ROCHESTER CARBURETORS

Bulletin 9D-7 August, 1951

Bulletin 9D-7
August, 1951
Model "BB"
Page 3

ROCHESTER PRODUCTS, DIVISION OF GENERAL MOTORS, ROCHESTER, NEW YORK

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FIGURE 1. MODEL "BB" CARBURETOR

The new Rochester Model "BB" Carburetor incorporates a number of distinct features. Fore­most of these features is the concentric float bowl, which completely encompasses the main bore of the carburetor. This float bowl concentricity in conjunction with the centrally located main discharge nozzles, prevents fuel loss on road inclines. Regardless of the angle the car may assume, the fuel level is at all times below the nozzle spill point.
A second feature of the model "BB" carburetor is the design of the Main Well Assembly. This assembly contains the Main Metering Jets and the Power Valve. It is attached to the carburetor air horn and suspended in the float bowl. Due to this suspension of the main well in the fuel bowl, engine heat cannot be directly transmitted to the main passageways through the Main Metering Jets.
The model "BB" carburetor incorporates the conventional six systems of carburetion; Idle, Part Throttle, Power, Accelerator Pump, Float, and Choke. Each of the systems is basically simple and can readily be traced and understood.

PERFORMANCE FEATURES

The model "BB" Carburetor, by metering a continuous fuel flow to the engine, gives smoother performance at all speeds. The continuous fuel flow to the engine is accomplished by having the idle and main metering systems How through common passages. This eliminates the transfer point, or point at which the idle fuel changes flow direction, a condition common to carburetors with separate idle and main well systems. It is often advantageous to operate the engine with full power mixtures without advancing the accelerator to the full wide-open

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