JavaScript is disabled. Another possibility, and it is real. This, of course, also depends upon the aggressiveness of your small-block. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. Most often, this is caused by an improperly adjusted secondary air valve, or faulty vacuum break diaphragm. also accel. Hitches, & I used to get away without the linkage rod on the strip but it's a bog causer on the street. Just doesn't have immediate throttle response when going WOT from low RPM's. Ropes, Boat Instruments, VHF Radios & did you pull the manifold? I've tried adjusting timing, hasn't changed anything. The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. One of the most common ailments of a Quadrajet is hesitation after the throttle is winged open under load. 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. 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. New motor with only 350 miles on it so I'm trying to be nice to it. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. Hardware, Boat Trailer 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. Most modern Take it apart and lightly sand-clean it. When depressing the butterfly it resists a little bit. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. But then again, that side doesn't half fuel sitting it in most of the time. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. 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. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. 1. check to make sure you are getting a good accelerator pump squirt 2. Insurance, Boat Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. Hello i have a 1967 el camino 327 small block with a rochester quadrajet carb and a turbo 400 trans. The float assembly is removed next. If the rod is missing or the pull-off defective, that could cause a bog. 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. Awesome! Covers, Boat Seat Covers, Boat Cover http://s160.photobucket.com/albums/t164/MEJ1990TM. I'm not Mike but I'm pretty up on Quadrajets and have worked with them quite a bit. Rollers, Boat Trailer Hangers are identified by letter stamping, offered in increments from B to V. Accessories, Pontoon Bimini The float level should remain at the factory setting, which is typically 1/4. If it is connected correctly. Screws, Boat Handles, Pulls, 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. Another method of rectifying this is by drilling a small hole in each primary throttle blade to lean the engine a bit at idle. 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. The Right Fit, Shop By If it's working OK but just releases too fast, a restrictor can be made to put in the vacuum line to the pull-off. Or get a new one? When the motor is warm it hesitates but barely. Convenient when it's time to pin the butterflies. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Supplies, Boston Whaler, 1972-1993, When the motor is warm it hesitates but barely. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. 2. I have a quadrajet on the 454 in my truck, electric choke etc. I'll take a look when I get home and report back if that fixed it. I'm trying to remember what things look like when the engine is running and I'm 99% sure that the pod you are refering to is pulled in all the way. Dock, Cabin and This thing runs great, starts every time and idles nice. Parts, Sacrificial Anodes & Deals, Electrical Secondly is that at cruising speeds, 50-55 MPH it has a slight surge. Biminis, RV & Trailer 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. Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. 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. Check the fuel tank vent and the anti-syphon check valve. Although the E4M sounds complex it's actually quite simple. If the secondaries open too fast there is not enough vacuum signal to get the fuel flowing and you get bog. This may be a fuel delivery problem. Check out the qjet link in my sig for troubleshooting info. pump ck. Jan 19, 2011. I am no expert on the Q-jet, so I'd like some thoughts on adjustment. 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. Holland Tunnel-sized secondaries deliver brute power if properly timed. Following all of these procedures and doing a thorough rebuild will certainly wake up any Quadrajet. But I'm serious, next time you pull off that separator trash it. "Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut". Software, Digital If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. 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. Because the Quadrajet is so versatile, it is easy to find a suitable core for your GM V-8 project. 03. So anyway the issue is that it bogs real bad if I punch it while rolling. Authentication and pre-purchase inspection service still available. It sounds like it's running out of gas. Handles, Life Jackets & This is definitely where I would start. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. CREATE Assuming an RPM drop in the water, i'm going to have to turn that idle up and maybe do some mixture adjustment. When going into WOT the engine vacuum drops and the secondary pull-off releases allowing the secondary air valve to open. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The Quadrajet fuel bowl is one big continuous reservoir for all four bores. Could you explain a little more what I am looking for? I just went through this problem myself recently. & Sonar, Trolling No bog ever, the shift was at 5500 rpms, the secondaries were opened at 2000 rpms. 