Mixture Pre-Treatment for Clean Exhaust - The Zenith “Duplex” Carburation System

A carburetor adapted to exploit the control of exhaust emissions through consistency of metering and mixture quality, particularly in conjunction with a dual bore inlet manifold, is discussed against the background problems faced by the European motor industry.

The development and incidental research data which determined the design are followed by a description of production and quality assurance techniques, with special reference to the evolution of automatic flow testing apparatus.