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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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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.
When the plane went nose-down to begin a dive the resulting negative g-force would flood the engine's SU carburettor, causing the engine to stall. German fighters used fuel injection engines which avoided this problem. So in action a German fighter could evade a pursuing RAF fighter by flying a negative g manoeuvre which the RAF plane could not ...
Between the end of the 1962 RAC Hillclimb Championship season, in which he finished seventh in a V8-powered Cooper, and the beginning of the 1963 season, Westbury built a new hillclimbing special called the Felday-Daimler powered by a 2.5-litre Daimler V8 with a 2 in (51 mm) SU carburettor and a Roots supercharger. Westbury won the 1963 RAC ...
Induction was by a twin throat down-draft carburettor, the compression ratio was 8.0:1 and the total weight was 155 kg (342 lb). [1] An LPG version, the R-LPG , was produced for the last two years. The R engine was the Toyota engine used in the 1958 Toyota Crown , the first model to be exported to the United States.
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).
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