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Most choke valves in engines are butterfly valves mounted upstream of the carburetor jet to produce a higher partial vacuum, which increases the fuel draw. [ 1 ] In heavy industrial or fluid engineering contexts, including oil and gas production, a choke valve or choke is a particular design of valve with a solid cylinder placed inside another ...
The 'choke' mechanism on an SU carburettor usually also incorporates a system for holding the throttle plate slightly open to raise the engine's idling speed and prevent stalling at low speeds due to a rich mixture. The beauty of the SU lies in its simplicity and lack of multiple jets and ease of adjustment.
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.
As the airflow through the carburetor increases the reduced manifold vacuum pulls the power valve open, allowing more fuel into the main metering circuit. In a two-stroke engine , the carburetor power valve operates in the opposite manner: in most circumstances the valve allows extra fuel into the engine, then at a certain engine RPM it closes ...
Most Turbo-Air 6 engines use two one-barrel Rochester H carburetors; one per cylinder head. A later high performance engine uses four carburetors; one Rochester HV primary and one Rochester H secondary per head. The secondary carb had no choke plate, idle circuit, accelerator pump, power circuit, or vapor vent. [16]: 12
Cutaway view of the fuel system for the Ford Model T engine, showing the gravity-feed fuel supply, carburetor cutaway, and intake stream. [4] The Ford Model T engine had one carburetor, a side-draft, single-venturi unit. Its choke and throttle valves were controlled manually; the latter was with a hand lever rather than a foot pedal. The ...
Flooding can also occur if the choke has been over applied or has malfunctioned. A severe form of engine flooding occurs when excessive liquid fuel enters the combustion chamber. This reduces the dead volume of the combustion chamber and thus places a heavy load on the starter motor , such that it fails to turn the engine.
1930 Ford Model A woody panel van engine. An updraft carburetor feeds intake manifold on engine's right side. Linkages control throttle, mixture, and choke. Normally, the Model A engine was supplied with a Zenith one-barrel, up-draft, float-type carburetor, which was gravity-fed from a tank in the engine cowl (between firewall and dash).