| 摘要 |
Gasoline engine induction system for automobiles and the like provides less emission of undesirable exhaust products by having carburetor without an idle jet so that engine idles on a lean main jet with small enrichment arranged for idle as against off-idle operation. Enrichment can be provided as by having the closing of the throttle open an external vent in the carburetor bowl, or by having a supplemental fuel jet opening in throttle barrel alongside idle position of downstream tip of throttle blade. Automatic choke can also be operated by mixture taken from downstream of carburetor venturi, heated, and delivered to thermally responsive choke actuator. Above features can be incorporated in a single small primary carburetor that is combined with one or two large secondary carburetors used for high power operation. Supplemental heating can be provided for mixture delivered by primary carburetor.
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