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Q-jet overhaul

Rochester Quadrajet parts description and overhaul discussion


 


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Why Quadrajet's are awesome part 1





How to rebuild a Rochestor Quadrajet part 1
Introduction and beginning the disassembly process





How to adjust Quadrajet secondary air doors
These take some trial and error to get them adjusted so that there is no bog, but it's not hard to do-here's how.





How to adjust carburetor mixture screws
Here's how to find and adjust the mixture screws on your carburetor. Note that metering-block style carbs such as Holley and Demon more often have one or 2 mixture screws in each metering block depending on the number of venturi. Also those may not be located at the bottom of the carb as in factory carburetors.





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)





How to measure and adjust Quadrajet float level
I have had several requests for this, so here you go: 1. The airhorn has to be removed to do this, but the carburetor does not have to be removed from the engine. 2. Some data says to measure from the toe(end that is opposite from the hinge), some say 5/16 inward from the end, etc. I suggest following the specs for your particular carburetor. 3. With the float in the raised position and the inlet needle lightly seated, measure from the top of the float to the top edge of the carburetor with NO gasket in place. If you have to adjust the float, bend at the area that has the cutouts, 4, If you are experiencing flooding issues then it is an excellent time to install a new needle/seat and float and that should cure flooding problems that are not choke-related.





How to rebuild a Rochester Quadrajet part 2
Continuing the disassembly process.





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!





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!





Rochester Quadrajet Marine Carburetor Rebuild Part 2 of 3
http://www.carburetor-parts.com is happy to provide this informational video about rebuilding the Quadrajet marine carburetor. You can buy marine kits here: http://www.carburetor-parts.com/SearchResults.asp?Search=marine+kit&Search. x=0&Search.y=0





Identifying Quadrajet vacuum ports
I always see a lot of questions about what various vacuum ports do on a Quadrajet. Here's a general guide that will point you in the right direction. Remember that there were many different Qjets over the years and vacuum port locations and number will vary. This video is representative of 1975-90 carbs. Enjoy!





Rochester Carburetor Trick!
If your Rochester Quadrajet or Dualjet Carburetor is Hesitating try this Trick!





Double Pumper Carburetor Video - Holley Install & Tuning DVD
Buy the "Holley Installation & Tuning" DVD http://store.boxwrench.net/Holley-Install-Tuning-DVD_p_12.html This is an animated tour of the Holley 4150 Mechanical Secondary "Double Pumper" carburetor. We'll guarantee you've never seen your carb in this way before. You can't learn the inside of your carb any better than how this DVD will show you. If you buy a brand new Holley 4-barrel, this DVD now comes in the box with every purchase. If you already own a Holley carburetor or would like to learn about the internals of the all-time, most popular modular style carburetor, this is the DVD for you. It's the ultimate installation, tuning and troubleshooting guide for the Holley modular style carburetor. This disc will also help tune and troubleshoot any other brand of modular style and some one-piece style carburetors. Menus are full of bonus information and detailed animated tours of carburetor internals and accessory kits. Get the full DVD with all of the interactive menus, detailed animated tours of internals and accessory kits here... http://store.boxwrench.net/Holley-Install-Tuning-DVD_p_12.html Don't forget our Basic Engine Building DVD. This video is great for people interested in car repair, car care, and restoration. As well as hot rods, muscle cars, performance parts, and Boosting horsepower. It can also help you to gain knowledge for increasing fuel economy, how to lower your emissions, and covers preventative maintenance to avoid little things like overheating. Sample clips on our YouTube page and at our store here... http://store.boxwrench.net/Basic-Engine-Building-DVD_p_8.html BoxWrench.net is a community and resource designed for automotive enthusiasts. New Transmission DVDs and a Differential Rebuilding DVD just added. BoxWrench Store: http://store.boxwrench.net/ BoxWrench on Facebook: http://www.facebook.com/boxwrench





Carburetor Installation how to Help Video - Holley Carb DVD
Buy the "Holley Installation & Tuning" DVD http://store.boxwrench.net/Holley-Install-Tuning-DVD_p_12.html Holley Installation & Tuning DVD: Quick Start Tuning Now that your new carb is installed, double check all the connections and fire it up. You need to check for fuel leaks immediately. If detected, shut the engine off and fix the problem. If you buy a brand new Holley 4-barrel, this DVD now comes in the box with every purchase. If you already own a Holley carburetor or would like to learn about the internals of the all-time, most popular modular style carburetor, this is the DVD for you. It's the ultimate installation, tuning and troubleshooting guide for the Holley modular style carburetor. This disc will also help tune and troubleshoot any other brand of modular style and some one-piece style carburetors. Menus are full of bonus information and detailed animated tours of carburetor internals and accessory kits. Get the full DVD with all of the interactive menus, detailed animated tours of internals and accessory kits here... http://store.boxwrench.net/Holley-Install-Tuning-DVD_p_12.html Don't forget our Basic Engine Building DVD. This video is great for people interested in car repair, car care, and restoration. As well as hot rods, muscle cars, performance parts, and Boosting horsepower. It can also help you to gain knowledge for increasing fuel economy, how to lower your emissions, and covers preventative maintenance to avoid little things like overheating. Sample clips on our YouTube page and at our store here... http://store.boxwrench.net/Basic-Engine-Building-DVD_p_8.html BoxWrench.net is a community and resource designed for automotive enthusiasts. New Transmission DVDs and a Differential Rebuilding DVD just added. BoxWrench Store: http://store.boxwrench.net/ BoxWrench on Facebook: http://www.facebook.com/boxwrench





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.





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