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Constant vacuum carburetors (also called variable choke carburetors), whereby the throttle cable is connected directly to the throttle cable plate. Pulling the cord caused raw gasoline to enter the carburetor, creating a large emission of hydrocarbons. [15]
The choke provision for the Quadrajet was initially in the form of an intake-mounted, heat sensitive spring, (divorced choke), often referred to as a heat riser. The spring connected to a rod that actuated the choke mechanism on the passenger's side of the carburetor, and relied on intake manifold's temperature.
The manual choke pull handle in a 1989 Hyundai Excel. The term "choke" is applied to the carburetor's enrichment device even when it works by a totally different method. Commonly, SU carburettors have "chokes" that work by lowering the fuel jet to a narrower part of the needle. Some others work by introducing an additional fuel route to the ...
The Reece-Fish is a variable choke, [citation needed] side- or downdraft design, with few moving parts to wear or adjust. To change from side-draft to downdraft, the installer simply rotates the float chamber to suit the carburetor orientation.
This self-adjusting nature makes the selection of the maximum venturi diameter (colloquially, but inaccurately, referred to as "choke size") much less critical than with a fixed-venturi carburettor. To prevent erratic and sudden movements of the piston, it is damped by light oil in a dashpot (under the white plastic cover in the picture), which ...
The basic carburetor size can be selected by the butterfly valves, for DCO/DCOE the sizes are 38/40/42/45/48/50/55, with 40/45/48/50/55 being more common and available today. Jet size is based on choke size, and choke size is just based on engine displacement, RPM and application.