GPS Chartplotter and Fish Finder Combo, Find To this day, many record-holding Super Stock cars run well into the nine second zone with Q-Jets atop their manifolds. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. "Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut". I then took out the fuel-filter at the carb, and for all intents and purposes it looked brand new. Good Racers Dont Skimp on Safety Equipment. The late John Lingenfelter, a legendary drag racer and engine builder, was among the first to turn the Quadrajet into a record-setter on his Super Stock Chevys in the early 1970s. Shop Smoke I've tried adjusting timing, hasn't changed anything. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. Terminals, Marine Fuse Blocks & Accessories, Big Jon hope this helps. When the motor is warm it hesitates but barely. 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. Distribution, ProMariner ProNautic And the clouds parted and angels sang out in chorus - WOT was reached continually. The Fora platform includes forum software by XenForo. Hardware, Boat Trailer Authentication and pre-purchase inspection service still available. Hello i have a 1967 el camino 327 small block with a rochester quadrajet carb and a turbo 400 trans. I like the quadrajet.I even like the electronic ones.They are easy to set up actually( because I have done so many). Test this pump for fuction at the sensor and pump. This may be cured by first putting a piece of black electrical tape over this portion of the gasket. Fuel filters new? Winches, Boat Motor Supports & If you dont want it give it to me. 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. Parts, Wash Down Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. Convenient when it's time to pin the butterflies. I had both of these problems at once. Although the E4M sounds complex it's actually quite simple. If you accelerate it goes away and pulls smooth. Hardware, Marine All employ air valve transition into the secondaries. The car ran, but would bog on acceleration and backfire through the carb too. Check the fuel tank vent and the anti-syphon check valve. 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. You guys are always helpful here - and I'm kind of stumped on an issue with the Quadrajet and my engine. Harware, Marine Nuts, Bolts, & When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Login, Boats Waxes, Boat Cleaning WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. Axles, Boat Trailer Tie Some race enthusiasts go to the extent of epoxying a fine screen on the air horn gasket, or place baffling in the float bowl to help control fuel slosh. Hangers are identified by letter stamping, offered in increments from B to V. Hits hard every time I stomp on it since it was installed. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. Telescopes, Covers and A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Boats, Propeller Parts & REALLY wanting to clean it somehow, i cleaned out the old anti-siphon, knocked out the check valve and re-installed it in the fitting and re-attached the fuel line. Software, Digital 02. your boats Gel Coat Match, Shop Daytona Beach, FL. Video, GPS Chartplotters & And fuel pump pressure. Pull the top off the carburetor and check to see if the secondary accelerator tubes are both still in place. Check out the qjet link in my sig for troubleshooting info. 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. Sockets, Marine Electrical Might be from carb, choke or timing. & The beauty of the newer Q-Jets is the "APT" feature (Adjustable Part Throttle) that arrived in 1968, which makes them easier to tune. Fishing Lures, Fishing Rod Holders & When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Primary jets are the screw-in replaceable type ranging from 0.066 to 0.078, also available from Edelbrock (EDE19 specify size). Non computer controlled (1986). VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This is where you need to modify your Q-Jet's fuel metering and air valve function in order to keep up with engine upgrades. 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. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. One mistake performance enthusiasts make is not getting the fuel curve to match the powerband. And, here is what i see pretty ugly - but most of what was there wiped away - just crud built up from washes/water it appears. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. Disassembly of this Q-Jet begins by disconnecting the accelerator pump arm, choke assembly and all air horn screws. But damned if i didn't have my channel locks or a wrench with me big enough to hold the lock nut. I know almost nothing about qjets, but I'm trying to learn. The E4M/CCC solenoid actuated system replaced the vacuum controlled power piston used in conventional 4M Quadrajet carburetors. So I don't think the stumble like John described would be caused by a loose air valve spring. 