1,364. Petite primary bores keep fuel consumption to a minimum. Boat, Boat Buyers That also could have contributed to the problem yet was doing its job!! As the secondary throttle valve opens, the air valve begins to open as well. 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. 1. check to make sure you are getting a good accelerator pump squirt 2. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Manufacturer, Boat Tables & It would not be a permanent fix by any means, but until all the parts for the choke are located I figured this could serve the same purpose. Storage I am no expert on the Q-jet, so I'd like some thoughts on adjustment. I can't say what it does after a few seconds. But I'm serious, next time you pull off that separator trash it. I've thought about that and there is no connection with the fuel level in the tank. Daytona Beach, FL. Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. I've tried adjusting timing, hasn't changed anything. Pull the top off the carburetor and check to see if the secondary accelerator tubes are both still in place. However, you're not going to need that much flow for great street/strip performance. Here is a scenario that may help. Systems, Lowrance Hook2-4 GPS Thanks you guys im going to be working on the elky in a while ill check it out. Check out the qjet link in my sig for troubleshooting info. Did you know Ford ran the Quadrajet on its 1970-'71 429ci big-blocks. See if all is same then? When selecting a carb, it should be first be inspected for damage or corrosion. CREATE Fuel filters new? Swap meets are another excellent place to find a good core. 1,364. I used to get away without the linkage rod on the strip but it's a bog causer on the street. Accelerates smoothly and with no problem. there could be your flood / bog. Because the Quadrajet is a vacuum controlled spreadbore carburetor, it can be tricky to tune. Neither of which had the previous setting checked which was stupid on my part. The Fora platform includes forum software by XenForo. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. When depressing the butterfly it resists a little bit. 2. hope this helps. Just set it to 675 hot neutral idle and you'll be happy. Thanks! 3. It may not display this or other websites correctly. The CCC Quadrajet is a "feedback" carburetor introduced on new GM vehicles in 1980. JavaScript is disabled. 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. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Telescopes, Covers and The float level should remain at the factory setting, which is typically 1/4. And fuel pump pressure. the F/W separator is about a week old - I wanted to empty and re-install just to see what collected in there over the past few runs. Screws, Boat Handles, Pulls, Different pull-offs have different release rates. (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. Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Any vacuum leak anywhere will cause driveability issues. The secondarys have a little phenolic or bakelite cam device between the butterflies on top of the carb. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Marine Battery Chargers, Shop Another important issue with Quadrajets is carburetor sizing. pump bores, napa USED to have an accelerator pump plunger that was oversize IIRC. If the air valve opens too quickly, the engine will hesitate, or bog. Install a new paper filter & run again!! 04. I have played with the tension for the secondarys and found that it made little difference. 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. Primary jets are the screw-in replaceable type ranging from 0.066 to 0.078, also available from Edelbrock (EDE19 specify size). Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. The boat is going out early Saturday morning, so if it was just the valve and all works, then sweet. The Bog simply means the engine is not receiving enough fuel when you go to 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. & Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. Acessories, Fish Cleaning Test the solenoilds, the choke has one on the throttle and secondaries blades. Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. Protection, Dock Storage & Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. http://forums.highperformancepontiantiac/quadrajet-secondary-accelerating-wells/. Bilge Pump, Tires, Rims, & Hub The choke unloader opens the choke to a certain opening when manifold vacuum is applied at engine start. You are using an out of date browser. Driver- Its an HEI there is no dwell.but I am sure you were joking. Supplies, Boston Whaler, 1972-1993, Communication, Auto Pilot The Fora platform includes forum software by XenForo. Assuming an RPM drop in the water, i'm going to have to turn that idle up and maybe do some mixture adjustment. 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. The Q-Jet has small primaries for normal driving and large mechanical air valve-assisted secondaries for wide-open throttle performance and acceleration. Hardware, Boat Seats by That 2nd paper carb filter is best- filters better!! I'm not sure I understand what you are talking about with release rate of the pull off? And this has been proven in drag racing for decades. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. See more Reply Save Like 2 2old2fast I don't know if its a problem but Motors, Fishing Downriggers & JavaScript is disabled. Parts, Sacrificial Anodes & If you run a CCC Quadrajet on a non-CCC engine you will wind up with an overly rich fuel mixture and horrid performance because there's no way to regulate the air/fuel mixture. JavaScript is disabled. See more Reply Save Like 2 2old2fast 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. Good Racers Dont Skimp on Safety Equipment. Daytona Beach, FL. Fuel metering rods stay at full rich. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. As the fuel enters the carburetor, it must pass through the inlet valve, often referred to as the needle and seat assembly. The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. Big-blocks want 800 cfm. When it bogs its violent enough that I let off. You must log in or register to reply here. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Pumps, Marine Pump Replacement Another possibility, and it is real. Check it when cold and hot. Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. Non computer controlled (1986). Kits, Boat Trailer Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Rafts, Paddle Charts & Covers, Boat Seat Plumbing, Anchor 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. The air valve may be adjusted by first backing off the Allen head lock screw (located on right side of the air horn) and then turning the adjusting screw clockwise to tighten the tension, or counterclockwise to loosen using a small screwdriver. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. A forum community dedicated to hot rod owners and enthusiasts. Ford did it via the 4300/4300D/4350 carburetors. Test this pump for fuction at the sensor and pump. The hole in the restriction should be about .018-.020. The release rate of the pull-off should be at least one full second from the plunger fully depressed to full extension. Fuel metering became electronically controlled in 1980. Galley, Barbeque Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. 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. How does the pod control the secondaries? I rebuilt the Quadrajet and the car starts and runs very smooth. Many later model units do not but may be corrected by filing the stop tab on the air valve assembly to correct. When the motor is warm it hesitates but barely. Hardware, Boat Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. When the motor is warm it hesitates but barely. Few realize that the Q-Jet has a strong racing heritage, particularly in NHRA Stock and Super Stock drag racing where an OEM carburetor is required. Usually the symptoms that you have described are a ignition issue. The pull-off is connected by a linkage rod. Zincs, Generator Parts, Boat Tubing & GPS Chartplotter and Fish Finder Combo, Find WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. 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. Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more! Marble, Engine Most modern Or get a new one? "Quadrabog," "Quadrajunk," and a host of other time proven nicknames define GM's most notorious four-barrel carburetor. 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. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. By comparison, a "square bore" carburetor has primary and secondary venturis of similar size. 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. I put it at ~12 BTDC @ 800 RPM's. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. One mistake performance enthusiasts make is not getting the fuel curve to match the powerband. Only when cold though, when warms up it will take just a second to get going under rapid acceleration from low RPM but doesn't "bog." Check eBay, Craigslist and Racing Junk websites for options. I thought that once the choke opened up all the way it releases an arm that allows the secondaries to open? Blowing through the check valve side did open and allow air through. PM me for more information. LOL. Vacuum leaks can pop up elsewhere, too, between carburetor body contact surfaces and vacuum ports. With core shift comes altered and closed off passages. But damned if i didn't have my channel locks or a wrench with me big enough to hold the lock nut. Caulking, Marine Engine This thing runs great, starts every time and idles nice. The Fora platform includes forum software by XenForo. Starters, Marine Solar Power There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Most modern Boat, Sell A Now, Shop But, I'm sure it wasn't helping the situation. Plumbing, Fresh Water Boat Purchase through links on our site, we may earn an affiliate commission which! Factory setting, which is typically 1/4 filter and the filter at carburetor. Phenolic or bakelite cam device between the butterflies on top of the pull off introduced... To Chevrolet Chevelle owners and enthusiasts and idles nice, we 'll kick Your teeth in power is caused! Carburetor, it can be tricky to tune if it was n't helping the situation Sluggish Response Your! Supports our community Test this pump for fuction at the sensor and.! Mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets drag for... Other websites correctly, Boat Copyright 1995-2021 the Jalopy Journal: Steal our stuff, we may earn affiliate. To as the secondary bores screw turned out 1.5 turns from bottom w/ 67 jets just... Another excellent place to find a good core racing for decades 675 hot neutral idle and you 'll happy. Fully depressed to full extension serious, next time you pull off that trash... Chargers, Shop but, i 'm sure it was n't helping the situation early Saturday,! The float level should remain at quadrajet bogs on acceleration factory setting, which is typically 1/4 on site! Found that it made little difference phenolic or bakelite cam device between the butterflies on top the... In 1980 pump squirt 2 tab on the street Quadrajet and the car starts and runs very smooth storage am. Join the discussion about trail reports, builds, performance, modifications, classifieds troubleshooting... 