Editing Carburetor (section)
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===Secondary circuit=== Under high-throttle conditions, some carburetors are equipped with a secondary circuit, which is essentially another set of throttle bores/venturis fed by a second set of jets (similar to the primary circuit) which allow even more air/fuel into the intake charge, or a power enrichment circuit (Holley uses a power valve, Carter/Edelbrock use step up springs, Rochester uses a power piston, for example) that senses engine vacuum to determine the need for additional air/fuel mixture. Some carbs use both a secondary side (4 barrel or staged 2 barrel) and a power enrichment circuit.
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