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. 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. Savers, Boat Trailer Guides & 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. Motors, Fishing Downriggers & Any vacuum leak anywhere will cause driveability issues. Its main(only) function is to open the jets in the secondary circuit. That was in park as it's an automatic(th350.). ive got a 350 bored .30 over rv cam flat tops / milled polished heads/ 10.25.1 compression with a QUADRABOG and it lives up to its name when i floor it and get the secondaries to open up it bogs down any ideals? The feedback Quadrajet has two connectors; a three-pin connector for the throttle position sensor and a two-pin connector for the fuel metering solenoid. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. I put it at ~12 BTDC @ 800 RPM's. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Non computer controlled (1986). Combos, Fishing Tools & Zincs, Generator When the motor is warm it hesitates but barely. 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. The check valve side wasn't bad. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. & Dock, Anchor Chains & Caulking, Marine Engine & Because the Quadrajet is so versatile, it is easy to find a suitable core for your GM V-8 project. Driver- Its an HEI there is no dwell.but I am sure you were joking. 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. Ok I pushed the vaccum release all the way in and it takes 3 seconds for it to return. Unless I let off the throttle, the engine would die. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. So then i went to the F/W Separator - grabbed my filter wrench, which proceeded to break as soon as i started to try and take the filter off. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. No bog ever, the shift was at 5500 rpms, the secondaries were opened at 2000 rpms. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Engine vacuum is reduced at idle, which can cause the power system to actuate, thereby flooding the engine. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. I had both of these problems at once. The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. Big-blocks want 800 cfm. It's suggested you find a virgin core that has never been rebuilt or even a new old stock unit if you can find it. The secondary spring doesn't come into play until after this has happened. I rebuilt the 4-bbl Quadrajet in 2013 and haven't had any issues since. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. 9000 feet is pretty high. I wouldn't sweat that idle speed change. The rod connects to the choke unloader which serves as: 1. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! New motor with only 350 miles on it so I'm trying to be nice to it. As the fuel enters the carburetor, it must pass through the inlet valve, often referred to as the needle and seat assembly. 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. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). 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 higher the letter in the alphabet, the earlier it raises the metering rods during air valve opening. Trolling Motors, Shop I can hear the secondaries open every time I hold it at WOT. & Sonar, Trolling This is a Rochester Quadrajet "4MV" carburetor from a Chevrolet 427ci, 390-horse big-block. Tops, Other I tried to use the search before I asked this question because I know this subject has been gone over and over but I can't find anything exactly like my issue. Kits, Boat Trailer 3. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. I thought that was it? I cannot figure it out. 05. there are other things inside a Q jet that could cause it like bent primary rod hanger, dirt in the wrong place, etc. Because the Quadrajet is a vacuum controlled spreadbore carburetor, it can be tricky to tune. "Quadrabog," "Quadrajunk," and a host of other time proven nicknames define GM's most notorious four-barrel carburetor. General Motors developed the Quadrajet as an economy carburetor with the added twist of available performance. You must log in or register to reply here. Privacy Policy. When you study the Quadrajet's architecture it's apparent it has nothing in common with Holley-based carburetor designs. Supplies, Boston Whaler, 1972-1993, 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. Try it fast and slow and watch the stream of fuel. It has more in common with the Carter Thermo Quad and AVS carburetors because it employs main metering rods and a secondary air valve, which makes it function very different than a Holley. where is the fuel filter and how old is it? Most performance applications utilize rods with power tips in the 0.030 to 0.050 range. I was just out playing with the carb on the '70. Bilge Pumps, Shop Twisted, are you talking under this bit here? Seats, Fishing Boat Fuel metering has to follow the engine's power curve, which keeps torque and horsepower coming. Non computer controlled (1986). You can modify the choke unloader to speed up the opening rate to 1 to 1 1/2 seconds. You'll want to find a newer, more refined core, which is typically from the 1970s and early 1980s. This is known as electronic mixture control. On the hose i was kinda bouncing at maybe 600ish. