Drag Racing 1/4 Mile times 0-60 Dyno Fast Cars Muscle Cars

How to de-bog your Quadrajet part 1

Sorry guys, I got the videos a bit out of order. The Rochester Quadrajet has gotten a bad rap over the years, often called a Quadrabog or Quadrajunk. In fact, this is a great multipurpose carbureter once you understand how they work and what not to do to them. In this clip I introduce you to the Quadrajet and begin explaining the theory of operation of these units. Enjoy!


 


More Videos...


How to de-bog your Quadrajet part 2
The Rochester Quadrajet has gotten a bad rap over the years, but it's actually an excellent carburetor once you understand how they work. Often referred to as "Quadrabog" or "Quadrajunk", many of the issues these units suffer stem from neglect, or "modifications" that do more harm than good. Being a spreadbore, air-valve secondary design, the Quadrajet is capable of flowing 750 or 800 cfm of airflow, eliminating the need to buy different carburetors when your set-up changes. In addition, the small primaries make for great drivability and fuel economy. In this clip, I'll discuss theory of operation on the secondary side, since that's where most problems arise. So, leave your preconceived notions at the door and let's see what makes these carburetors tick.





re-jet your Quadrajet (part 1)
rejetting a quadrajet





How to diagnose a Quadrajet part 3
Let's take a look inside





Choke Adjustment on Rochester Carburetor
This video shows how to set the Automatic Choke on a Rochester Carburetor with a 350 (small block) chevy Engine,





how to minimize engine bog with a Quadrajet carb
this is to minimize engine bog when the pedal is to the metal. do not over tighten, very small spring...you want to try 1/4 turns or 1/2...q-jets are good if tuned properly. also when you are tightening screw it will have tension on it so keep the screwdriver firm. 1986 gmc sierra single straightpipe to cherrybomb. you will need a small flathead screwdriver and a 3/32 allen key. be sure not to tighten to much or else your vacuum secondary flaps wont open.





Quadrajet Electronic Carburetor Rebuild - Teardown Part 1
http://www.carburetor-parts.com. Mike's Carburetor Parts has provided this video about the Rochester Quadrajet, electronic version. Part 1 of the tear down video.





The Infamous Quadrajet Moan
Making a full-throttle pull on the chassis Dyno with our 1972 Pontiac Trans Am with 455 H.O. engine.





Carburetor tuning
first tutorial ever take it easy on me. i didnt have the luxury of a vacuum gauge around so i did a general way of tuning a carb by ear. If u want a more perfect tune i suggest you use a vacuum gauge and or take it to a professional.





Rochester Quadrajet, the results!
Two mishaps, the first shown here, the choke coil I got was wound backwards, it made the choke butterfly wind up TIGHTER as the engine warmed up. I swapped on the one from the old carburetor fast enough, the second mishap made me feel like a crud and what did I mess up later that evening. The car would not start leaving the Etobicoke -Queensway show. It was not getting gas. We got it running by priming the carburetor, and boy, was I ticked at myself. In the end it was not my fault it looks like. The new accelerator pump umbrella and rod was a very poor and frail design, the umbrella came detached and stayed at the bottom of the of the pump well, and was a distressed mess. The maker will get a note from me. The upshot? The old assembly went in, all is perfectly fine, the slight tip-in hesitation is gone now too. Stupid lack of pride it seems these days making parts for even simple things like an old carburetor.





Rochester Quadrajet
The last thing to be looked at on the wagon, but really, no old car project is ever done, things keep being played with and adjusted. This is a correct Rochester Quadrajet 4-barrel carburetor I got some time ago, and has been renewed with new seals. The bushings and other hard parts were in good repair, so with the new seals. T o note, I called out the first three serial numbers as being "701" when in fact it starts with "704" . When building up a Rochester, one has to understand they can't just throw parts into it, they may be unhappy with the results. They should also be ready to have to change a jet here, a metering rod there, a spring or two after the unit is on to get the car running perfectly. The Quadrajet is a sweet carburetor, once you understand it a bit. As I am doing. It is running well, but will need a bit more tuning in the way of a stiffer primary metering rod return spring. Other then that, the car has more bottom and top end power, mid range is the same, but the bonus is, fuel mileage has picked up, the leaky bowl of the old unit is gone!





New quadrajet set up
New air-gap manifold and custom/rebuilt q-jet. Sounds good but I still need to set the timing on the distributor and the carb is tuned already. Hope you like, nothing to fancy just a few revs and walk around...the Exhaust is true dual no x/h pipe and it has cherry bomb glasspacks(3 inch)





Rochester QuadraJet M4ML
Quadrajet that i tweaked on a HDT VH Commodore - fast acting secondaries.





