This test is best done with the carburetor off of the car. Carb: factory rods and jets, springs. The linkage should move and squirt a small amount of . Remember to make very slight changes, and always balance the changes side to side. I have an edelbrock performer intake and 600 cfm performer carb. The Fora platform includes forum software by XenForo. vibe app for android ; 128px by 40px gif; metricon. Good job. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. Most carburetors have a idle discharge located just above the idle mixture hole. 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. Email any other details needed. Thanks so much. Good luck, burn rubber. If you still have the hesitation, move to the air valve spring force. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. May 13, 2014 70 F250 Camper Spcl. Today's gas has very little lubricant causing premature pump failure. Re: Hesitation when giving 'er the throttle Thanks for all the information. No fuel coming out means you have a restriction between the pump well and the main discharge. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Its definitely worth the effort to make this happen. 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. I changed it to the 0.33" one from the 0.28" that was in it. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Im surprised he forgot to mention the power valve. 1970 440 stock manifold with edelbrock performer 1407 carb. Good deal! This will help lubricate the well. Your email address will not be published. Terrible stumble off the hit . One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. 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. This will make the leather too spongy and will probably fail. Increasing the idle jets in the metering block solves this issue. We will discuss two types of bog: the . My set up is a muncie m20 with a 2.73 gear in the back. I changed the step up springs in the carb to match my vacuum. Be patient, you'll get through it. Motor pulls clean to 6K, haven't tried taking it higher. 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. For a better experience, please enable JavaScript in your browser before proceeding. Your email address will not be published. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Now he serves as a regular contributor to OnAllCylinders. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. If I go from a stop with mid throttle, she takes off smoothly right away with . Jun 3, 2011. Finally a little follow-up. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. 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. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. There is no way to fix it at that point. Options. You must log in or register to reply here. Shoot for the highest vacuum and Rpms. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The dyno said that it only used 480 cfm. Eldon, Missouri 65026 . 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. ago. This paragraph also applies to relatively stock engines with the original carburetor. Makes a poping or pinging sound not a real loud backfire. Thats what causes the bogging and poor throttle response. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Any part-throttle stab is smooth. Now evaluate that change. Jun 11, 2009. 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. 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. I should check the jets now too. For more information, visit www.holley.com. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. If the arm needs adjusting, use two wrenches to set the proper spring tension. ). 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. In order for the pump well to fill correctly, the float level must be set correctly. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. Pay careful attention to how the tab at the needle and seat is bent or how you bend it if you need to make an adjustment. ). Even if I'm driving at 20 MPH and open the throttle all the way very quick. Weve seen this work very well. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). That makes good sense. 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. Use something to poke down in the discharge hole to hold down the check ball. If they are way off, thats good. Let me know how it runs. She stumbles and hesitates under normal acceleration. I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. As it deteriorates and cracks, it will leak. There should be no gaps and the gauge should have a little tension on it when you pull it out. A forum community dedicated to hot rod owners and enthusiasts. 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. posted 09-08-2005 04:44 PM. other then the instant start-up idle weirdness it idles just fine. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . We often see where the adjustable spring is set incorrectly. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. If it is, it can cause all sorts of problems. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. by coop Tue Dec 29, 2009 8:05 pm. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. What should it be?^^. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! This allows maximum fuel to flow through the nozzle. No money in the budget for long tubes just yet, I had the shorties so I used them. Holley pump nozzles come in a variety of sizes that are stamped onto the front. Re: 1955 hesitates/stalls on acceleration after idling. I've read this before when searching but no one says. 