PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 1/TASK 2
FAST IDLE CAM OPERATION.
(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
(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. Multiple-Venturi Carburetion.
A multiple-venturi or multiple-barrel carburetor is
really a carburetor that has two or four separate single-venturi carburetors
arranged in a cluster which in most cases share a common choke, float, and
accelerator pumping system.
(a) The use of two separate carburetors, each feeding separate
cylinders, can help to improve fuel distribution.