When set properly, the engine idles very smoothly. The brass knurled idle mixture screw, when turned in or out will either increase or decrease the amount of idle fuel supplied to that port. When an engine is at idle, the primary idle mixture fuel requirement is located and provided in a port in the venturi passage about ½” above the throttle plate when the engine has it’s highest internal vacuum. HOW DID THEY DO THAT? By applying some very innovative engineering techniques. (The power enrichment circuit is used primarily in larger displacement engines so we will not discuss that circuit in this bulletin.) They eliminate the need for the accelerator pump and power enrichment circuits. The Stromberg uses only three of these circuits. The simple in design little Stromberg NA-S3 carburetor is difficult to make operate properly because it is so poorly understood.įirst: How many circuits exist in a “normal carburetor - 5. The Proper Method of Setting the “Idle Mixture Control Screw” in a NA-S3 Stromberg Carburetor
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