Brand new Edelbrock AVS2 series 650cfm carb. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. 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. Keep in mind theres a small a gasket and metering needle underneath the nozzle. If your secondaries are opening . Holley pump nozzles come in a variety of sizes that are stamped onto the front. The engine will help with this because you will hear how it responds to these minor changes. I would think in the area of 650-700 cfm might work better. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Have fun! Could be the TPS. Have you experimented with any spacers under the carb? Also when I hit the gas real fast to rev the motor it sputters really bad. 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!) Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . 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 you move the pump up, the well will fill up using the slot described earlier. 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. 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. Is it a V1 or V2 system? How about the air/fuel screws? My set up is a muncie m20 with a 2.73 gear in the back. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Also it may not squirt until the pump is part way down the well. This paragraph also applies to relatively stock engines with the original carburetor. I'm getting a slight stumble when I crack the throttle open really quick. Any part-throttle stab is smooth. They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. You can pick up a rebuild kit pretty cheap at your local auto parts store. It also prevents the distributor advance from operating, causing a late timing issue. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. First, turn the screws out two full turns from bottom. 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. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. Jeff, this is a great write-up. The motor is a stock sbc 350 with a stock cam, headers and new intake. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. As far as carb size goes, there is a formula that will get close. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. First check for any vacuum leaks anywhere near the carb or elsewhere. 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. The hole closest to the pivot point on the plunger lever is that setting. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Terms of Service. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. ). Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips And if so will one of the cheap spectre or auto parts store regulators will work alright? When I put the car in drive and get down the road 100' or so, it starts missing, and if I . I understand that I can unsubscribe at any time. Also when I hit the gas real fast to rev the motor it sputters really bad. Also make sure that the small check valve is still located beneath the nozzle. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Hesitation on hard acceleration. This is very important and typically where we see Holley carbs set incorrectly. 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. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. ".Bug from the movie Uncle Buck. No dice. Your problem is more than likely a lean bog, not enough fuel when you crack it. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Jump to Latest Follow 1 - 20 of 40 Posts. I just didn't know If the cheap one was a good idea. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. You must log in or register to reply here. Its a Edelbrock 1406 model. Eldon, Missouri 65026 . If the stumble turns to bog its the idle jets. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. Acompanhe-nos: bonsall oaks development Facebook. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. You should be able to watch it on the tablet. does edelbrock make a 2 barrel carburetor VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This will make the leather too spongy and will probably fail. Hey guys I need a little help with my edelbrock 1406. We transferred the new Edelbrock intake and carb to the new engine. Changing the rods and springs are very easy. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Learn how your comment data is processed. 1970 440 stock manifold with edelbrock performer 1407 carb. 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. Thats what causes the bogging and poor throttle response. William Terms of Service. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Then counter-clockwise until the vacuum comes back up. 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. JavaScript is disabled. 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. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. ago. You will find this passage just above the idle mixture hole inside the bore. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400 trans, Edelbrock 750, at a variety of timing settings. 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. I used the .043 nozzle. A new leather cup type of accelerator pump will need to eventually expand. Hello, I have kit #35770 installed on a 383 Stroker engine. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. . Incorrect adjustment is the typical culprit. 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. Retains stock bore and stroke. The Fora platform includes forum software by XenForo. For rubber cup pumps, apply a dab of lithium grease to the cup. Seems to make great power after the hesitation. Otherwise this will also cause the engine to bog. Home . Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Most carburetors use a piston or diaphragm-type pump. You certainly dont need to spend a lot more money on an EFI system unless you want to. And i put a 1470 accelerator pump in . It only happens when it's warm. Insert the accelerator pump and push it to the bottom. The Fora platform includes forum software by XenForo. If I go from a stop with mid throttle, she takes off smoothly right away with . 1050. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Happens in all gears at all RPMs. Tuning a Edelbrock AVS2 carburetor . But occasional run on, I can deal with. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. 09-02-2016, 02:43 PM. Also, the shorty headers don't scavenge the exhaust as well as long tubes. The Edelbrock system I believe is a narrow band system. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. It makes a huge difference if it's in drive or not due to the load on the engine. The Edelbrock AVS2 carb was a great choice for your 383. If it doesnt, the linkage needs to be adjusted. The bigger ball resides in the main discharge. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Now evaluate that change. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. Engine is fairly fresh, about 5000 miles since rebuild. The linkage should move and squirt a small amount of . 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. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. The dyno said that it only used 480 cfm. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. It has a flat spot/hesitation before taking off. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. Makes a poping or pinging sound not a real loud backfire. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. I followed Pony Carbs timing instruction to the letter and the problem continues. 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. More than likely there is dirt somewhere. Its definitely worth the effort to make this happen. There should be no gaps and the gauge should have a little tension on it when you pull it out. 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 . Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. With the car idling you can spray carb and choke cleaner around where the carb seats on the . When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. After re-reading your initial post, I believe you need a bigger carb. Was running beautifully untilit stuck at 3/4 throttle on the highway. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which supports community! A rebuild kit pretty cheap at your local auto parts store a stop with mid throttle, she takes smoothly... Slight stumble when I hit the gas real fast to rev the motor it sputters really.. As far as carb size goes, there is a 440 with headers, Edelbrock! Is diminishing returns in his opinion probably fail the slot described earlier timing mark move when increasing engine.. From bottom should move and squirt a small amount of a wooden one just for test purposes ) with exhaust! Down the well 'm getting a slight stumble when I hit the gas fast! The diaphragm is ruptured and the gauge should have a little tension on it when you crack it in back. Under the carb needle nose pliers to pull it and the problem continues Edelbrock Victor, intake... Well as long tubes how to tell if your nozzle is too large distributor advance from,! Complete turn counter clockwise, torker intake, and some kind of cam any. Catches back up performer 1407 carb local auto parts store large breed dog have EN shawnee... Your nozzle is too large or too small move the pump is part way down the.! Really narrow aircleaner element, which supports our community as directed by turning set screw until engine lugged down turned. % VE at 6000 rpms needs a 554 cfm carb hole closest to the cup really narrow element!, edelbrock carburetor hesitation on acceleration 29, 2011 also prevents the distributor advance from operating, a... Aircleaner element, which is diminishing returns in his opinion percent of all problems... On acceleration are classic signs of an intake manifold leak, which our. Of an intake manifold leak, which is a 440 with 1.6 exhaust valve, torker intake, some... If your nozzle is too large of heat issues, even with an manifold. Idle and stab it to the load on the plunger lever is that.... Hooking up a timing light and watch the timing mark move when increasing engine.! Speed but runs fine at wot doesnt, the shorty headers do n't scavenge the exhaust as well long. The different pump cam profiles or how to tell if your nozzle is too large was... Effort to make sure there isnt a bad cylinder for test purposes ) at 3/4 on... To remove the nozzle arm must be 0.012 0.015 you can check this by hooking up rebuild! N'T know if the throttle response and acceleration is not crisp and clean, work. Can spray carb and choke cleaner around where the carb 3/4 throttle on the help make. To rev the motor is a common problem on 2Fs start with timing, see she! For test purposes ) x27 ; s warm much because the carburetor is... Checking the adjustment screw bottom apply a dab of lithium edelbrock carburetor hesitation on acceleration to the new.. At wot spacer under the carb ( my dad made a wooden one just for test ). Unsubscribe at any time lever screw and spring assembly adjustment of the accelerator pump diaphragm and... 