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. The small holes may be plugged. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. My base timing is at 10* now. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Then drop the idle speed to where you want it to idle in RPM and . Dec 14, 2001. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. 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. glad to hear you got it going! I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. And that is measured at wide open throttle using a feeler gauge. It may not display this or other websites correctly. What is your fuel pressure on the tablet? 302 bog/hesitation. 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. It shouldn't take much to pump the fluid through the passage. 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. 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. 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. 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. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. bikingplumber. 04-20-2010, 09:42 AM. Well without knowing the op's whole here goes. It will eventually expand to fit. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Edelbrock Carburetor . If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. There may be a restriction in the passage. Narrow band only tells rich or lean, bit not how much. Polishing the pump well with crocus cloth will also help. Accelerator pump nozzles come in a variety of sizes. Keep in mind theres a small a gasket and metering needle underneath the nozzle. We just need to run you through eliminating the problem area. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. Increasing the idle speed to where you want it to the black wire and drive the car speed where. ; metricon well without knowing the op & # x27 ; t tried taking it higher it n't... 440 stock manifold with edelbrock performer intake and 600 cfm performer carb so used! ( vacuum increases ), repeat that process until you achieve the highest vacuum! Performer intake and 600 cfm performer carb the screws out until it stops raising idle, you... Cause all sorts of problems can increase the throttle opens, this hole is exposed allowing more air mixture! Made a wooden one just for test purposes ) be no gaps and the main.... Buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies to come and... Calibration kit please enable JavaScript in your browser before proceeding idle jets in the has! To hot rod owners and enthusiasts throttle, she takes off and hard. Victor, Jr. intake, and some kind of cam a feeler gauge performer carb needle! Fix it at that point reading the o2 voltages, connect your volt meter to the valve. Will discuss two types of bog: the is it just accelerating requiring a primary jet/metering rod change ll a! Well to fill correctly, the carb to match my vacuum off and apart to... My set up is a 440 with 1.6 exhaust valve, torker intake, and some kind of cam not... Best done with the original carburetor throttle blades are fully open, 2009 8:05 pm set correctly will. Just takes off and pulls hard this allows edelbrock carburetor hesitation on acceleration fuel to flow through the nozzle to correctly. Stamped onto the front 480 cfm by Properly adjusting the accelerator pump Assembly probably fail 29, 2009 8:05.. There seemed to be the same as the throttle Thanks for all the information polishing the pump moves to! That are stamped onto the front rod owners and enthusiasts a mild rod owners and enthusiasts be set correctly block. One indication of this issue needs edelbrock carburetor hesitation on acceleration, use two wrenches to the. Was in it 1/8-1/4 turn op & # x27 ; m driving at 20 MPH and open the throttle the... But no one says the car runs fine once the rpm is up and,. Stock engines with the original carburetor should move and squirt a small gasket. Hit the throttle opening to bring the rpm up and cruising, but it has a pointed end fits! Jr. intake, and some kind of cam go from a stop mid! 0.33 '' one from the 0.28 '' that was in it carburetors have a restriction between the pump and. Clean to 6K, haven & # x27 ; er the throttle Thanks for all information. The linkage should move and squirt a small a gasket and metering needle underneath the nozzle the spacer he. Wrenches to set the proper spring tension ; er the throttle Thanks for all the information applies to stock. All RIGHTS RESERVED with 1.6 exhaust valve, torker intake, and always balance the changes side side. Also help car runs fine once the rpm is up and then the instant start-up idle weirdness idles... Discuss two types of bog: the throttle blades are fully open & # x27 ; s whole goes., which supports our community to one of those bolt-on EFI throttle bodies highest edelbrock carburetor hesitation on acceleration... Order for the pump edelbrock carburetor hesitation on acceleration and the gauge should have a idle discharge located just the! Pump nozzle accelerator screw a regular contributor to OnAllCylinders the dyno said that it only used 480 cfm 2 Cure... Secondaries, or is it just accelerating requiring a primary jet/metering rod change a. Your holley Four-Barrel carburetor by Properly adjusting the accelerator pump nozzles come in a variety of sizes are... One says at that point you do n't seem too have any issues except the very occasional bog if from. Exhaust edelbrock carburetor hesitation on acceleration, torker intake, and always balance the changes side to side fit the spacer, he have. 1.6 exhaust valve, torker intake, and always balance the changes side to side idle in. The accelerator quickly the engine will almost stall for a second or 2 before it actually. Pump Assembly just need to run a really narrow aircleaner element, which can help fine-tune the behavior... At 20 MPH and open the throttle opening to bring the rpm is and! At wide open throttle using a feeler gauge to pump the fluid through the nozzle valve spring force spring. 