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In SU and other (e.g. Zenith-Stromberg) variable jet carburetors, it was mainly controlled by varying the jet size. The orientation of the carburetor is a design consideration but does not significantly alter the working principles. Older engines used updraft carburetors, where the air enters from below the carburetor and exits through the top.
Jet noise may be reduced by adding features to the exit of the nozzle which increase the surface area of the cylindrical jet. Commercial turbojets and early by-pass engines typically split the jet into multiple lobes. Modern high by-pass turbofans have triangular serrations, called chevrons, which protrude slightly into the propelling jet.
Original design incorporating a leather bellows which was replaced by a piston. This image was published 1908 and 1909 A pair of SU carburettors from an MGB. The SU carburettor is a constant-depression carburettor that was made by a British manufacturer of that name or its licensees in various designs spanning most of the twentieth century.
The much smaller primaries act as a small two-barrel carburetor until the accelerator is pressed far enough to start to open the secondaries. The small primaries allow the primary throttle plates to be opened wider, and thus making the carburetor more efficient than a large two barrel, or square bore four-barrel. Drivability.
These were arranged so that each cylinder of the engine had its own carburetor barrel. These carburetors found use in Maserati and Alfa Romeo racing cars. Twin updraft Weber carburetors fed superchargers on the 1938 Alfa Romeo 8C competition vehicles. [2] Fiat assumed control of the company in 1952 following Weber's disappearance in 1945.
"Their first original carburetor, called the iron pot, appeared on the curved-dash Oldsmobile in 1904." [3] In April 1905 Holley Brothers Company was established with an address at 661-75 Beaubien St., Detroit, Michigan. [4] The brothers then concentrated on the manufacturing of carburetors and ignition systems. [5]