The idle is set at 900rpm without vaccume advance plugged in. Guide, Boat Also check the choke pull off diaphram and vacuum advance can for leaks. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. Another important issue with Quadrajets is carburetor sizing. Racks, Fish Finders, Sounders That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. Fuel metering became electronically controlled in 1980. That 2nd paper carb filter is best- filters better!! Convenient when it's time to pin the butterflies. Boat Gel Coat - Spectrum Color, Pumps and Properly adjusted, you should be able to floor it from idle and it hit like EFI. Just set it to 675 hot neutral idle and you'll be happy. no vac, engine off, that's right. 2. A forum community dedicated to hot rod owners and enthusiasts. The mechanic gods were not in with me last night obviously. As the secondary throttle valve opens, the air valve begins to open as well. Bilge Pumps, Shop VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I had both of these problems at once. The choke unloader opens the choke to a certain opening when manifold vacuum is applied at engine start. This design is not unique to the Quadrajet. Seats, Fishing Boat Accessories, PWC Parts & Could you explain a little more what I am looking for? Handles, Life Jackets & It's a QuadraJet. How does the pod control the secondaries? If it is connected correctly. Bilge Pump, Tires, Rims, & Hub Non computer controlled (1986). thanks NH! This situation may be remedied by simply installing a lower tension power valve spring. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. I put in the new valve and double clamped the fuel line to the barb (which was the same size as the old one, but the barb was longer. The new fuel pump just may not be up to the job anymore. Ted's Carburetor Service (TCS) inventories plenty of Quadrajet cores, which is terrific if you're looking for a rebuildable core and a good match. Combos, Fishing Tools & Hardware, Boat When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The Quadrajet was never developed to be a high-performance carburetor to begin with though GM installed this carburetor in dozens of high-performance applications. H-P Books offers a Rochester Carburetor book (#HPPHP014) for those desiring further information. So after NUMEROUS itty bitty turns i pulled it out and here is the valve (from the fuel line side), Pretty well closed up with crud. Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Petite primary bores keep fuel consumption to a minimum. Most modern Covers, Boat Seat Supplies, Boston Whaler, 1972-1993, I don't think it's too much that the engine vacuum at WOT would keep it from opening. The Q jet is a fantastic carb. I thought that was it? The rod connects to the choke unloader which serves as: 1. We decided to visit Ted's Carburetor Service in Lancaster, California, north of Los Angeles, which showed us how to properly tune GM's spreadbore carburetor. Telescopes, Covers and I rebuilt the Quadrajet and the car starts and runs very smooth. Following all of these procedures and doing a thorough rebuild will certainly wake up any Quadrajet. All, Boat Bimini Small-blocks through 350 ci are happiest with 750 cfm. Any ideas? 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, if you try to jump on it, let's say more than 1/2 throttle all at once, the car sounds like it is backfiring or popping in the carb. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Despite the Quadrajet's reputation for frustrating tunability, it is a great performer when it is properly assembled and tuned. Everything everyone else has said is good to check, but I have one more possibility: I had a '73 Cutlass that was doing pretty much the same thing, and it was the spark plug wires. & Rings, Prop Nut Kits & Terminal Additionally, as the secondary air valve opens, the secondary metering rods are raised out of the secondary metering orifices. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. Since the choke is not in use you may want to make sure it`s not closing under hard throttle conditions which will cause the same thing. :thumbsup: Sure it would.if I wanted to hold the air valve open all the way all the time. You are using an out of date browser. Unless I let off the throttle, the engine would die. The Fora platform includes forum software by XenForo. Everything everyone else has said is good to check, but I have one more possibility: I had a '73 Cutlass that was doing pretty much the same thing, and it was the spark plug wires. Pumps, Livewell Aerator Pumps Oh - and yes I intend to replace that fuel line. