General Category > Quadrajet Carb Talk and Tips

Rear air door opening vs secondary nozzle discharge vaccum

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Cliff Ruggles:
Keep in mind here that as you open the air flaps further you will reach a point of no return.  This simply happens because you start to loose too much area under the flaps which starts to reduce "pull" from the fuel nozzles. 

I did all of this testing over 20 years ago when I wrote the Q-jet book and backed it up with dyno and drag strip testing to find the most idea open angle for the airflaps.

I also had the carbs flowed for CFM.  The later castings with the air doors at the maximum useable open point flowed 849cfm. 

Removing the outer booster rings increased flow to 897cfm........

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