How to rebuild a Rochester Quadrajet part 9





Replacing an HEI Coil & Quadrajet Comments (Not a "How-to")
The '77 Olds 350 suddenly developed a pretty nasty miss under load, which slowly worsened to a miss at idle too. If you got close to the distributor with the engine running, you could hear the coil arcing all over the place! The Delta is equipped with the usual GM HEI distributor.





'77 Chevy K20: Quadrajet Choke Pull Off and Fast Idle Cam Observations
1977 Chevy K20. 350 crate engine. Rochester Quadrajet 4MV carburetor with divorced choke. Truck suffers from unexplained hesitation and bogging when in forward gears. Tends to rev just fine after a few minutes of mixed idling and high revving. Checking choke operations as well as a possible sticky fast idle cam as part of the process of elimination. - Truck is allowed to idle/warm up until 2:25 mark, at which point the engine is revved to about 2,000 rpm, and can be heard bogging (a hissing sound can be heard). The fast idle cam is seen dropping. Fuel flow can be seen in the glass-cased fuel filter right before the carb as remaining steady. - The engine is revved again about three more time up until 3:00 minute mark. The engine revs slightly higher, but the hissing and bogging can still be heard. - Engine is revved again at the 3:35 mark, slightly past the 3,000 rpm mark. Hesitation and hissing still evident, but less so than before. - Engine revved at the 4:25 mark to about 4,000 rpm. No hesitation or hissing heard. - Transmission is slowly shift through every gear starting at 4:55 mark. Shifted back into Park at 5:05 mark. - Engine revved again at 5:10 and 5:17 marks to 4,000 rpm. No hesitation or hissing is heard. To read up on the discussion, please visit the following thread: http://www.hotrodders.com/forum/1977-chevy-k20-engine-suffers-hesitation-po wer-loss-when-drive-213757.html




Which car is faster? Which Car is Faster?





Similar 1/4 mile timeslips to browse:

1992 Caravan : 7.570 @ 173.470
P Schultz, Engine: GM, Tires: 17.5X33-16


1980 Ford LTD : 9.430 @ 148.000
chase orstad, Engine: 306, Turbos: bigthumper Tires: M/T cheaterslicks 13


2006 Bugatti Veron 16.4: 10.410 @ 139.100
NA, Turbos: Quad Turbo DOHC 64 Valve W-16


1989 Dodge Caravan : 11.760 @ 115.900
Terry Ryan, Engine: 2.5 Dodge, Turbos: Precision SC50 Ballbearing Tires: MT 26 x 8.5 slicks


1989 Dodge Caravan Mini Van: 12.651 @ 105.440
Paul Smith, Engine: 2.5 Liter 4 cyl T1, Turbos: Enforcer 2 Tires: 215 60 R 15


1990 Dodge Caravan : 13.250 @ 104.200
Bryan, Engine: 2.5 SOHC, Turbos: T3/T04E 50 trim Tires: M&H 24.5 x 8 x 15


1990 Dodge Caravan ES: 13.620 @ 102.830
Bryan, Engine: Sotck, Turbos: T3/T04E S50 trim Tires: M&H 24x8.5


1985 Ford LTD LX: 13.795 @ 100.420
Scott Chamberlain, Engine: '94 5.0 HO EFI, Tires: Nitto DRs


1989 Dodge Caravan ES: 13.968 @ 98.040
Chuck Green, Engine: 2.5 litre, Turbos: Garrett Turbo II Tires: BFG Drag Radials P 225/50r15


1992 Ford LTD : 15.166 @ 92.660
Barry van Laatum, Engine: 302 Windsor EFI, Tires: 205/65R15


1986 Ford LTD CROWN VICTORIA: 15.380 @ 94.600
GREG, Engine: 5.0 HO EFI, Tires: COOPER COBRA


2009 Dodge Caravan SXT: 16.090 @ 85.240
Pete LaChapelle,


2007 Dodge Caravan SXT: 16.310 @ 85.020
NA,


2006 Jeep Liberty CRD Turbo Diesel: 16.460 @ 80.800
Wally Darbyshire, Engine: 2.8L Intercooled Trubo Diesel, Turbos: Garett


1977 Ford LTD II: 16.678 @ 80.900
Dustin, Engine: 351W V8, Supercharger: None Turbos: None


1985 Ford LTD LX: 16.740 @ 80.880
Jamie Turner, Engine: 5.0 EFI H.O.(LOL)-(143k miles), Tires: 215/55r16 Michelin


2004 Jeep Liberty Limited: 16.890 @ 80.580
NA,


2008 Jeep Liberty Limited 4x4: 17.010 @ 81.030
NA, Engine: sohc 12 valve v6,


2003 Jeep Liberty : 20.570 @ 76.900
lee lipton,


 


©2014 DragTimes - Disclaimer