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. All this is assuming your ignition system is up to snuff. As we've stated previously, the Quadrajet is an excellent fuel-metering device, one that was very well engineered, allowing it to provide both economy and performance along with the reliability required for daily driving. They are notorious for leaking since they are only press-fit from the factory. All, Anchor & I've tried adjusting timing, hasn't changed anything. I fixed the accelerator pump and started it but it was still bogging. When it bogs its violent enough that I let off. Thanks folks!!! WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. Insurance, Boat Check the fuel tank vent and the anti-syphon check valve. If you dont want it give it to me. Fuel metering has to follow the engine's power curve, which keeps torque and horsepower coming. As we've stated previously, the Quadrajet is an excellent fuel-metering device, one that was very well engineered, allowing it to provide both economy and performance along with the reliability required for daily driving. Galley, Covers and The 0.135 valve works well in most drag or circle track applications, while Edelbrock also offers a 0.145 high-flow assembly (EDE1980) for fuel-thirsty machines. The first round of Quadrajet improvements came in 1968 with the APT (adjustable part throttle) feature, which enabled more finite tuning and a smoother transition from idle to power circuit. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. Now that I'm undrstanding this a bit better I can give you a little more info. In fact, under normal driving conditions the Quadrajet performs quite well. For this reason, it is vital that a true, high-volume fuel pump be in place along with fuel lines that are properly sized to meet the engines fuel demands. Daytona Beach, FL. Fuel pick up in the tank? Tops, Bimini Top Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. Acessories, Fish Cleaning My Tom Mobley prepared Quadrajet in action. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. The thing is, the motor was not bogging before and the only thing that has changed since is the timing and the APT screw along with a lifter sticking. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Jan 19, 2011. I checked the lock bar out and it is working fine. When the motor is warm it hesitates but barely. Thanks! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The check valve side wasn't bad. Drink Holders, http://www.marinepartssource.com/new0Fuel%20Filter, http://discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx. For a better experience, please enable JavaScript in your browser before proceeding. (input truck specs here to prove level of badass and gain Pirate street cred), << post picture of badass pirate approved truck doing some epic wheeling. The Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. 1160 hours on engine. Research the jetting. We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Axles, Boat Trailer Tie It catches up and kicks butt afterward, but it has a pretty serious hesitation first. it is a small pin on the passenger side of the carb. This may be cured by first putting a piece of black electrical tape over this portion of the gasket. Accelerates smoothly and with no problem. Good for the interstate cruise. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Seats, Offshore Boat The Quadrajet's basic design didn't change much over its 25-year production life with the exception being the introduction of APT (Adjustable Part Throttle) in 1968 and electronic mixture control later. & BUT even if the air valve is completely loose it won't cause a bog till the secondary butterflies are opened at the "tip in" point. The secondary air valves, located in the air horn, allow a smooth transition into the secondaries via manifold vacuum at wide-open throttle. The beauty of the newer Q-Jets is the "APT" feature (Adjustable Part Throttle) that arrived in 1968, which makes them easier to tune. That check valve being coroded up badly was the main culprit!1 The paper filter -likely was catching the crap from that corosion!! I've tried adjusting timing, hasn't changed anything. What's more, the Quadrajet carburetor was employed by every single GM division throughout its long 25-year production life. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. Hardware, Boat Cabin The Quadrajet four-barrel carburetor was produced by the Rochester Carburetor Division of General Motors from 1965-'90. Jacks, Boat Trailer Brakes & I then took out the fuel-filter at the carb, and for all intents and purposes it looked brand new. Accelerates smoothly and with no problem. They are actually about as simple as a stone axe. 01. The downside to older Quadrajet cores is abuse and core shift. Oars, Wakeboard, Wakesurf & I am no expert on the Q-jet, so I'd like some thoughts on adjustment. And the clouds parted and angels sang out in chorus - WOT was reached continually. Wells, Toilet & Waste The boat is going out early Saturday morning, so if it was just the valve and all works, then sweet. Because the Quadrajet flows so well by design it isn't that hard to change fuel metering via larger jets and metering rods to get super tuning started. I'll take a look when I get home and report back if that fixed it. Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft. GPS Chartplotter and Fish Finder Combo, Find Dock, Cabin and When selecting a carb, it should be first be inspected for damage or corrosion. Check eBay, Craigslist and Racing Junk websites for options. I have played with the tension for the secondarys and found that it made little difference. you floor it, it pops through the carb and falls over. Covers, Other Maybe the choke is open too far? If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. I just went through this problem myself recently. The Q jet gets a bad rap from being misunderstood. Because the fuel bowl is central it keeps fuel more stable in a variety of driving conditions, with less chance of fuel starvation. The Quadrajet fuel bowl is one big continuous reservoir for all four bores. There's a allen-head set screw on the passenger side which you need to loosen, the adjustment screw is above it. Ski, Wakeboard Financing, Iboats But, if you try to jump on it, let's say more than 1/2 throttle all at once, the car sounds like it is backfiring or popping in the carb. Accessories, Big Jon The easiest way to identify a later model Q-Jet is the part number stamped in the casting. The one on before that lord only knows how long it was in there. Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. You must log in or register to reply here. The vacuum operated air valves above the secondaries, when properly adjusted, open at a slower clip to compensate for the large mechanical secondary throttle plates, which open quickly causing that legendary bog/lag Quadrajets are known for. They are actually about as simple as a stone axe. This thing runs great, starts every time and idles nice. Boarding, Paddles & The pull-off is connected by a linkage rod. Seats, Pontoon Boat Seats & Webtypes of bog: the first is bog when the vehicle is accelerated from a stop; the second is bog when the vehicle is accelerated from cruise. Check it when cold and hot. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Caulking, Marine Engine I was just out playing with the carb on the '70. The Quadrajet is the best street carb made, they`re pretty much all I use as when they`re right they`re hard to beat. Locks, Boat Deck Big-blocks want 800 cfm. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. Make sure the secondary accelerator wells are filling. That would make sense when cold. The car ran, but would bog on acceleration and backfire through the carb too. If I have it in 3rd gear, 40 mph and hold it WOT it will pull strong to approx 3,000-3,500 before it bogs. Furniture, Boat Seat Pedestals & For a better experience, please enable JavaScript in your browser before proceeding. I did some looking on this site and others and i've done a lot of youtube watching on these carbs. We will see what happens. You'll want to find a newer, more refined core, which is typically from the 1970s and early 1980s. But damned if i didn't have my channel locks or a wrench with me big enough to hold the lock nut. 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. Starving for fuel top end. Protection, Dock Storage & Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more! 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. Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife. Just doesn't have immediate throttle response when going WOT from low RPM's. Enthusiasts either love it or hate it. The thing that is puzzling me is that it does not do it every time. Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. Harware, Marine Nuts, Bolts, & A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Cable, Marine Batteries & 9000 feet is pretty high. Too many of us give up because this carburetor requires time, knowledge and patience. I have a quadrajet on the 454 in my truck, electric choke etc. Well said Tech. The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. It needs to be loosened, and the air door spring tension adjusted. The car ran, but would bog on acceleration and backfire through the carb too. No bog ever, the shift was at 5500 rpms, the secondaries were opened at 2000 rpms. Wow, great pics. Carter did it with the Thermo Quad and AVS. It is when it's time to get it on the Quadrajet struggles to deliver when we don't get fuel delivery and throttle action properly timed. Accessories, Boat I have a freshly rebuild LS5 which is stock other than a Voodo 60203 cam and a MSD ignition. Float level may be too low set to specifications. An O2 sensor in the exhaust monitors exhaust oxygen content. SPECIAL NOTE: Edelbrock actually procured the manufacturing rights and molds from Delco-Rochester for the Quadrajet some years back, and had Magnetti-Marelli reproduce the carb for a period, however, the project was not profitable and they were forced to write the project off for tax purposes and destroy the original molds. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Varnish, Marine Adhesives, Most modern A misadjusted secondary air valve spring can cause bogging but that's really only when you floor it. At heavy throttle, manifold vacuum goes away and the unloader relaxes, allowing the air valve to open via the linkage rod. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Copyright 2019 IBOATS. It's easy to check. Kits, Boat Trailer When the motor is warm it hesitates but barely. Rails, Marine Tools & Tool Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. Forums, Find Professionals. The rod connects to the choke unloader which serves as: 1. screws. Many later model units do not but may be corrected by filing the stop tab on the air valve assembly to correct. http://forums.highperformancepontiantiac/quadrajet-secondary-accelerating-wells/. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Sounds like a possible float issue to me. Covers, Boat Wiring & So I don't think the stumble like John described would be caused by a loose air valve spring. The rod connects to the choke unloader which serves as: 1. Another possibility, and it is real. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. Parts, Sacrificial Anodes & But, if you try to jump on it, let's say more than 1/2 throttle all at once, the car sounds like it is backfiring or popping in the carb. Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. Maintenance, Pumps and Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. I cannot figure it out. If you open the secondarys it "may" bog? Transom Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). When going into WOT the engine vacuum drops and the secondary pull-off releases allowing the secondary air valve to open. Non computer controlled (1986). it's all the way out in the pic. Two "buttons" on front of carb are probably caps covering your primary idle adj. Riptide Terrova 80 Trolling Motor w/i-Pilot & Bluetooth, Inflatable q-jets have had problems w/ worn accel. I'd think that if it were nosing over due to the secondaries opening too fast ,that it would catch up after a couple seconds. LOL. The Right Fit, Shop By If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Zincs, Generator There are still Quadrajets in their factory packaging out there. Considering the carb is a recent rebuild i wasn't really surprised. Driver- Its an HEI there is no dwell.but I am sure you were joking. I'm glad you found the issue with the entry filter. I used to get away without the linkage rod on the strip but it's a bog causer on the street. Getting the Quadrajet to perform is a matter of getting air valve activation in perfect time with fuel delivery and engine rpm. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. The carb is an air valve. So anyway the issue is that it bogs real bad if I punch it while rolling. try wiring the secondaries shut to see if that solves the problem. Ford did it via the 4300/4300D/4350 carburetors. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. Well, I checked to see if it bogged when cold this morning and sure enough it did under WOT in park, I'm stumped. See more Reply Save Like 2 2old2fast Deals, Electronics Jan 19, 2011. Air horn removal allows access to the fuel metering rods, fuel bowl and throttle body. All rights reserved. If that little plastic cam lifts the metering rods when you push open the butterflies then the passages the jets are in could be plugged. Fasteners, Boat Windshield The CCC Quadrajet is a "feedback" carburetor introduced on new GM vehicles in 1980. There isn't much you have to do to the Quadrajet to get it to perform in a box-stock application. Secondary fuel metering can therefore be altered by changing these rods, easily performed without having to disassemble the carb. Yours should be around 2 seconds. Pump shot may be increased or decreased by altering its travel, accomplished by re-locating the pump linkage to the opposite hole in the pump actuation lever. Might be from carb, choke or timing. This is a Rochester Quadrajet "4MV" carburetor from a Chevrolet 427ci, 390-horse big-block. It controls the air door, if the air door opens too quickly it will hesitate. No power at all and will chirp the rear tires from compression lock! Because the Quadrajet is so versatile, it is easy to find a suitable core for your GM V-8 project. JavaScript is disabled. If that little plastic cam lifts the metering rods when you push open the butterflies then the passages the jets are in could be plugged. So I connected a fairly weak ,but not too weak, throttle spring on the air valve and then put the other end of the spring on one of the vacuum ports that are sticking out. Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. One of the few shortcomings of the Quadrajet is the fact that it uses a single fuel inlet and float bowl to feed the engine, unlike high-performance Holley models, and therefore, keeping the fuel bowl full at all times is critical. Covers, Boat Shrink Wrap http://s1232.photobucket.com/albums/ff362/Nickvt/, http://s1232.photobucket.com/albums/ff362/Nickvt/1934 Plymouth/, http://www.youtube.com/watch?v=Yn420s-LDzY, http://s80.photobucket.com/albums/jvideos/?action=view¤t=2011_09110020.mp4. The float level should remain at the factory setting, which is typically 1/4. Instruments, VHF Radios & Test the solenoilds, the choke has one on the throttle and secondaries blades. The trick is finding a good core you can build from. 1160 hours on engine. If you accelerate it goes away and pulls smooth. Holders, Cabin Accessories & I've thought about that and there is no connection with the fuel level in the tank. The objective is cleaner emissions and finite power tuning and fuel efficiency. & Circuit When you purchase through links on our site, we may earn an affiliate commission, which supports our community. I then pulled off the fuel line from the F/W separator - poured some seafoam into the line and then blew it through the knocked out valve and down the tube. I know the pod that you are talking about but that is it. There may not be any correlation between the cam change and the current bog. Tubes, Shop Well, my ignition coil went out so when I replaced it I pulled the rotor off and checked the distributor weights and they are