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This image was published 1908 and 1909 A pair of SU carburettors from an MGB. The SU carburettor was a constant-depression carburettor made by a British manufacturer of that name or its licensees in various designs spanning most of the twentieth century. The S.U. Carburetter Company Limited also manufactured dual-choke updraft carburettors for ...
The Rolls-Royce Merlin engine originally came with a direct carburettor, prone to cut-out due to fuel flooding in negative G. Miss Shilling's orifice was a very simple technical device created to counter engine cut-outs experienced during negative G manoeuvres in early Spitfire and Hurricane fighter aeroplanes during the Battle of Britain.
All MGBs from 1963 to 1974 used twin 1.5-inch (38 mm) SU carburettors. US spec cars from 1975 used a single Stromberg 1.75-inch (44 mm) carburettor mounted on a combination intake–exhaust manifold. This greatly reduced power as well as created longevity problems as the (adjacent) catalytic converter tended to crack the intake–exhaust manifold.
A Bendix Stromberg two-barrel carburettor was used in place of SU carburettors. [11] This rare engine produced 200 hp (149 kW; 203 PS) and 280 lb⋅ft (380 N⋅m) and, although export (to the UK) versions were planned, the closure by British Leyland of their Australian operations in 1975 precluded the widespread application of this engine.
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 key design consideration. Older engines used updraft carburetors, where the air enters from below the carburetor and exits through the top.
As the float relies on gravity, the chamber must be mounted vertically. Some designs, such as the SU, may allow a separate float chamber body to be adjusted relative to the carburettor to compensate for this. Acceleration effects may also apply a forwards force on the float and so the float hinges often have to be mounted across the car to ...
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SU Carburettors, widely used on British Commonwealth and European-designed vehicles. Villiers, used on UK motorcycles and small engines. Walbro and Tillotson carburetors for small engines. Weber carburetor, Italian, now made in Spain, owned by Magneti Marelli. Wheeler–Schebler Carburetor Company. Zama Group, primarily an OEM provider.
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related to: su carburetters troubleshooting