MultipleVenturi Carburetion.

Principles of Gasoline And Disesel Fuel Systems
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(8) Choke Unloader. If for some reason the engine should flood when

it is cold, a device is needed to open the choke so that air may be admitted

to correct the condition. The device that accomplishes this is the choke

unloader. The choke unloader usually consists of a projection from the fast

idle can, which interacts with the throttle linkage. The operation is as

follows:

(a) As the throttle valve is fully opened, the projection on the

throttle lever contacts the projection on the fast idle can.

(b) The throttle lever, through the fast idle cam, then pulls the

choke valve open a measured amount.

f. MultipleVenturi Carburetion.

(1) General. A multipleventuri or multiplebarrel carburetor is

really a carburetor that has two or four separate singleventuri carburetors

arranged in a cluster which in most cases share a common choke, float, and

accelerator pumping system.

(2) Purpose. There are two reasons for using multipleventuri

carburetion:

(a) The use of two separate carburetors, each feeding separate

cylinders, can help to improve fuel distribution.