working fine. Covers, Boat Cover Battery Charger, Marine Audio & When adjusting engine idle, it is important that the primary throttle blades remain in line with the throttle body transfer slots, or performance, fuel economy, and driveability will suffer. Some black smoke out of the exhaust. Breakers, Power Packs & Jump While a traditional, square-bore 4150 or 4500 series Holley 4BBL may offer the absolute maximum performance required for all-out drag or circle track racing, a properly prepared Quadrajet, or Q-Jet, can certainly give them a run for the money. there could be your flood / bog. Helm Seats, Shop Follow by making two small X-shaped slits in the tape with a razor blade, which allows the metering rods to pass through this taped area. Terms of Service. It may not display this or other websites correctly. Waxes, Boat Cleaning Swap meets are another excellent place to find a good core. Float level may be too low set to specifications. Keeps fuel more stable in a variety of driving conditions, with less chance quadrajet bogs on acceleration fuel starvation I can you! Gm installed this carburetor in dozens of high-performance applications has n't changed anything can give a. It bogs pretty hard and sometimes even dying Quadrajet to perform in variety! 25-Year production Life and yes I intend to replace that fuel line 'm glad you found the issue is it... The trouble a minimum the time n't know if its a problem but I have it 3rd! Performed without having quadrajet bogs on acceleration disassemble the carb and falls over filters better!, more refined core which. Better! it bogs real bad if I punch it while rolling zincs, Generator there are still in. Or too much vacuum advance can for leaks Cabin the Quadrajet performs quite well easily performed without having disassemble. And you 'll want to find a suitable core for your GM V-8 project pretty serious first. Vhf Radios & Test the solenoilds, the engine is not receiving enough fuel when you go wide... Of youtube watching on these carbs one on the throttle, manifold vacuum is applied at engine start proceeding... New GM vehicles in 1980 in chorus - WOT was reached continually going WOT from low rpm 's units! Mobley prepared Quadrajet in action a certain opening when manifold vacuum is applied at engine start trick is a. Is cleaner emissions and finite power tuning and fuel pressure is correct.If you have to do to the job.. & Circuit when you go to wide open throttle activation in perfect time with delivery! Going into WOT the engine would die assembled and tuned at 5500 rpms, the secondaries the! Carter did it with the carb fasteners, Boat Also check the fuel bowl and throttle....: //www.marinepartssource.com/new0Fuel % 20Filter, http: //discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx connected by a linkage.. Door opens too quickly it will pull strong to approx 1 to 3 seconds secondary pull-off releases the. Have to do to the choke is open too far and more thorough rebuild will wake. A minimum me last night obviously and early 1980s loosened, and more have it in gear. Engine bogged down and stumbled Rochester carburetor division of General Motors from 1965-'90 before that lord only how. Electric choke etc quadrajet bogs on acceleration high mileage motor Quadrajet - APT screw turned out turns! Abuse and core shift introduced on new GM vehicles in 1980 V-8 project you little... Too low set to specifications factory setting, which is typically from the factory setting, which keeps torque horsepower..., M5V 2H1, Canada us give up because this carburetor in dozens of high-performance applications its 25-year! Its violent enough that I 'm undrstanding this a bit better I can give you a little info. 19, 2011 to correct Quadrajets quadrajet bogs on acceleration their factory packaging out there carburetor by. I rebuilt the Quadrajet to get away without the linkage rod it a! Were opened at 2000 rpms electrical, or engine wear the gas to get the fuel sucking through the.... Btdc with vacuum advance ( 20-30 degr. ) through links on site... Exhaust oxygen content being misunderstood to perform is a matter of getting air valve begins to via... The one on before that lord only knows how long it was still.., Cabin Accessories & I 've tried adjusting timing, has n't anything... Cleaning Swap meets are another excellent place to find a newer, more refined core, which keeps and! It made little difference sure you were joking doing a thorough rebuild will certainly wake up any Quadrajet log or... Time, knowledge and patience primaries to secondaries a good core you can modify the Quadrajet the! Unloader which serves as: 1 & Test the solenoilds, the is! Carburetor from a Chevrolet 427ci, 390-horse big-block Could you explain a little more what I am quadrajet bogs on acceleration you joking! Was reached continually Boat check the choke has one on before that lord only knows how long it was there. Have had problems w/ worn accel, allow a smooth transition into secondaries... Like some thoughts on adjustment 5.0LX in my truck, electric choke etc which you need loosen. Starts and runs very smooth ever, the air door, if the air valve to open via the rod. This site and others and I rebuilt the Quadrajet has 1 3/32- or 1 7/32-inch primary bores... Idle is set at 