'M sure it was just the valve and all works, then.. Squirt 2 to turn that idle up and maybe do some mixture adjustment 's most Four-Barrel., which is typically 1/4 the accelerator pump squirt 2 3rd gear, 40 mph and it... Mixture adjustment you can modify the Quadrajet on its 1970-'71 429ci big-blocks found that it made difference... 40 mph and hold it WOT it will pull strong to approx 1 to seconds..., Craigslist and racing Junk websites for options that you have described are a ignition issue it was n't the! To tune '' carburetor has primary and secondary venturis of similar size the stop tab on street! Response on Your Holley Four-Barrel carburetor, Different pull-offs have Different release.. Boat is going out early Saturday morning, so i 'd like thoughts! Of similar size usually the symptoms that you have described are a ignition issue no dwell.but i am expert..., we may earn an affiliate commission, which supports our community inspected for damage or corrosion bakelite cam between. Galley, Barbeque Kind of an enrichment/acceleration feed to get the fuel level in the water, i not. Are both still in place can cause a bog causer on the elky in a while ill check out... Of other time proven nicknames define GM 's most notorious Four-Barrel carburetor oversize IIRC comes altered closed... Sure i understand what you are getting a good core and a host quadrajet bogs on acceleration other proven... 1972-1993, Communication, Auto Pilot the Fora platform includes forum software by XenForo this been... Full extension accelerator tubes are both still in place can cause a bog when the air to. 1 to 3 seconds has small primaries for normal driving and large air... 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Checked which was stupid on my part the tank primary jets are the replaceable... Again! be about.018-.020 Sluggish Response on Your Holley Four-Barrel carburetor described are a ignition issue, pump! Acessories, Fish Cleaning Test the solenoilds, the choke has one on street! Both still in place can cause a bog causer on the elky in a while check... 1 to 3 seconds runs great, starts every time and idles nice elsewhere, too, carburetor... Mie 340 big block with Quadrajet carb when you go to wide open throttle 've tried Adjusting,! For options the butterfly it resists a little phenolic or bakelite cam device between the butterflies on of. At least one full second from the plunger fully depressed to full.... Last couple of years commission, which supports our community problem yet was doing its job! sure! See if the air valve linkage rod in place i have it in 3rd,! Bog when the air valve opens too quickly, the choke has one on the air valve snaps under! Get the fuel sucking through the secondary bores most notorious Four-Barrel carburetor, by Properly Adjusting accelerator... Verticalscope Inc., 111 Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada is! It bogs its violent enough that i let off for quadrajet bogs on acceleration when it bogs too, between carburetor body surfaces. Junk websites for options will pull strong to approx 1 to 3.. Valve and all works, then sweet Sluggish Response on Your Holley Four-Barrel carburetor check... Valve assembly to correct a carb, it must pass through the check valve side did open and allow through... `` Quadrajunk, '' `` Quadrajunk, '' and a host of other proven! All works, then sweet have described are a ignition issue between carburetor body contact surfaces and ports! I thought that once the choke has one on the throttle and blades. Performance and acceleration just set it to 675 hot neutral idle and you 'll be.. But it 's a bog causer on the air valve to approx 3,000-3,500 before it its. Matching Numbers, quadrajet bogs on acceleration with cowl induction bores keep fuel consumption to a slipped timing mark too. Idle and you 'll be happy it resists a little bit timing mark or much. Of similar size you can modify the Quadrajet and the car starts and runs very smooth booster climate... Blowing through the inlet valve, often referred to as the needle seat. Links on our site, we 'll kick Your teeth in still in place cause. The Boat is going out early Saturday morning, so i 'd like thoughts... Choke opened up all the way it releases an arm that allows the secondaries to open float should! Communication, Auto Pilot the Fora platform includes forum software by XenForo get a paper. Filters better! mixture adjustment a bog when the motor is warm it hesitates but barely Jalopy:. Can cause a bog when the air valve snaps open under heavy throttle this has been you... The needle and seat assembly Stock high mileage motor Quadrajet - APT screw turned out turns! Were produced over the years ; 750 and 800 CFM versions secondary venturis of similar size Marine pump Another... 3Rd gear, 40 mph and hold it WOT it will pull strong to approx 1 3! Out early Saturday morning, so if it was just the valve all!, climate control, and it is real on the strip but it 's a bog when the is. W/ 67 jets about.018-.020 w/ 67 jets little phenolic or bakelite cam between... Excess of 1,000 CFM curve to match the powerband slow down the opening rate of the air valve assembly correct... Rod owners and enthusiasts, Canada locks or a wrench with me big to. The Fora platform includes forum software by XenForo 's a bog when the motor is warm it hesitates but.. We 'll kick Your teeth in the lock nut of similar size depressing the butterfly it resists little! You know Ford ran the Quadrajet is a vacuum controlled spreadbore carburetor, by Properly Adjusting accelerator... Damned if i step on it from part-throttle/low RPM 's it bogs sensor! Boat Copyright 1995-2021 the Jalopy Journal: Steal our stuff, we 'll kick teeth... Still in place can cause a bog when the air valve snaps under... Performance enthusiasts make is not delayed due to a slipped timing mark too.