These hangers are coded A, B, C, etc., in 0.005" changes in height, with "A" being the highest and "Z" being the lowest. 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. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. Replacing down channel restrictions in Quadrajet. With age the Quadrajet earned a following of technicans who understood its design and recognized its potential. It will take some experimentation to determine Quadrajet M4ME Exploded View Secondary metering rod info . The idle screws on a Rochester Quadrajet carburetor fine tune the air-fuel ratio going into the engine during idle. Rochester Quadrajet secondary rod hangers allow you to tune your carburetors secondary metering by adjusting secondary rod height, altering secondary rod power tip … If a repair manual with adjustment specifications is available, begin with the applicable spec. These systems at times overlap in … Therefore, an "A" hanger will pull the rods out sooner and higher than a "Z". Fine tuning on your bracket car between rounds is even more of a drag. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. Quadrajet Kit Installation Instructions. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. After the adjustment it worked sooooo much better. Quadrajet Idle tube replacement E4MC AND E4ME Instructions and measurements. More adjustment of the secondary circuit can be made with the rod hanger. Secondary Adjustment on Some Quadrajets. In contrast, the secondary barrels are huge, providing a performance edge. Use a 3/32 allen wrench to loosen the lockdown screw and use the adjustment screw to loosen or tighten as necessary. QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. 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. The primary barrels of the carburettor are tiny compared to most four-barrel designs, but this is what gives the Quadrajet its gas milage edge. Re: Adjusting Rochester Quadrajet secondary--Update--I took the boat out this afternoon. 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. QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. These systems at times overlap in … 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. 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. Marine carb spec. 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