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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 aero-engines such as the Rolls-Royce Merlin and Rolls-Royce Griffon .
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.
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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 key design consideration. Older engines used updraft carburetors, where the air enters from below the carburetor and exits through the top.
It is crammed with weasely opinions with almost no citations. "The beauty of the SU lies in its simplicity and lack of multiple jets and ease of adjustment" is a bad one, and so is referring to the venturi carburettor as "an inherently inaccurate device whose design must incorporate many complex fudges to obtain usable accuracy of fuelling."
Retrieved from "https://en.wikipedia.org/w/index.php?title=SU_carburetor&oldid=889796492"This page was last edited on 28 March 2019, at 00:37 (UTC). (UTC).
Float chamber (left) of an updraught carburettor, showing the float (4) and valve (5). A float chamber is a device for automatically regulating the supply of a liquid to a system. It is most typically found in the carburettor of an internal combustion engine , where it automatically meters the fuel supply to the engine.
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.