quadrajet-cam
See 1976 Chevrolet pickup with Rochester quadrajet upgrade on SBC 350 V8. We removed the hood, mounted a camera looking down on the air horn, and took it for a spin, running wide open on an uphill grade. See how the secondary air valve responds to rpm drop at each upshift of the THM. Also included is a smoking burnout.
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!
Quadrajet Electronic Carburetor Rebuild - Teardown Part 2
http://www.carburetor-parts.com. Mike's Carburetor Parts has provided this video about rebuilding the Rochester Quadrajet E4MC, E4ME, electronic version. This video is part 2 of 2, tear down. A later video will feature the assembly of this carburetor. (c) www.carburetor-parts.com
More Quadrajet tuning, some things! Part two in this Saga Sept 13, 2010
With the camera sitting on the oil filler cap a few more things to show how a metering rod system works on a carburetor. The car has a slight stumble and surge at a light throttle cruise at about 55 to 60 MPH. By swapping out the .050 metering rods to .048 units, the stumble and driveability concerns are now gone. Going richer would mean worse fuel mileage one may think? No! Now that the mixture is right, LESS throttle opening is needed now, which means higher vacuum, and this way the metering rods will block off the correct amount of fuel, and in the proper timing and percentages, so the car runs much smoother. As stated many times, patience and reading up on, and understanding how these intricate carburetors work will help out very much! Enjoy!
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.
More Quadrajet tuning, some things! Part one in this saga on Sept 13, 2010
The car has a slight stumble and surge at a light throttle cruise at about 55 to 60 MPH. By swapping out the .050 metering rods to .048 units, the stumble and driveability concerns are now gone. Going richer would mean worse fuel mileage one may think? No! Now that the mixture is right, LESS throttle opening is needed now, which means higher vacuum, and this way the metering rods will block off the correct amount of fuel, and in the proper timing and percentages, so the car runs much smoother. As stated many times, patience and reading up on, and understanding how these intricate carburetors work will help out very much! Enjoy!
Rochester QuadraJet M4ML
Quadrajet that i tweaked on a HDT VH Commodore - fast acting secondaries.
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)
The Infamous Quadrajet Moan
Making a full-throttle pull on the chassis Dyno with our 1972 Pontiac Trans Am with 455 H.O. engine.
1977 El camino carb and REV!!!!
i rebuilt my quadrajet 4 barrel and it ran so well that i had to rev it for you comment me and tell me if u like it
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.