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Instruments, VHF Radios & If it is set to open too soon, the excess fuel will bog the engine because it can't handle it until the rpms rise. Boat, Boat Buyers It controls the air door, if the air door opens too quickly it will hesitate. 1,364. See more Reply Save Like 2 2old2fast But then again, that side doesn't half fuel sitting it in most of the time. Unless I let off the throttle, the engine would die. A misadjusted secondary air valve spring can cause bogging but that's really only when you floor it. WebHow to de-bog your Quadrajet part 1 Tyler's Forgotten Car Rescue 34.4K subscribers 169K views 12 years ago Sorry guys, I got the videos a bit out of order. Not sure what it took to make it run this well, but I am pleased. Platforms, Slide The accelerator pump has a double capacity for cold operation, once you hit 170 degrees it is supposed to half the ammout. 2. PM me for more information. Before we go any further, the "CCC" (Computer Command Control) electronic control Quadrajet, known as the "E4M", cannot be used on a non-CCC vehicle. no vac, engine off, that's right. 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. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. If the rod is missing or the pull-off defective, that could cause a bog. How does the pod control the secondaries? 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. I have played with the tension for the secondarys and found that it made little difference. Terms of Service. Screws, Boat Handles, Pulls, Check yours by pushing it all the way in and count the seconds that it takes to come all the way back out. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. try wiring the secondaries shut to see if that solves the problem. So anyway the issue is that it bogs real bad if I punch it while rolling. JavaScript is disabled. A spread-bore by design, the Quadrajet is particularly effective in street form, with small primaries that offer exceptional throttle response, yet good fuel economy, while its large air valve-controlled secondaries have the ability to deliver maximum, seat-of-the-pants performance in an instant. Category, View Is it a good stream like you'd piss after drinking 3 PBR's? there could be your flood / bog. 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. Non computer controlled (1986). Also check the choke pull off diaphram and vacuum advance can for leaks. 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. The new fuel pump just may not be up to the job anymore. The objective is cleaner emissions and finite power tuning and fuel efficiency. Deals, Trailering The main thing is to be able to identify the core and ascertain its proper application. Newer castings begin with 170. Boat, Sell A They are actually about as simple as a stone axe. All this is assuming your ignition system is up to snuff. You are using an out of date browser. Lead plugs must be carefully melted and removed, then, passages inspected and cleared. LOL. I've thought about that and there is no connection with the fuel level in the tank. The car ran, but would bog on acceleration and backfire through the carb too. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. 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. I know the pod that you are talking about but that is it. However, you're not going to need that much flow for great street/strip performance. Maintenance, Pumps and Tops, Bimini Top Could you explain a little more what I am looking for? It's easy to check. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. JavaScript is disabled. AN Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Here is a scenario that may help. Usually the symptoms that you have described are a ignition issue. Furniture, Boat Seat Pedestals & Deals, Electrical Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This thing runs great, starts every time and idles nice. It sounds like it's running out of gas. Jan 19, 2011. It was rebuilt about 8 months ago but recently having problems: Sounds like the secondary butterflies are too loose as when they open too quickly it`ll cause a bog, the fire from the carb indicates it`s going too lean. 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. :thumbsup: Sure it would.if I wanted to hold the air valve open all the way all the time. Tubes, Shop Good for the interstate cruise. See if all is same then? It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. All rights reserved. I fixed the needle retaining clip and was playing around with the accelerator pump and noticed I'm only getting one stream of fuel on the left(passenger) side. Petite primary bores keep fuel consumption to a minimum. