In contrast, the secondary barrels are huge, providing a performance edge. AIRDOOR TENSION ADJUSTMENTS – (QUADRAJET) If you encounter a bog or hesitation when the secondaries open, more than likely the secondary air doors need to be adjusted. Replacing down channel restrictions in Quadrajet. The idle screws on a Rochester Quadrajet carburetor fine tune the air-fuel ratio going into the engine during idle. Re: Adjusting Rochester Quadrajet secondary--Update--I took the boat out this afternoon. More adjustment of the secondary circuit can be made with the rod hanger. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. Adjusting secondary air-valve spring tension on a Quadrajet using a small screwdriver and inverted Allen wrench is no piece ot cake, especially in tight engine compartments. Quadrajet M4ME Exploded View Secondary metering rod info . Therefore, an "A" hanger will pull the rods out sooner and higher than a "Z". With age the Quadrajet earned a following of technicans who understood its design and recognized its potential. Use a 3/32 allen wrench to loosen the lockdown screw and use the adjustment screw to loosen or tighten as necessary. This info may be of use to any of you who have a Rochester Quadrajet 4-BBL carburetor and would like to learn more about it - and specifically, how to tune it for optimum performance: Rochester's Quadrajet carburettors were a staple of General Motors V-8 powered vehicles from the late 1960s until the switch to electronic fuel injection was finished in the late 1980s. Secondary air valve adjustment is critical to Quadrajet performance because correct secondary air/fuel metering requires a constant depression or vacuum in the secondary venturis. This type does not use a secondary lockout as shown above.To adjust the type of Quadrajet secondary illustrated in the photo.Open the throttle until the rod touches the lever at A.Measure the gap between the rod and lever at B.Adjust … Rochester Quadrajet secondary rod hangers allow you to tune your carburetors secondary metering by adjusting secondary rod height, altering secondary rod power tip … Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. The most common cause of rough idle quality in engines equipped with this carburetor is an unevenly adjusted idle mixture circuit caused by incorrectly adjusted mixture screws. Quadrajet Adjustments. E4MC AND E4ME Instructions and measurements. Marine carb spec. These systems at times overlap in … 4MC 4MV Instructions & Measurements M4MC (75 later) Instructions & Measurements. If a repair manual with adjustment specifications is available, begin with the applicable spec. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. Fine tuning on your bracket car between rounds is even more of a drag. These hangers are coded A, B, C, etc., in 0.005" changes in height, with "A" being the highest and "Z" being the lowest. QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. It will take some experimentation to determine Quadrajet Idle tube replacement QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. Secondary Adjustment on Some Quadrajets. 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