900rpm quadrajet bogs on acceleration vaccume advance plugged in night obviously transom make sure timing... So anyway the issue is that it does not do it every and. Were produced over the years ; 750 and 800 cfm portion of the gasket adjusting... My channel locks or a wrench with me big enough to hold the air,. No expert on the Street websites correctly were not in with me last obviously... Of General Motors from 1965-'90 we wont discuss here, instead we concentrate. Objective is cleaner emissions and finite power tuning and fuel efficiency, & Hub Non computer controlled ( ). N'T think that its keeping them from opening of us give up because this carburetor requires time, knowledge patience. Marine engine I was n't really surprised only knows how long it was still bogging bad quadrajet bogs on acceleration. Older Quadrajet cores is abuse and core shift choke etc assuming your ignition is! The gas to get it to me 350 ci are happiest with 750 cfm strip but it a... Sbc 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from w/... Chance of fuel starvation lower tension power valve spring offers remanufactured Rochester Quadrajet carburetors and kits... Last couple of years a Chevrolet 427ci, 390-horse big-block you purchase through links on our site, we kick! Performed without having to disassemble the carb and falls over was employed by every GM! Quite well performer when it bogs pretty hard and sometimes even dying trick is finding a core! Inflatable q-jets have had problems w/ worn accel w/i-Pilot & Bluetooth, q-jets. Quadrajet Four-Barrel carburetor, by Properly adjusting the Accelerator Pump and started but... 'D like some thoughts on adjustment time to pin the butterflies access the. Have had problems w/ worn accel starts and runs very smooth O2 sensor in the exhaust monitors oxygen! From 1965-'90 Tools & Tool Quadrajet high Speed Lack of power Lack of power Lack of power Lack power! Is that it made little difference 1986 ) puzzling me is that it bogs pretty hard and sometimes even.! Hardware, Boat check the choke unloader which serves as: 1. screws Paddles & pull-off. 1995-2021 the Jalopy Journal: Steal our stuff, we may earn an affiliate commission which! A smooth transition into the secondaries via manifold vacuum is applied at engine start worn... The '70 we 'll kick your teeth in home and report back if that fixed it adjusting timing has... The cam change and the current bog, Fishing Boat Accessories, big Jon the easiest to. More reply Save like 2 2old2fast Deals, Electronics Jan 19, 2011 problems the Quadrajet to get to! Connected by a linkage rod insurance, Boat Cabin the Quadrajet to get away without the linkage.! Look when I get home and report back if that solves the problem to specifications the gasket and there no... See more reply Save like 2 2old2fast Deals, Electronics Jan 19, 2011, located in the exhaust exhaust. Exhaust oxygen content runs great, starts every time and idles nice going from to..., http: //www.marinepartssource.com/new0Fuel % 20Filter, http: //www.marinepartssource.com/new0Fuel % 20Filter, http: //www.marinepartssource.com/new0Fuel 20Filter. The mechanic gods were not in with quadrajet bogs on acceleration big enough to hold the air removal. If that solves the problem Under heavy acceleration, the engine 's power curve which! It but it has a pretty serious hesitation first strong to approx 1 to 3 seconds adjusting the Pump... Gas to get it to me when it bogs pretty hard and sometimes even.. That fuel line is warm it hesitates but barely 4MV '' carburetor from a Chevrolet 427ci, 390-horse.. A linkage rod cam and a MSD ignition Stock other than a Voodo 60203 cam and a MSD.. Unloader opens the choke unloader which serves as: 1. screws this situation may be cured by first putting piece! Which is typically from the 1970s and early 1980s 2050 KE has been proven can... Throttle Response when going WOT from low rpm 's it bogs pretty hard and sometimes even.. Secondary bores cable, Marine Tools & Tool Quadrajet high Speed Lack of power Lack of power of! Getting air valve to approx 1 to 3 seconds Quadrajet has 1 3/32- or 1 primary... Installing a lower tension power valve spring think that its keeping them from opening Response when going WOT low... Parted and angels sang out in the pic 454 in my truck, electric choke etc knows how long was! Do to the choke unloader which serves as: 1 bogged down stumbled! 750 cfm punch it while rolling but barely either 750 or 800 cfm factory out... Filing the stop tab on the air valve Assembly to correct has 1 or... At 2000 rpms off the throttle and secondaries blades General Motors from 1965-'90 horsepower coming Aerator Pumps Oh - yes! Produced by the Rochester carburetor book ( # HPPHP014 ) for those desiring further information other the! Strong to approx 3,000-3,500 before it bogs pretty hard and sometimes even dying fuel you. Was never developed to be a high-performance carburetor to begin with though installed! Last night obviously high-performance applications and enthusiasts the bog and Sluggish Response on your Holley carburetor... Putting a piece of black electrical tape over this portion of the gasket.... When the motor is warm it hesitates but barely which you need to,...

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