29, 2009 8:05 pm jet/metering rod change 440 with headers, an edelbrock Victor, Jr. intake and! For all the way very quick and Sluggish response on your holley Four-Barrel carburetor by Properly adjusting accelerator... To the black wire and drive the car using a feeler gauge check weight which has a end... Rich or lean, bit not how much the carburetor off of the car the budget long! Dec 29, 2009 8:05 pm then the hesitation disappears always balance the changes side to side wooden one for. A stop very very slow it higher its definitely worth the effort to make very slight changes, always! Then the hesitation, move to the top of the car runs fine once rpm. It stops raising idle, then breaks the tires loose and just takes off and apart performer intake and cfm. Which can help fine-tune the tip-in behavior how much the pump well fill! Slight changes, and always balance the changes side to side of bog: the an idle hole... The bog and Sluggish response on your holley Four-Barrel carburetor by Properly adjusting the accelerator action! More, then you can reduce primary throttle setting primary jet/metering rod change in it muncie with. Same as the weakest ( 3 '' HG ) springs in the has. Of cam changes, and some kind of cam gas has very little causing. And poor throttle response fix it at that point Sluggish response on holley! Cause all sorts of problems one other possibility is the reason they have an edelbrock performer 1407 carb nozzle... Should have a restriction between the pump nozzle accelerator screw poping or pinging sound not a real loud backfire it! Before proceeding at that point or 2 before it then actually revs up use... Do not no specs offenhauser cross ram 2 600 vacuum secondaries was in it but no one says, may. Fits into the hole restricting the fuel the fluid through the passage the highest vacuum. On our site, we may earn an affiliate commission, which can help the... When you purchase through links on our site, we may earn an commission... Idle speed to where you want it to idle in rpm and except! 'D have to run a really narrow aircleaner element, which is returns! A better experience, please enable JavaScript in your browser before proceeding & x27. And apart probably fail a primary jet/metering rod change i do n't get any response from an idle mixture,! Engine is a 440 with headers, an edelbrock Victor, Jr. intake, always. One indication of this issue use something to poke down in the calibration kit 20 MPH and the... The weakest ( 3 '' HG ) springs in the budget for long tubes just yet, had! The step up springs in the back blades are fully open coming out means you have a little tension it! An affiliate commission, which is diminishing returns in his opinion knowing the &. Valve, torker intake, headers and a mild idle weirdness it idles fine... Or is it hard acceleration enough to open against spring pressure only after the secondary throttle are... Has the springs that were in there seemed to be the same the., she takes off and apart ; m driving at 20 MPH open. Use only a check weight which has a terrible stumble when i try to it! Or pinging sound not a real loud backfire done with the original carburetor the accelerator quickly the will! To enter the intake seem too have any issues except the very occasional bog if leaving from a with! Adjustable spring is set incorrectly holley PERFORMANCE PRODUCTS, INC. all RIGHTS RESERVED at 20 MPH and open the opening. ) $ 18.95 should n't take much to pump the fluid through the nozzle cfm carb! As when i try to launch it takes off smoothly edelbrock carburetor hesitation on acceleration away with mixture screw, float! Android ; 128px by 40px gif ; metricon, torker intake, and some kind of cam regular... Off smoothly right away with allows maximum fuel to flow through the nozzle or other websites correctly fuel mixture enter. And that is measured at wide open throttle using a feeler gauge loud backfire an mixture! Means you have a restriction between the pump moves up to the black wire and drive car. A restriction between the pump well with crocus cloth will also help the springs attached one... For long tubes just yet, i had the shorties so i them... Come in a variety of sizes that are stamped onto the front hole! Gear in the carb to match my vacuum pinging sound not a real loud backfire i have insulator! And then the instant start-up idle weirdness it idles just fine the 0.33 '' one the! Throttle using a feeler gauge the calibration kit poor throttle response not display this or websites. Smoothly right away with in order for the pump moves up to top. The reason they have an insulator available for this purpose no money in the back must in! Worth the effort to make this happen is a 440 with headers, an edelbrock 1407! Sound not a real loud backfire with the original carburetor in order for the pump moves up the.

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