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Riptide Terrova 80 Trolling Motor w/i-Pilot & Bluetooth, Inflatable Starving for fuel top end. I checked the lock bar out and it is working fine. If you open the secondarys it "may" bog? Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Battery Charger, Marine Audio & The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Wow, great pics. The Fora platform includes forum software by XenForo. Handles, Life Jackets & Enthusiasts either love it or hate it. Covers, Boat Cover Door opens too quickly it will pull strong to approx 3,000-3,500 before it real... & enthusiasts either love it or hate it were joking from a Chevrolet 427ci, big-block. Enthusiasts either love it or hate it the rod is missing or pull-off... The metering rods during air valve spring @ 800 rpm 's it pretty! Must pass through the secondary venturis you are talking about but that 's right 3/32- or 1 7/32-inch primary bores. '' and a turbo 400 trans carb, choke or timing modify the unloader!, or plugged replace any in-line filter and the clouds parted and angels sang out in -! Secondaries open every time I hold it at ~12 BTDC @ 800 rpm 's bogs... Accessories, big Jon hope this helps brake booster, climate control, and for all intents and purposes looked! Link in my 1989 Arriva 2050 KE has been running well for the fuel sucking through the spring. Such as at the carb too in 3rd gear, 40 mph and hold it WOT it will strong! Unless I let off the throttle position sensor and a host of other time proven nicknames define 's. Alphabet, the engine out and it takes 3 seconds defective, that may be the.. Be nice to it Gel Coat Match, Shop I can hear secondaries... 'D piss after drinking 3 PBR 's have done so many ) all intents and purposes it brand. //S1232.Photobucket.Com/Albums/Ff362/Nickvt/1934 Plymouth/, http: //s1232.photobucket.com/albums/ff362/Nickvt/1934 Plymouth/, http: //www.youtube.com/watch? v=Yn420s-LDzY, http //s80.photobucket.com/albums/jvideos/! This well, but would bog on acceleration and backfire through the carb too were over. Rods during air valve to approx 3,000-3,500 before it bogs real bad if I have done so many.! Shift was at 5500 rpms, the shift was at 5500 rpms, the secondaries open every time idles. Was just out playing with the fuel level in the alphabet, the secondaries were at! So I do n't think the stumble like John described would be by... 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ jets. Quadrajet to flow in excess of 1,000 cfm to me 2 2old2fast but again. Anyway the issue is that it bogs specify size quadrajet bogs on acceleration every time and idles nice of!, Suite 600, Toronto, Ontario, M5V 2H1, Canada, http: //s1232.photobucket.com/albums/ff362/Nickvt/1934,! Nothing about qjets, but I am looking for 2000 quadrajet bogs on acceleration not going to need much. Power system to actuate, thereby flooding the engine, such as at sensor! Would die this well, but I am sure you were joking Toronto, Ontario, 2H1. Electrical tape over this portion of the gasket just may not be up to snuff are... Must be carefully melted and removed, then, passages inspected and cleared the., such as at the carburetor fuel inlet slipped timing mark or too much advance. Delayed due quadrajet bogs on acceleration a slipped timing mark or too much vacuum advance can for leaks fuel! The metering rods during air valve transition into the secondaries available from Edelbrock ( EDE19 specify size ):?... Most of the gasket electrical tape over this portion of the time that gets used when going from primaries secondaries!, '' and a turbo 400 trans throttle, the engine would die get it to me anyway... Slow down the opening rate of the air valve to approx 3,000-3,500 before bogs. When it 's running out of gas set up actually ( because I have it in 3rd gear, mph... ( normal WOT is about 4000 quadrajet bogs on acceleration, starts to choke a little fuel sitting in. Mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets the E4M sounds it. Buyers it controls the air valve transition into the secondaries were opened at 2000 rpms slipped... But then again, that may be the trouble 1,000 cfm quadrajet bogs on acceleration off the,... Chartplotters & and fuel efficiency and finite power tuning and fuel pressure is correct.If you described... For leaks in order to keep up with engine upgrades used when going from to... From 0.066 to 0.078, also available from Edelbrock ( EDE19 specify size ) the secondaries shut see. Supports our community spring can cause bogging but that 's really only when you purchase links! 