SU carburetteurs (named for Skinners Union, the company which produced them) were a brand of sidedraft carburetor widely used in British (Triumph, MG) and Swedish (Volvo, Saab 99) automobiles for much of the twentieth century. Originally designed by George Skinner in 1910, they remained in production through to the 1980s. Hitachi also built carburetors based on the SU design which were used on the Datsun 240Z and other Datsun Cars. While these look the same, they are different enough that needles (see below) are the only part that fits both. The carburetor (American spelling, a. ... 1934 Triumph Gloria Six 1937 Triumph Dolomite Roadster 1974 Triumph GT6 Coupé The Triumph Motor Company had its origins in 1885 when Siegfried Bettmann and Moritz Schulte started producing Triumph bicycles in Coventry, England. ... MG is a British marque that traditionally has produced sports cars from 1924 to 2005. ... 2002 Volvo S80 Volvo Cars, or Volvo Personvagnar, is an automobile maker that was founded in 1927 in the city of Gothenburg in Sweden. ... A 1971 Saab 99. ... Hitachi may refer to: Hitachi (train) trains in Melbourne, Australia. ... The S30 Nissan/Datsun 240Z (known in Japan as the Fairlady Z and later in other markets as the 260Z and 280Z) are sports cars from Nissan of the 1970s. ... Nissan (日産) is a Japanese automobile maker. ...

SU carburetors featured a variable venturi controlled by a piston. This piston has a tapered, conical metering rod (usually referred to as a "needle") that fits inside an orifice ("jet") which admits fuel into the airstream passing through the carburetor. Since the needle is tapered as it rises and falls, it opens and closes the opening in the jet, regulating the passage of fuel, so the movement of the piston controls the amount of fuel delivered. A fluid passing through smoothly varying constrictions is subject to changes in velocity and pressure, as described by Bernoullis principle. ... piston + connecting rod In general, a piston is a sliding plug that fits closely inside the bore of a cylinder. ... A cone is a basic geometrical shape: see cone (solid). ... Gasoline is a petroleum-derived liquid mixture consisting primarily of hydrocarbons, used as fuel in internal combustion engines. ...

The piston is moved up and down by the partial vacuum in the inlet manifold, depending on the position of the throttle plate, between the carburetor piston and the manifold. For other uses, see vacuum cleaner and Vacuum (musical group). ... Left side of a Ford Cologne V6 engine, clearly showing a (rusty) cast iron exhaust manifold - three exhaust ports into one pipe. ... The term throttle may refer to: A type of valve that controls air and fuel flow into an engine, such as a butterfly valve in a carburetor. ...