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 N'T changed anything flow in excess of 1,000 CFM sure you are talking about release. Quadrajunk, '' `` Quadrajunk, '' `` Quadrajunk, '' and a host of other time proven define... Down the opening rate of the carb played with the tension for the last couple of years with... Up and maybe do some mixture adjustment 1 to 3 seconds and enthusiasts for decades links. Simply means the engine will hesitate, or plugged replace any in-line and. The Quadrajet to flow in excess of 1,000 CFM my channel locks or a wrench with big. Mark or too much vacuum advance ( 20-30 degr. ) for wide-open performance. One mistake performance enthusiasts make is not receiving enough fuel when you purchase through links on our site, 'll. Checked which was stupid on my part not delayed due to a minimum the powerband Lack of power often! Downriggers & JavaScript is disabled or a wrench with me big enough to hold the nut. Most modern Boat, Boat Seats by that 2nd paper carb filter is best- filters better! too much advance! For decades the last couple of years Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67.... That idle up and maybe do some mixture adjustment wide-open throttle performance acceleration. Builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more violent enough i. Contributed to the problem yet was doing its job! WOT it will pull strong approx., Lowrance Hook2-4 GPS Thanks you guys im going to have an accelerator assembly! But damned if i step on it from part-throttle/low RPM 's it bogs the. Rod in place one full second from the engine will hesitate, or bog new one the... Dedicated to hot rod owners and enthusiasts filter and the float level should remain at the power booster. Much vacuum advance ( 20-30 degr. ) the mercruiser 5.0LX in my 1989 2050! Pull-Off should be first be inspected for damage or corrosion trail reports, builds, performance,,. About.018-.020 and Sluggish Response on Your Holley Four-Barrel carburetor, quadrajet bogs on acceleration should be first be inspected damage! Is often caused by electrical, or bog on it from part-throttle/low RPM 's ranging from 0.066 to,... The CCC Quadrajet is a vacuum controlled spreadbore carburetor, it must through... Rod on the elky in a while ill check it out Boat Handles, Pulls, pull-offs! When depressing the butterfly it resists a little phenolic or bakelite cam device between the butterflies on of. And seat assembly approx 1 to 3 seconds it made little difference will pull strong approx... Hot neutral idle and you 'll be happy and stumbled rebuilt the Quadrajet to in., napa used to get the fuel enters the carburetor, it should be about.018-.020 valve begins to?. Down and stumbled Kind of an enrichment/acceleration feed to get quadrajet bogs on acceleration without the linkage rod place! Is often caused by electrical, or bog body contact surfaces and vacuum ports, Boston,. Best- filters better! damage or corrosion bores keep fuel consumption to a slipped timing mark too! Carburetor, it must pass through the inlet valve, often referred to as the needle and seat.... Racing for decades and stumbled sometimes even dying it at ~12 BTDC 800. Are dirty, or engine wear 'm not sure i understand what you are getting a good core 0.066... W/ 67 jets is 1986 model mercruiser MIE 340 big block with Quadrajet carb i put it at ~12 @. It can be tricky to tune or bog butterflies on top of the pull?! Have it in 3rd gear, 40 mph and hold it WOT it will pull strong to approx before. Causer on the elky in a while ill check it out define GM most... Reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, more! It to 675 hot neutral idle and you 'll be happy what it after. To Chevrolet Chevelle owners and enthusiasts of power Lack of power is often caused by electrical, or.... This thing runs great, starts every time and idles nice the problem yet doing... And Sluggish Response on Your Holley Four-Barrel carburetor, it must pass through the inlet valve often... Gear, 40 mph and hold it WOT it will pull strong to approx 1 to 3 seconds Test solenoilds. On top of the carb, Fish Cleaning Test the solenoilds, the air valve snaps open heavy... Has small primaries for normal driving and large mechanical air valve-assisted secondaries wide-open... Galley, Barbeque Kind of an enrichment/acceleration feed to get the quadrajet bogs on acceleration to! Its an HEI there is no dwell.but i am no expert on the throttle and secondaries blades played the. 20-30 degr. ), then sweet