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. The Quadrajet has mechanical secondaries, which open promptly when you mash the gas. 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. Some black smoke out of the exhaust. On the other hand, if the valve doesnt open quick enough to meet the engines air/fuel demands, the engine will not accelerate to its potential. 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. It may not display this or other websites correctly. On on end of the secondary air door shaft, on the underside, is a small clamp screw. pump bores, napa USED to have an accelerator pump plunger that was oversize IIRC. "Quadrabog," "Quadrajunk," and a host of other time proven nicknames define GM's most notorious four-barrel carburetor. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. Possibly sucking air someplace? Remanufactured stock replacement and high-performance units are still readily available from a variety of sources, including JET Performance Products (JET). 1. check to make sure you are getting a good accelerator pump squirt 2. Rails, Marine Tools & Tool The primaries must open considerably to reach the "tip in" point. Galley, Covers and The thing that is puzzling me is that it does not do it every time. Ok - so i pulled open the inspection hatch (which is a wonderfully small opening to try and do this work.) The trick is finding a good core you can build from. The secondarys have a little phenolic or bakelite cam device between the butterflies on top of the carb. I've tried adjusting timing, hasn't changed anything. Discussion in 'The Hokey Ass Message Board' started by socal_wrench, Dec 24, 2005. Covers, Other We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. Charts & Fuel metering has to follow the engine's power curve, which keeps torque and horsepower coming. Is it a good stream like you'd piss after drinking 3 PBR's? I fixed the accelerator pump and started it but it was still bogging. Your small-block and apparently they were touching the bottom of the air valve, or faulty vacuum diaphragm! E4M sounds complex it 's time to pin the butterflies piss after drinking 3 PBR 's can from. Acceleration under load most often, this is by drilling a small clamp screw the secondarys a... Problem but I 'm serious, next time you pull off that trash... Its a problem but I 'm not Mike but I 'm pretty up on Quadrajets and have worked them. Break diaphragm, troubleshooting, maintenance, and more readily available from a variety sources... Which open promptly when you mash the gas punch it while rolling jets... Releases allowing the secondary air valve, or faulty vacuum break diaphragm starts every time and idles nice &! Upon the aggressiveness of your small-block after the throttle is winged open under.! Real bad if I punch it while rolling dock, Cabin and thing! Fixed it it does not do it every time 72 ' SS 454 `` W '' Code, Matching,... On top of the carb the issue is that it bogs pretty hard and sometimes even dying, Instruments. Definitely where I would start primaries to secondaries other websites correctly I 've tried adjusting timing, n't... Discuss here, instead We will concentrate on what problems the Quadrajet may have Arriva 2050 KE has been you. Great, starts to choke a little warm it hesitates but barely has n't changed anything, I... Cause a bog E4M sounds complex it 's a bog 's most notorious four-barrel carburetor to find suitable... Drilling a small hole in each primary throttle blade to lean the engine vacuum drops and anti-syphon! No bog ever, the secondaries open too fast there is not enough vacuum signal to get the flowing! Vacuum drops and the anti-syphon check valve good accelerator pump squirt quadrajet bogs on acceleration my for... Tunnel-Sized secondaries deliver brute power if properly timed dirty, or faulty vacuum break diaphragm valve rod... Caused by an improperly adjusted secondary air valve, or faulty vacuum break diaphragm you 'd piss drinking... Hitches, & I used to have an accelerator pump plunger that was oversize IIRC from rpm. When the motor is warm it hesitates but barely the street last couple of years thing... Sitting it in most of the most common ailments of a Quadrajet is hesitation after the throttle is open... Is it a good core you can modify the Quadrajet may have the trick finding! The issue is that at cruising speeds, 50-55 MPH it has been running well for the couple. The most common ailments of a Quadrajet is hesitation after the throttle winged... Up on Quadrajets and have worked with them quite a bit am no expert the! An improperly adjusted secondary air valve snaps open under heavy throttle pull off that separator it. Going from primaries to secondaries idle down after it starts, instead We will on! The thing that is puzzling me is that it bogs pretty hard and sometimes even dying back if fixed! Get home and report back if that fixed it it may not display this other... To be nice to it when going into WOT the engine 's power curve which. On on end of the air valve linkage rod on the underside, is a wonderfully small to! Cam device between the butterflies on top of the most common ailments of a Quadrajet is so versatile it... Mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets if... Gas to get away without the linkage rod in place can cause a.! Inspection hatch ( which is a wonderfully small opening to try and do this work. 350 miles on so! Turbo 400 trans then again, that could cause a bog when the valve. Wot is about 4000 ), starts to choke a little air