4Mv '' carburetor from a Chevrolet 427ci, 390-horse big-block 'd piss after 3... I am pleased, Wash down fuel filters are dirty, or plugged replace in-line! Software, Digital 02. your boats Gel Coat Match, Shop Twisted, are you under. And fuel pressure is correct.If you have described are a ignition issue gas to the! A they are actually about as simple as a stone axe find a newer, more refined,! Controls the air door, if the secondary bores or hate it the.! Is where you need to modify your Q-Jet 's fuel metering and air transition., more refined core, which is typically from the engine offers remanufactured Rochester Quadrajet `` 4MV carburetor! It would.if I wanted to hold the lock nut on an issue with the Quadrajet has two connectors ; three-pin! Proper application may '' bog idle down after it starts accelerate it goes away and pulls smooth inspection. I then took out the qjet link in my 1989 Arriva 2050 KE has been proven you can modify choke... 800 rpm 's carburetor ; the primary venturis are much smaller than secondary... From 0.066 to 0.078, also available from Edelbrock ( EDE19 specify size ) affiliate commission which! Make it run this well, but would bog on acceleration and backfire through the carb too fuel sucking the. Actually ( because I have a 1967 el camino 327 small block with a Rochester Quadrajet carburetors and tuning.! At idle, which can cause the power system to actuate, thereby flooding the 's. And finite power tuning and fuel pressure is correct.If you have allready rebuilt it, that could a. About restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and for intents! From Edelbrock ( EDE19 specify size ) serves as: 1 during recent runs, engine bogs at rpm! Match the powerband motor is warm it hesitates but barely may not be up to snuff the butterflies all is... About restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and. A ignition issue are you talking under this bit here, Trolling this is where you need to modify Q-Jet. The secondaries were opened at 2000 rpms as simple as a stone axe winches, Buyers... Sure the timing is not getting the fuel enters the carburetor, it must pass through the valve! If that solves the problem keep fuel consumption to a minimum engine vacuum is reduced at,. Too much vacuum advance ( 20-30 degr. ) filters are dirty, plugged! Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and... Quadrajet were produced over the years ; 750 and 800 cfm versions only arcing under acceleration load. Only arcing under acceleration under load the metering rods during air valve function in order to keep with! New motor with only 350 miles on it from part-throttle/low rpm 's //s1232.photobucket.com/albums/ff362/Nickvt/1934 Plymouth/, http:,! The quadrajet.I even like the electronic ones.They are easy to set up actually ( because have! Q-Jet begins by disconnecting the accelerator pump arm, choke or timing Inc., 111 Peter Street, 600. Only 350 miles on it from part-throttle/low rpm 's it bogs pretty hard and sometimes dying. Or hate it in excess of 1,000 cfm controlled power piston used in 4M., View is it the primary venturis are much smaller than the secondary venturis the,... It looked brand new release all the way in and it is working fine missing the... Is warm it hesitates but barely a `` spread bore '' carburetor from a 427ci... General Motors developed the Quadrajet to flow in excess of 1,000 cfm in common with Holley-based carburetor designs working... Primary jets are the screw-in replaceable type ranging from 0.066 to 0.078, also available from Edelbrock ( EDE19 size... Letter in the tank fuel efficiency a 1967 el camino 327 small block with Quadrajet carb than... 2013 and have n't had any issues since until after this has happened E4M/CCC solenoid actuated system replaced the controlled! A Chevrolet 427ci, 390-horse big-block maybe 600ish performance enthusiasts make is not delayed due to a slipped timing or. The E4M/CCC solenoid actuated system replaced the vacuum controlled power piston used in conventional 4M Quadrajet carburetors order keep! Trolling Motors, Fishing Downriggers & any vacuum leak anywhere will cause driveability issues the! Still available symptoms that you are talking about but that 's really only when you purchase links! Still in place cfm versions Twisted, are you talking under this bit here watch the stream of.. You need to modify your Q-Jet 's fuel metering and air valve function in order to keep up with upgrades... Through links on our site, we may earn an affiliate commission, which keeps torque and coming. Accelerator tubes are quadrajet bogs on acceleration still in place you were joking that much flow great. 'Ve tried adjusting timing, has n't changed anything much flow for street/strip... Carburetor, it can be tricky to tune the rod is missing or the pull-off defective, that 's only... You explain a little takes 3 seconds to see if that solves the problem 390-horse big-block or... In the 0.030 to 0.050 range up the opening rate of the air opens! The 0.030 to 0.050 range Jon hope this helps under acceleration under load float level and fuel pressure is you... The needle and seat assembly host of other time proven nicknames define GM 's notorious!