ROCHESTER CARBURETORS

Bulletin 9D-9 January 1952

ROCHESTER PRODUCTS, DIVISION OF GENERAL MOTORS, ROCHESTER, NEW YORK
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MODEL 4GC
ROCHESTER CARBURETOR
The Rochester Model 4GC Carburetor consists basi­cally of two dual carburetors. The two carburetors will be referred to as the Primary or Pump Side and the Secondary or Fuel Inlet Side. The Primary Side completely controls the metering to the engine throughout the idle and part throttle range. The fuel from the Pri­mary Side is supplemented by fuel from the Secondary Side throughout the power or wide open throttle range. This design incorporates many new and distinctive features, as well as retaining manv of the tested and
proven features basic to the design of previous model Rochester Carburetors.
The Model 4GC Carburetor still retains the six basic systems of carburetion idle, Part Throttle. Power, Accelerator Pump, Float, and Choke. The fol­lowing discussion will trace and describe the operation of each of these systems, The recommended disassembly and assembly procedure is also given, for adjust-ment instructions and specifications, refer 10 Instruc-tion Sheet for the particular car application concerned.

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