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750 vs. 800cfm Rochester Quadrajets-how to tell them apart

There exists a ton of misinformation regarding the actual airflow capacity of the Rochester Quadrajet. Not many people know how many variations there are or how to tell them apart. Here is a simple video explaining how to identify each size based on casting design. I will cover the "cfm-limited" carbs in a separate video.


 


More Videos...


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





Identifying vacuum ports, late-style Quadrajet
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!





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,





Idle Mixture Adjustment on 4 Barrel and 2 Barrel Carburetors
Setting Idle Mixture and Idle Speed on Carburetors with Idle Mixture Screws to Pass the Smog or Emissions Test with a Tachometer





re-jet your Quadrajet (part 2)
rejetting a Quadrajet





for Tim - Rochester tips





Everything you wanted to know about automatic chokes but were afraid to ask
I've noticed many people drive vehicles with inoperative chokes. Even though chokes can be intimidating, repairing and adjusting them actually is very simple. So, stop pumping that accelerator and follow along as we look at how chokes work and how to repair them.





Rochester quadrajet carb with d/choke.
This is a Rochester quadrajet carb with a devolved choke. It is being tested on a running engine. This was filmed on an ipad2.





How to rebuild a Rochester Quadrajet part 3
Finishing up the disassembly.





Quadrajet Moan
Quadrajet opening its secondaries. Edelbrock RPM 1910





How to identify 4 barrel carburetors
Here's a guide to help identify the most common 4bbl carbs including Edelbrock, Quadrajet, Holley and Thermoquad. There are a few older or more obsolete carbs not shown including Rochester 4G, Autolite-Motorcraft 4100/4300/4350 and Carter WCFB that I'll detail in the future provided I can actually find one.





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





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!





Understanding computer-controlled Quadrajets part 1 of 3
Here are a series of videos that talk about the E2ME/E4ME computer-controlled Dualjets and Quadrajets found on 80's GM products.





Most relaxing sound for men - Old-School American V8 Corvette C3 1979 (Stingray)
Includes Cold engine idle, warm idle and a bit of revving to about 4500 RPM. I decided to create this video since my Vette now sounds quite loud thanks to the Cherrybomb glasspack Exhaust and removal of the catalyst. The Exhaust is basically stock. I think this is one of the most relaxing sounds for men who are into cars and machines :) Engine: 5.7 L (350 cid) V8 L-48 Transmission: Warner 4-Speed Manual My Corvette is generally in very good condition and it has already been restored once in USA some years before it arrived in our country. I got the car in a state where the exterior + drivetrain were fine, but the interior needed new carpet, some painting and several other components in order to look great. I'm now pretty much done with the interior. The engine used to have issues but those were mostly external (bad thermostat housing, bad spark plug wires etc.). By now the engine is a pleasure to drive, but the Rochester Quadrajet carburetor has hard time keeping the pre-selected idle speed and sometimes wants to hold it higher, then lower. It might be also some extra fuel leaking in from somewhere occasionally. There used to be some vacuum leaks but I've taken care of them. Perhaps I will replace the intake + carb with an Edelbrock setup for next driving season. The engine compression has been measured recently and the results were perfect for all cylinders. NB! We will soon try to film the Vette from another car when driving on a motorway. I'm hoping to get some good footage that way. For more information and work history on my Corvette, Suburban and ex-Jeep Grand Cherokee, please visit my blog at http://www.georgescarblog.com .




Which car is faster? Which Car is Faster?





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