock exhaust manifolds. Also the floats in the carb were moving freely. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Someone said I might need to advance the timing . You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. The small holes may be plugged. Weve seen this work very well. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. Most noticeable in the street avenger series. Your email address will not be published. sggoat, ErikinSC and Solace in Solitude. Use a 0.015 feeler gauge to make sure the adjustment is correct. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. A forum community dedicated to hot rod owners and enthusiasts. Insert the accelerator pump and push it to the bottom. Also it may not squirt until the pump is part way down the well. $385.95. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. bikingplumber. I've tried messing with the accel pump shot but going up or . What are your AFR Targets set to? Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. The motor is a stock sbc 350 with a stock cam, headers and new intake. Starts right up even after hot start. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Stock is the 5" HG springs. I just don't really have any reason to stab it WOT from idle from a dead stop. 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. If it revs you have a vacuum leak. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. JavaScript is disabled. What is your fuel pressure on the tablet? https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to What would you suggest? Hello, I have kit #35770 installed on a 383 Stroker engine. Start by increasing the fuel nozzle size up by three sizes. Changing the rods and springs are very easy. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. 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. Retains stock bore and stroke. Other then the slight stumble, the carb runs great. But I was having problems on a hot start. 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. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. This will cause your engine to lag, stumble, or hesitate. No, as in driving the car on the street. This will make the leather too spongy and will probably fail. J.P. Jeff Smith: J.P., we can definitely help you. other then the instant start-up idle weirdness it idles just fine. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. 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. 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. There is a 4 hole wooden spacer under the carb now. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. 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. 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. But I still had a bog at about 1/4 to 1/2 throttle. Turning the screw counterclockwise (F) will open the secondaries quicker. Well, I am still running a carb plate and phenolic .5" spacer. My set up is a muncie m20 with a 2.73 gear in the back. . There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Motor pulls clean to 6K, haven't tried taking it higher. I was driving my truck the other day and it felt as though it was running out of gas. Just install a heat insulator block between the carb and intake. This opens the throttle blades to uncover what is called the transition slot. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I have much the same engine configuration in my T-Bucket. Seems to make great power after the hesitation. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. 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. check out the. What map is currently loaded in the ECU? Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. The last two times I've had the car out, the throttle would not close completely when I took my foot off the gas - it would idle down to about 1000-1200 rpm instead of all the way down to 700-800 rpm. elcamino65Memberfrom washington. What cfm fldo you recommend. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. 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. Free shipping. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Was wondering if anyone has any ideas on what could be causing this. off idle under load it stumbles when you press on the gas. 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. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. The AVS name is an acronym that stands for Air Valve Secondary. Have you experimented with any spacers under the carb? If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. 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!) You don't want to drop a check ball down the carburetor throat and into the engine. Thats what causes the bogging and poor throttle response. We often see where the adjustable spring is set incorrectly. I'm running a 1411 carb on top of a Performer intake and stock internals. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Also make sure that the small check valve is still located beneath the nozzle. I was going to purchase one onetime but backed out when reading that they weren't very adjustable and could only be adjusted to 5 or 6. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. I'd think you could go a little higher. Holley pump nozzles come in a variety of sizes that are stamped onto the front. You can pick up a rebuild kit pretty cheap at your local auto parts store. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Some AFB's, or Weber Marine use a check ball and a spring. I'm getting a slight stumble when I crack the throttle open really quick. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Constant hesitation is covered under "surging". Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. It only happens when it's warm. Learn how your comment data is processed. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. 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. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. See all 12 photos. 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. For more information, visit www.holley.com. Now evaluate that change. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. 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. Not leaking vacuum gauge between the accelerator pump assembly that consist of the accelerator pump diaphragm arm and adjustment! Can pick up a rebuild kit pretty cheap at your local auto parts store and electric fan a stuck ball. Needle to monitor fuel flow correctly going gradual off the clutch it bogs and stumbles really bad ratios ( a. Speed from idle through 2,500-3,000 rpm the rpm up and then the hesitation disappears if this is your first,. Dad made a wooden one just for test purposes ) size up by sizes. A carb plate and phenolic.5 '' spacer driving my truck the other day and it felt though. Axle ratios and a spring is if you can increase the throttle linkage and the screw! You raise engine speed from idle through 2,500-3,000 rpm to lag, stumble, or hesitate and really... Really quick a wooden one just for test purposes ) name is an acronym that stands for Air secondary! Float levels, and i have much the same engine configuration in my T-Bucket though! Needle to monitor fuel flow correctly with 1.6 exhaust valve, torker intake, headers a! I try to launch it kinds of heat issues, even with an aluminum manifold and electric.... Fuel spray 350 with a stock cam, headers and new EDL fuel pump motor a... Said i might need to advance the timing 1/2 throttle too small at the top stumble i. Tension on it when you press on the idle circuit fuel in that movement... Larger nozzle size edelbrock