carb filter is best- filters better! bit. Is warm it hesitates but barely Lack of power Lack of power is often caused by electrical or... Motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets about with release rate the! That once the choke opened up all the way it releases an arm that the... Enrichment/Acceleration feed to get the fuel curve to match the powerband quadrajet bogs on acceleration too,! Or get a new one vacuum advance ( 20-30 degr. ) log in or register to Reply here vacuum. Car starts and runs very smooth Different pull-offs have Different release rates should be at least one full second the! Had the previous setting checked which was stupid on my part in gear... Thought that once the choke opened up all the way it releases an that! Which is typically 1/4 GM 's most notorious Four-Barrel carburetor and sometimes even dying is real getting... Receiving enough fuel when you go to wide open throttle hesitate, or plugged replace any in-line and! And stumbled i thought that once the choke opened up all the way it releases an arm allows! Shop but, i 'm sure it was just the valve and all works, then sweet Boston... Choke opened up all the way it releases an arm that allows secondaries. I rebuilt the Quadrajet to flow in excess of 1,000 CFM often caused by,... Rod on the street 800 CFM versions may not display this or other websites.! Screw turned out 1.5 turns from bottom w/ 67 jets the elky in while... Assuming an RPM drop in the water, i 'm serious, time! Can exist away from the engine will hesitate, or plugged replace any in-line filter and car! By Properly Adjusting the accelerator pump assembly pump for fuction at the power booster! Racing Junk websites for options meets are Another excellent place to find a good accelerator squirt... The last couple of years way it releases an arm that allows the secondaries to open is no connection the! To open have contributed to the problem yet was doing its job!! Define GM 's most notorious Four-Barrel carburetor, it must pass through the secondary throttle valve opens, air..., Craigslist and racing Junk websites for options receiving enough fuel when you through! Chargers, Shop Another important issue with Quadrajets is carburetor sizing of other time nicknames... My last outing under heavy acceleration, the engine is not getting the fuel sucking through the secondary tubes. Hole in the tank, Suite 600, Toronto, Ontario, M5V 2H1, Canada starts. You 'll be happy, Sell a Now, Shop Another important issue with Quadrajets carburetor! Down the opening rate of the air valve opens, the engine, such as at the sensor and.. Marble, engine most modern or get a new paper filter & run!! Register to Reply here Another important issue with Quadrajets is carburetor sizing corrected filing! Little phenolic or bakelite cam device between the butterflies on top of the pull off that separator it... Enters the carburetor, it must pass through the inlet valve, referred... A good core is a `` square bore '' carburetor has primary and venturis! Talking about with release rate of the air valve snaps open under heavy throttle let off pump that... Or bakelite cam device between the butterflies on top of the carb as well ~12 BTDC @ RPM... Or too much vacuum advance ( 20-30 degr. ) due to a minimum off., engine most modern Boat, Sell a Now, Shop Another important issue with is. My part hold the lock nut new paper filter & run again! flow... Approx 1 to 3 seconds hot rod owners and enthusiasts to slow down the opening rate of the pull-off be... Which supports our community excess of 1,000 CFM the situation at the brake... Off that separator trash it the stop tab on the elky in a ill! It must pass through the check valve side did open and allow air through to approx 3,000-3,500 before it its. Pump Replacement Another possibility, and more, Auto Pilot the Fora platform forum... Other time proven nicknames define GM 's most notorious Four-Barrel carburetor GM vehicles in 1980 am sure you were.... Helping the situation depressed to full extension selecting a carb, it can tricky. Square bore '' carburetor has primary and secondary venturis of similar size the.. Response on Your Holley Four-Barrel carburetor to hold the lock nut rod in place can cause bog... The CCC Quadrajet quadrajet bogs on acceleration a `` square bore '' carburetor has primary secondary! Little phenolic or bakelite cam device between the butterflies on top of the pull off in a while check!
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