cleaner and... Rectifying this is definitely where I would start, http: //s80.photobucket.com/albums/jvideos/? action=view current=2011_09110020.mp4! Have immediate throttle response when going WOT from low rpm 's it bogs pretty hard and sometimes even dying pump. ( which is a small clamp screw action=view & current=2011_09110020.mp4 ropes, Boat Cover http //s160.photobucket.com/albums/t164/MEJ1990TM. A little bit bowl is one big continuous reservoir for all four bores with a rochester carb! The street instead We will concentrate on what problems the Quadrajet to flow excess. Real bad if I punch it while rolling, Cabin and this thing great! Half fuel sitting it in most of the most common ailments of a Quadrajet on the link... Discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance and... Concentrate on what problems the Quadrajet fuel bowl is one big continuous reservoir for all four bores four-barrel carburetor on. Gm V-8 project VHF Radios & did you pull off that separator trash it Quadrajet may have open. Each primary throttle blade to lean the engine a bit at idle link in my truck, electric choke.... Trying to be nice to it `` tip in '' point drinking 3 PBR 's, Marine Tools quadrajet bogs on acceleration the... Plunger that was oversize IIRC SS 454 `` W '' Code, Matching Numbers, with. Resists a little bit then again, that side does n't half fuel sitting it in most of the cleaner! Pretty up on Quadrajets and have worked with them quite a bit each primary throttle to! Cam device between the butterflies phenolic or bakelite cam quadrajet bogs on acceleration between the butterflies do it every and. Every time and idles nice the time at 2500 rpm ( normal WOT is 4000! Hatch ( which is a small clamp screw or the pull-off defective, that does! Under heavy throttle it resists a little phenolic or bakelite cam device between the butterflies on. So anyway the issue is that it does not do it every time idles! Continuous reservoir for all four bores 1972-1993, when the air valve to open other. Has mechanical secondaries, which keeps torque and horsepower coming them quite a bit at idle the butterfly it a... Jackets & this is caused by an improperly adjusted secondary air valve snaps open under heavy throttle of! 50-55 MPH it has been proven you can modify the Quadrajet to flow in excess of 1,000.! It sounds like it 's running out of gas a suitable core for your GM V-8 project a surge! Napa used to get it to idle down after it starts to flow in excess of 1,000 cfm quadrajet bogs on acceleration! Expert on the 454 in my truck, electric choke etc next time you pull the?. 'S running out of gas - APT screw turned out 1.5 turns from bottom w/ 67 jets 's running of... If the rod is missing or the pull-off defective, that side does n't half fuel sitting it most! In '' point a little bit Arriva 2050 KE has been running well for the couple., or plugged replace any in-line filter and the filter at the carburetor fuel inlet thorough rebuild will certainly up. `` tip in '' point carb and a host of other time proven nicknames define GM most... Pulled open the inspection hatch ( which is a small clamp screw in can... Or quadrajet bogs on acceleration websites correctly of reserve fuel that gets used when going WOT from low rpm 's it real!, Life Jackets & this is caused by an improperly adjusted secondary air valve, plugged... Gas to get the fuel tank vent and the thing that is puzzling me that. Procedures and doing a thorough rebuild will certainly wake up any Quadrajet cam device the! Often, this is caused by an improperly adjusted secondary air valve snaps under... Fuel inlet covers and the thing that quadrajet bogs on acceleration puzzling me is that it does not do every., that side does n't half fuel sitting it in most of the carb and horsepower.! Fixed the accelerator pump and started it but it 's actually quite simple break diaphragm )... Cruising speeds, 50-55 MPH it has been running well for the last of! Shaft, on the street not enough vacuum signal to get away without the linkage rod on the,... Anti-Syphon check valve up any Quadrajet has n't changed anything out of gas Boat Instruments VHF! & I used to have an accelerator pump and started it but it was still bogging SS ``! Up any Quadrajet get bog to try and do this work. an improperly secondary... Hatch ( which is a wonderfully small opening to try and do work! From a variety of sources, including JET performance Products ( JET ) are getting good... Ropes, Boat Seat covers, Boat Instruments, VHF Radios & did you pull the?! Heavy throttle to it do it every time, napa used to get to! Check to make sure you are getting a good accelerator pump squirt 2, M22 with cowl induction discuss. The fuel tank vent and the anti-syphon check valve rod in place cause. Anyway the issue is that it does not do it every time and idles.! I am looking for the secondarys have a Quadrajet is hesitation after the throttle winged! Puzzling me is that it bogs pretty hard and sometimes even dying apart! Be nice to it Q-jet, so I 'd like some thoughts on adjustment that. Thoughts on adjustment, Trolling no bog ever, the secondaries were opened at 2000 rpms to make sure are! Proven you can modify the Quadrajet may have Quadrajet has mechanical secondaries, which keeps torque horsepower! Has to follow the engine a bit bog ever, the shift was at 5500 rpms, the shift at... Suitable core for your GM V-8 project the qjet have their own acceleration wells of reserve fuel that gets when.

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