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. 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. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; I'm having off-idle stumble and there's a stumble when the secondaries come in. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Edelbrock Carburetor . They also left out the transition circuit. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. This paragraph also applies to relatively stock engines with the original carburetor. We often see where the adjustable spring is set incorrectly. I like the sound of bumping the timing. 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. Another thing, get a vacuum guage to tune your mixture screws with. May 22, 2010. 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. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! Your email address will not be published. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. ".Bug from the movie Uncle Buck. See all 12 photos. I have he edelbrock 600 elec choke performer carb. Notify me of follow-up comments by email. 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. Your carb should have an instruction book on how to adjust it. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. Jeff, this is a great write-up. . Stay up to date with the latest releases, events, promotions and more. 04-20-2010, 09:42 AM. 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. Re: Hesitation when giving 'er the throttle Thanks for all the information. Dec 14, 2001. That's the very reason I switched. Any suggestions? As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. She stumbles and hesitates under normal acceleration. At normal cruising no backfiring. 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. Loom the wires to keep them far enough away from the header pipes as possible. An indication of this would be to see gas dribbling out of the main discharge at idle. Warm the engine to operating temperature. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. 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. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. We transferred the new Edelbrock intake and carb to the new engine. If I go from a stop with mid throttle, she takes off smoothly right away with . May 13, 2014 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 . This will cause your engine to lag, stumble, or hesitate. 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 too had bog problems with my 1406. 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. This will help lubricate the well. J.P. Jeff Smith: J.P., we can definitely help you. 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. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. 1406 sounds a little small for your mods. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. Just install a heat insulator block between the carb and intake. do koalas have poisonous claws. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. That should not happen. For a better experience, please enable JavaScript in your browser before proceeding. Also make sure you floats are set correctly while youre in there. elcamino65Memberfrom washington. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. My temp has been 185-190 consistently at idle and on the road. ). Motor pulls clean to 6K, haven't tried taking it higher. Privacy Policy. First, turn the screws out two full turns from bottom. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Thanks for you're input. The pump needs a smooth gliding surface. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Also when I hit the gas real fast to rev the motor it sputters really bad. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Next test is to see if the discharge check is working. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. No fuel coming out means you have a restriction between the pump well and the main discharge. Edelbrock carb stumble,hesitation,bog. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. Be careful not to loosen the check valve needle that sits under the nozzle. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. . 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. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Is it a V1 or V2 system? The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. sggoat, ErikinSC and Solace in Solitude. Shoot for the highest vacuum and Rpms. Keep in mind theres a small a gasket and metering needle underneath the nozzle. Good job. That makes good sense. 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. As you move the pump up, the well will fill up using the slot described earlier. Krawk101 8 mo. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Now evaluate that change. Increasing the idle jets in the metering block solves this issue. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. Jump to Latest Follow 1 - 20 of 40 Posts. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. 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. The linkage should move and squirt a small amount of . Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. 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. #3. What would you suggest? 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. You dont need to drill throttle plates. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Location. 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. Was wondering if anyone has any ideas on what could be causing this. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? 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. There should be no gaps and the gauge should have a little tension on it when you pull it out. 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. The dyno said that it only used 480 cfm. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. 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. I've done it, resulting in removing the engine head and/or intake to remove the part. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. 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!) If they are way off, thats good. 302 bog/hesitation. Set them both the same at about 1 turns counterclockwise from fully seated. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. If you don't know what an accelerator pump is, it's a squirt gun for fuel. 1050. Holley pump nozzles come in a variety of sizes that are stamped onto the front. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. I reset my timing, insulated some fuel line and it has been running great. We will discuss two types of bog: the . Let us know what happens. 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. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. What is your fuel pressure on the tablet? Make sure you have the accelerator pump shot at the max discharge position. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. 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. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). What should it be?^^. For a better experience, please enable JavaScript in your browser before proceeding. Its a Edelbrock 1406 model. I just don't really have any reason to stab it WOT from idle from a dead stop. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. For a better experience, please enable JavaScript in your browser before proceeding. 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. does edelbrock make a 2 barrel carburetor 19 3407 . 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. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. As far as carb size goes, there is a formula that will get close. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. I have much the same engine configuration in my T-Bucket. A new leather cup type of accelerator pump will need to eventually expand. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. Finally a little follow-up. The pump well is tapered and the accelerator pump will seem too small at the top. When I first start the engine it runs great, and idels in great. $385.95. 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. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. The Fora platform includes forum software by XenForo. Comp Cam -4 hydraulic flat tappet.