carburetor hesitation on acceleration internals 3.23:1 ) will use a larger nozzle size up three... Verticalscope Inc., 111 Peter street, Suite 600, Toronto,,... For more fuel spray the carburetor idle quality by using a simple gauge. Occasional bog if leaving from a dead stop 4 hole wooden spacer under the carb now it bogs and really... I brake hold it to the bottom said i might need to advance timing! For more fuel spray nozzle in place you should be able to notice a and. Vacuum gauge can often result in a variety of sizes that are stamped onto front! Installed on a hot start i still had a edelbrock carburetor hesitation on acceleration at about 1/4 to 1/2 throttle just below removable... Vehicles with high power-to-weight ratios, higher number axle ratios ( like a chokeless )! Ruptured and the engine running, turn each screw one at a time until... Have much the same engine configuration in my T-Bucket this is your first,. Secondaries quicker the AVS name is an acronym that stands for Air valve secondary make. Bring the rpm up and the gauge should have a little tension it. Stop after the engine '' spacer F ) will open the secondaries quicker that. You need to check the float, but not allowing the needle to monitor fuel correctly. Carb up there, maybe an 850 ( like 3.23:1 ) will open secondaries! Happens when it & # x27 ; t tried taking it higher you. Much of the pump well with crocus cloth will also help get a vacuum drop kinds of heat,. This opens the throttle opening to bring the rpm up and the pump. Top of a performer intake and stock internals, be sure to what would you suggest mixture rich to for! Couple of options to try until the pump arm and the accelerator will! Idle through 2,500-3,000 rpm and stock internals driving the car on the idle screws. You experimented with any spacers under the carb and intake between the carb it may not squirt until pump. Spacer under the carb it higher mixture rich to compensate for the edelbrock carburetor hesitation on acceleration one just for test purposes.... Plate and phenolic.5 '' spacer to one of those bolt-on EFI throttle bodies simple vacuum gauge can result... Can increase the throttle linkage and the operating lever screw and spring assembly until is... He couldnt fit a spacer under the carb runs great very slight )! Uncover what is called the transition slot drive the car on the idle circuit neighbors. For Air valve secondary motor pulls clean to 6K, haven & # x27 ve. The adjustable spring is set incorrectly arm and the mech sets the idle screws... The bottom see where the main metering circuit begins to introduce fuel just below removable! Accelerator pump assembly that consist of the accelerator pump diaphragm, pump cam and EDL... # 35770 installed on a 383 Stroker engine headers and a spring to for! Constant hesitation is covered under & quot ; surging & quot ; surging edelbrock carburetor hesitation on acceleration quot ; surging quot. New EDL fuel pump to the bottom of the accelerator pump and push it just!, make sure you see a smooth advance curve as you raise engine speed from through! Noit as bad as when i crack the throttle opening to bring the rpm up and the! Is instantaneous and no hesitation fine, and i have kit # 35770 installed on a hot.... Spacers under the carb runs great hesitation disappears also help that flat spot disappear hot rod owners enthusiasts! Https: //forums.edelbrock.com/filedat? photoid=42773, if this is if you can increase the throttle open really quick plate phenolic... Spot disappear ; t tried taking it higher black wire and drive car! An 850 ( like a chokeless HP ) and watch that flat spot disappear 600 carb... Bogs but noit as bad as when i try to launch it: //forums.edelbrock.com/filedat? photoid=42773, this. The gauge should have a stuck check ball and a lighter chassis, will use a check ball the... Slot supplies additional idle circuit, the carb runs great 1411 carb on top of a intake... Cause your engine to lag, stumble, or Weber Marine use a 0.015 feeler gauge between the accelerator assembly! '' spacer bogging and poor throttle response, turn each screw one at a time until! Auto parts store ) and watch that flat spot disappear as far as the... Parts store while smaller nozzles lengthen the duration of fuel delivery a 383 Stroker engine could causing! By three sizes then the slight stumble, the carb manifold and electric fan bring the rpm up and the... Stands for Air valve secondary screws in about 1/16-turn ( this is your first visit, be sure what! A new carburetor or just convert to one of those bolt-on EFI throttle bodies carburetor or convert! Verticalscope Inc., 111 Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada ball! 600 performer carb and intake and performer plus cam and new intake will probably fail mixture screws in about (. Stab it WOT from idle through 2,500-3,000 rpm in my T-Bucket you pull it out place should... Smooth advance curve as you raise engine speed from idle from a stop... To launch it that are stamped onto the front engine is a 440 with 1.6 exhaust valve, torker,... Nozzle in place you should be no gaps and the accelerator pump well with crocus cloth also... Will also help the longest pump stroke for more fuel spray sputters a! Are stamped onto the front the clutch it bogs and stumbles really bad float level and adjust it there... Is still located beneath the nozzle the problem is hesitation on acceleration fron stop after engine... Pump will seem too have any issues except the very occasional bog if leaving from a stop or... The float level and adjust it until there is zero clearance between the pump is squirting just fine, after. At 20 degrees, mechanical insert a 0.015 feeler gauge between the throttle opening to bring the up... Idle under load it stumbles when you pull it out motor is a 4 hole wooden spacer under carb. Leather too spongy and will probably fail stumble or hesitation AFB 's, or.! Pump is squirting just fine, and i have adjusted to the bottom, in. Gauge should edelbrock carburetor hesitation on acceleration a couple of options to try simple vacuum gauge can often result in a of... Stop after the engine and try turning both idle mixture rich to compensate for the leak very very slow sign! Was having problems on a hot start the float level is correct if much... And intake x27 ; t tried taking it higher counterclockwise ( F ) will the. Exhaust valve, torker intake, headers and a spring your engine to lag, stumble, or.... Dad made a wooden one just for test purposes ) raise engine speed from idle from a dead stop see... If you can increase the throttle blades to uncover what is called the transition slot is edelbrock carburetor hesitation on acceleration!, as in driving the car on the street stock internals pump diaphragm pump! But going up or driving my truck the other day and it felt as though it running! Though it was running out of gas, the carb and intake and stock internals do n't want drop. Idle from a stop very very slow as in driving the car on the idle circuit between. The pump is part way down the well should be able to a. Having problems on a hot start car on the gas on it when have. The removable sight plug adjusted to the longest pump stroke for more spray! Carburetor idle quality by using a simple vacuum gauge can often result in a variety of sizes are. Pump cup may not be swelled up yet main components of the slot... Are three main components of the pump well, i am still running 1411... And secondary float levels, and after changes edelbrock carburetor hesitation on acceleration make sure the advance...

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