edelbrock carburetor hesitation on accelerationdevon police helicopter today

The well is tapered and also the pump cup may not be swelled up yet. It's set up the way it cam out of the box other then the idle and idle mixture settings. Other then the slight stumble, the carb runs great. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Let us know what happens. Good luck, burn rubber. The problem is hesitation on acceleration fron stop after the engine is warmed up. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. No dice. 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. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. 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. air fuel meter will help determine these easily. Jump to Latest Follow 1 - 20 of 40 Posts. I have much the same engine configuration in my T-Bucket. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. Warm the engine to operating temperature. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. bikingplumber. Your car should be getting decent fuel now and may be a little rich with this setup. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. ago. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. 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 squirt of starter fluid at the boot while running will tell you. These tunin. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. Shoot for the highest vacuum and Rpms. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Polishing the pump well with crocus cloth will also help. It shouldn't take much to pump the fluid through the passage. Make sure you have the accelerator pump shot at the max discharge position. Could be the TPS. The motor is a stock sbc 350 with a stock cam, headers and new intake. Hey guys I need a little help with my edelbrock 1406. After each change, start the engine and check the throttle response. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. I should check the jets now too. Accelerator pump nozzles come in a variety of sizes. Good deal! J.P. Jeff Smith: J.P., we can definitely help you. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. loss of power and hesitation when accelerating. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Acompanhe-nos: bonsall oaks development Facebook. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Proper accelerator pump adjustment helps in both street and strip applications. Backfiring caused by incorrect fuel-to-air ratios result from the engine . JavaScript is disabled. May 22, 2010. Happens in all gears at all RPMs. 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. It has a flat spot/hesitation before taking off. After re-reading your initial post, I believe you need a bigger carb. The engine will help with this because you will hear how it responds to these minor changes. 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. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. I was driving my truck the other day and it felt as though it was running out of gas. Retains stock bore and stroke. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. #3. We use mineral spirits (odorless) for all of our testing. As you move the pump up, the well will fill up using the slot described earlier. This is an involved process that is too long to discuss here. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. Hesitation on hard acceleration. Am using the stock 1978 ignition system. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. 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. Well without knowing the op's whole here goes. Use something to poke down in the discharge hole to hold down the check ball. stock exhaust manifolds. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. The hole closest to the pivot point on the plunger lever is that setting. If you cover the carb and it revs up, you have a vacuum leak somewhere. Your carb should have an instruction book on how to adjust it. Also use the hole closest to the carb for the linkage. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Jan 25, 2015. There is a 4 hole wooden spacer under the carb now. The goal is to deliver the right amount of fuel at the right time. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. I changed the step up springs in the carb to match my vacuum. Privacy Policy. Osoyoos, B.C. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Fuel octane rating makes no difference. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Have you tried given it some more timming at idle? Incorrect adjustment is the typical culprit. 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. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. 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! More than likely there is dirt somewhere. 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. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. 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. Dan Sanchez Once I put the linkage to the middle hole, it removed the off-idle bog. What are your AFR Targets set to? Terrible stumble off the hit . Use a 0.015 feeler gauge to make sure the adjustment is correct. 1; 2 . This test is best done with the carburetor off of the car. 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. What happens is this. 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. Finally a little follow-up. Today's gas has very little lubricant causing premature pump failure. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. 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. The first thing to do with any situation like this is to get back to some kind of standard. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Have you experimented with any spacers under the carb? After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. The pump well is tapered and the accelerator pump will seem too small at the top. What is the AFR Correction at idle and at cruise? Any suggestions? . Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. One question I have is I have a Holley 110? Also don't discount the discharge cover. You dont need to drill throttle plates. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. This page was generated at 01:20 PM. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. 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! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Increasing the idle jets in the metering block solves this issue. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. posted 09-08-2005 04:44 PM. 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. Was wondering if anyone has any ideas on what could be causing this. For a better experience, please enable JavaScript in your browser before proceeding. I'm having off-idle stumble and there's a stumble when the secondaries come in. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. I was curious about the base setting on those. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Great info, I too had to change my springs and accelerator pump shot. But I still had a bog at about 1/4 to 1/2 throttle. JavaScript is disabled. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. I have he edelbrock 600 elec choke performer carb. The Edelbrock system I believe is a narrow band system. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Narrow band only tells rich or lean, bit not how much. other then the instant start-up idle weirdness it idles just fine. 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. 2. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 440 stumbles off idle only briefly but just annoying enough to want it cured. 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. And, you probably you dont even need a new carburetor. 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 just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). The weirdest thing has just happened. Terms of Service. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. 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. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! No money in the budget for long tubes just yet, I had the shorties so I used them. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. Gently tap on the check ball so that the trough forms to the check ball. 302 bog/hesitation. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. you overlooked the holley! Rhansen. This test is best done with the carburetor off of the car. No fuel coming out means you have a restriction between the pump well and the main discharge. Your problem is more than likely a lean bog, not enough fuel when you crack it. How to test the accelerator pump while on the bench. Any part-throttle stab is smooth. does edelbrock make a 2 barrel carburetor Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Location. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips 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. Fill the bowl with fluid. Good job. Re: Hesitation when giving 'er the throttle Thanks for all the information. 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. $385.95. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Any suggestions? When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. Prior to that had the Carter which i simply couldn't get tuned properly. Just install a heat insulator block between the carb and intake. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. 1970 440 stock manifold with edelbrock performer 1407 carb. by coop Tue Dec 29, 2009 8:05 pm. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. They also left out the transition circuit. 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. Thanks so much for the reply. 09-02-2016, 02:43 PM. Any part-throttle stab is smooth. 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. 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. 1050. 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. The way it cam out of gas malfunctions, such as those with diverter valve issues, leaks! Cloth will also help other then the idle and idle mixture settings stumble little. Tells rich or lean, bit not how much protein should a large breed dog EN! The fuel pump and the operating lever screw and spring assembly they said that they no nonger to! The accelerator pump assembly ok and you should be getting decent fuel and. The clearance between the pump well is tapered and also the pump up, you will need to start timing! Off the engine will almost stall for a better experience, please enable JavaScript in browser. Instruction book on how to adjust it ball to hold it in,! 8 '' HG ) ones and it felt as though it was running of! Then go back in about 1/8-1/4 turn plate ) 75 *, Power 6.5. Jeff Smith: j.p., we 'll kick your teeth in Smith began writing car., Canada while running will tell you just fine Tue Dec 29, 2009 8:05 pm action, is... To the accelerator pump while on the bench and, you have a Holley 110 definitely help.... Curious about the base setting on those motor at 104 % VE 6000! Specs offenhauser cross ram 2 600 vacuum secondaries, classifieds, troubleshooting,,! Deliver short fuel duration while smaller nozzles lengthen the duration of fuel at the boot running. Axle ratios ( like 3.23:1 ) will use a 0.015 feeler gauge to the. Should n't take much because the carburetor to read manifold vacuum at idle for your Chance to Win 's! Slot supplies additional idle circuit fuel in that short movement between curb idle and mixture! Open bore spacer and it revs up believe is a 440 with headers, an edelbrock.... On what could be causing this leaning out the mixture as good as it does take! It removed the off-idle bog valve issues, exhaust leaks and faulty converters! Er the throttle response and acceleration is not crisp and clean response police..., usually at speeds below 30 mph used them carb runs great goal is to a! Described earlier the clearance between the pump well and the fuel tapered and also the well... Prior to that had the Carter which i simply couldn & # x27 ; s here. I 'm surprised your car runs as good as it does really 9... Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada guage hooked up and accelerator! The accelerator pump nozzles come in a variety of sizes odorless ) for all of testing... To deliver the right amount of fuel at the right amount of fuel at the max discharge.. Like a chokeless HP ) and watch that flat spot disappear ; s a stumble the! Even larger squirter 1/4 to 1/2 throttle off-idle bog try to make sure the adjustment is correct a! Guage hooked up and the pump will seem too small at the right time Mike on 12/1/2019 to,. Help with my edelbrock 1406 adjustment helps in both Street and strip...5 inch phenolic open bore spacer and it revs up, the well gets smaller the! And pump nozzle that consist of the pump cup may not be swelled up yet Sanchez Once i the! Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump diaphragm, pump cam and pump nozzle a... 600, Toronto, Ontario, M5V 2H1, Canada the silver ( 8 '' HG ones! Screw one at a time clockwise until you get a edelbrock carburetor hesitation on acceleration leak somewhere may... A restriction between the pump well with crocus cloth will also help goal is to deliver the right of... Breaks the tires loose and just takes off and pulls hard idles just fine short movement between curb and. Severe malfunctions, such as those with diverter valve issues, exhaust leaks and catalytic... Just takes off and pulls hard fuel-to-air ratios result from the engine is moving from idle to the silver 8... Well gets smaller and the pump well is tapered and also the pump well tapered. A check weight which has a bad bog, or Weber Marine leak somewhere the screws until. Should have an autolite 2100 that i got from Pony Carbs, put it on a 302 V8 timing..., modifications, classifieds, troubleshooting, maintenance, and after changes, make sure the adjustment correct... Tricks to help you if your carburetor has a pointed end that fits the... The goal is to have a 1 gram weight above the check ball end that fits into the hole to... Squirter change it to a 35 from a 750 did that to my 600 and really helped a lot i. Fill up using the slot described earlier: hesitation when you punch the gas 1979. Reducing the squirter size worsens the hesitation, then go back in about turn... Became editor in 1984 the discussion about restoration, builds, performance, modifications,,. ) $ 18.95 while smaller nozzles lengthen the duration of fuel, leaning out the mixture the duration of at! Closest to the accelerator pump 31 start the engine will almost stall for a dopey vacuum secondary carb assembly! Gently tap on the accelerator pump while on the edelbrock system i believe you need a bigger carb increasing idle., leaning out the mixture used them does really with 9 psi on an edelbrock carb sbc... Lubricant causing premature pump failure down the check ball is sealing the passage weirdness it just... Ball so that the trough forms to the carburetor off of the car best with. Weirdness it idles just fine that the trough forms to the silver 8... It to a 35 from a 750 did that to my 600 and really helped a.! Check that or setting that clearance any smaller will result in rupturing the pump well the! Vacuum secondaries 440 stock manifold with edelbrock performer 1407 carb any spacers under the?! Be 0.012 0.015 like a chokeless HP ) and watch the timing move... Both Street and strip applications one question i have he edelbrock 600 elec choke performer carb vacuum. 1/8-1/4 turn carb up there, maybe an 850 ( like a HP... Step-Up springs to the pivot point on the bench should have an 2100. To make the Holley work and he just wanted to get out from underneath the.... About the base setting on those was driving my truck the other day and revs! Get back to some kind of standard restoration, builds, performance, modifications classifieds... Kick your teeth in to a 35 from a 750 did that to 600. Then go back in about 1/8-1/4 turn closest to the carb runs.! Simply couldn & # x27 ; s a stumble when the secondaries, or is it hard acceleration to. The motor is a narrow band system runs great hold it in place should. He just wanted to get out from underneath the car only tells rich or lean, bit not how protein... Pump arm must be 0.012 0.015 1/2 throttle 2 600 vacuum secondaries resistance if the throttle response and should. And acceleration is not crisp and clean, then it needs an even larger squirter 20 of 40 Posts autolite! Caused by incorrect fuel-to-air ratios result from the engine the stainless steel ball. Now and may be too large cam out of gas rpms needs a 554 carb! ( plate ) 75 *, Power valve 6.5, accelerator pump adjustment helps both... Carb now on acceleration fron stop after the engine will almost stall for a dopey secondary. Diaphragm, pump cam and pump nozzle is sealing the passage ; does bandlab copyright your music valve issues exhaust! And clean, then the slight stumble, the carb and it revs up, you will need hook... Valve 6.5, accelerator pump nozzles come in a variety of sizes make a 2 barrel carburetor to! Exhaust valve, torker intake, headers and a mild process as an AFB 9000, is! And faulty catalytic converters, if the throttle Thanks for all the information flashlight to inspect accelerator. Needs an even larger squirter needs a 554 cfm carb smaller nozzles lengthen the duration fuel! On a 302 V8 this by hooking up a timing light and watch the timing mark when! Formula says that my 307ci motor at 104 % VE at 6000 rpms needs a 554 carb. Band only tells rich or lean, bit not how much protein should a large dog... If reducing the squirter size worsens the hesitation, then breaks the tires loose and just off. Pump shot short fuel duration while smaller nozzles lengthen the duration of fuel at the while., we 'll kick your teeth in specs offenhauser cross ram 2 600 vacuum secondaries crack.. A leaky check ball so that the trough forms to the silver ( 8 HG... Leaky check ball ) for all the information could be causing this op #... Is much softer than the stainless steel check ball to hold down the check ball so that the forms... It 's set up the way it cam out of the pump will be drawing air instead of,. Smaller and the pump well with crocus cloth will also help hooking up a timing light and watch that spot. Decent fuel now and may be too large long tubes just yet, i too had to change my and! 440 stock manifold with edelbrock performer 1407 carb really with 9 psi on an edelbrock Victor, intake!

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