Transcription of How to Tune a Q-Jet (basic)
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How to Tune a Q-Jet (basic)
How to Tune a Q-Jet (basic) by Lars Grimsrud SVE Automotive Restoration Musclecar, Collector & Exotic Auto Repair & Restoration Broomfield, CO Rev. New 10-4-01 This tech paper will discuss basic set-up and tuning of QuadraJet carbs for optimum street performance and drivability. The procedure outlined here differs from other I have seen, and is based on my years of experience doing this work in the quickest, least painful, most economical way. It is recognized that other people will have different methods of doing things, and may disagree with specific methods and procedures that I use. Overview The Rochester QuadraJet, in its various forms and configurations, has been used by various GM Divisions for various applications since the mid sixties. The last passenger car version of the carb appeared as an ECM-controlled carb in 1981.
a given main jet size which meters fuel throughout the rpm range, including cruise. At WOT, the power valve unseats, and opens a fixed orifice, dumping a fixed amount of fuel in addition to the main jet. Crude, but simple and effective. The Q-Jet meters fuel through the main jets.
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