Carburetor Tuning Basics Engine Starter
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On the Quadrajet, this vacuum brake has two functions: 1) opening the choke further when the engine starts, and 2) unloading the secondary air valve. The brake is also designed to prevent secondary opening on a cold engine. When the engine is warm and the throttle has opened far enough to drop manifold vacuum, the brake enables the air valve to open. A calibrated diaphragm orifice on the brake offsets engine lag by keeping the air valve from opening until steady fuel discharges from the secondary nozzles. View Related Article
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