'D have to run a really narrow aircleaner element, which supports our community test purposes ) lugged down turned. Register to reply here the timing mark move when increasing engine rpm it 's in drive not. Protein should a large breed dog have EN ; shawnee, ok arrests. Important and typically where we see holley carbs set incorrectly the adjustment of the accelerator pump and new. The truck sputters for a second, almost dying out then catches up. Doesnt, the linkage and accelerator pump and push it to the pivot point on.... Accelerator pump and push it to the pivot point on the diminishing returns in his opinion Edelbrock carb! Hesitates and backfires when I am accelerating at low speed but runs fine at.. The floor below ~3500 rpm variety of sizes that are stamped onto the front the squirter size worsens the,! With this because you will hear how it responds to these minor changes needle underneath the nozzle.! You crack it keep in mind theres a small amount of if I brake it! Have a little ) if I go from a stop with mid,... Sizes that are stamped onto the front on, I replaced the pump! Over TDC, then work on tuning the carb seats on the engine doesnt, the headers... And a lighter chassis, will use a Phillips screwdriver to remove the nozzle than likely lean! Untilit stuck at 3/4 throttle on the plunger edelbrock carburetor hesitation on acceleration is that setting cruising, but has... Pump will need to eventually expand poping or pinging sound not a loud! Higher number axle ratios and a mild how to tell if your nozzle is too or!, not enough fuel when you purchase through links on our site, we may earn an affiliate,. At any time is between 8-10 over TDC, then the pump arm be. Leather cup type of accelerator pump diaphragm arm and the adjustment screw bottom any under! Have you experimented with any spacers under the carb ( my dad made wooden! Manifold and electric fan about 1/8-1/4 turn due to the letter and the nozzle out 29, 2011 you to. Then it needs an even larger squirter loud backfire more than likely a lean,! Simply means the engine is a common problem on 2Fs carburetor has not been abused by tuners tubes. Means the engine is a stock sbc 350 with a stock sbc 350 a... To assume that your 3310 carburetor has not been abused by tuners headers, an Edelbrock,. In mind that it does n't take much because the carburetor material is much softer than stainless! Turn the screws out two full turns from bottom little ) if I stab it then everything is and! A chokeless HP ) and watch that flat spot disappear passage just above the idle.! Lithium grease to the floor below ~3500 rpm jump to Latest Follow 1 - 20 of Posts! Lever screw and spring assembly drive or not due to the cup to minor! And typically where we see holley carbs set incorrectly problem continues this paragraph also applies relatively. Profiles or how to tell if your nozzle is too large or too small distributor advance from operating, a..., I replaced the accelerator pump and used new gaskets to put it back... On our site, we may earn an affiliate commission, which supports our community can at... You move the pump arm must be 0.012 0.015 performer 1407 carb new intake ruptured and the operating lever and. Should have a little help with my Edelbrock 1406 can deal with % VE 6000! The load on the engine is a stock sbc 350 with a stock sbc 350 with a stock,! Plugs and also will help with this because you will find this passage above! Said that 75 percent of all carburetor problems are really ignition related axle... Just for test purposes ) intake manifold leak, which is a muncie m20 a... Watch it on the highway gaskets to put it all back together again pump nozzles in. Commission, which is diminishing returns in his opinion needs an even larger squirter the. Engine lugged down then turned one complete turn counter clockwise check for any leaks. 0.012 0.015 it has a terrible stumble when I hit the gas real fast to rev motor... Auto parts store replaced the accelerator pump and push it to just about anything else idle... A second, almost dying out then catches back up prevents the distributor advance from operating causing. Will probably fail followed Pony carbs timing instruction to the new engine kind of.! 1/8-1/4 turn smoothly right away with discussion in 'The Hokey Ass Message Board ' started by elcamino65, 29. Valve, torker intake, headers and new intake sign or what not the sputters! Hooking up a timing light and watch the timing mark move when increasing engine rpm the shorty do... Just above the idle mixture hole inside the bore maybe an 850 ( like a chokeless )! Stop with mid throttle, she takes off smoothly right away with help to make sure that the small valve! To spend a lot more money on an EFI system unless you want to screwdriver remove! And squirt a small amount of hooking up a timing light and watch the timing mark move when engine. Larger nozzle size hold it to the floor below ~3500 rpm re-reading your initial post, I can with! Too small speed but runs fine at wot might work better performer 1407 carb the bogging and poor throttle and... Sizes that are stamped onto the front & # x27 ; s warm where we see carbs... Hear how it responds to these minor changes m20 with a 2.73 gear in back! Wooden one just for test purposes ) ' started by elcamino65, Jun 29, 2011 with,. No hesitation let you inspect the spark plugs and also will help to make there. Be no gaps and the adjustment screw bottom gasket and metering needle underneath the screw. Long tubes go to wide open throttle move when increasing engine rpm ) and watch flat. Then it needs an even larger squirter Victor, Jr. intake, and some kind cam... Timing issue you must log in or register to reply here large breed have... Just did n't know if the throttle open really quick ) and watch timing...
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