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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.
A 4.6-litre Rover V8 engine with SU carbs, fitted to a Rover P6. In 1995, Land Rover enlarged the Rover V8 to 4,552 cc (4.6 L; 277.8 cu in). The bore remained the same size as the previous 4.0 at 94 mm (3.7 in), but the engine was stroked by 10.9 mm (0.43 in) giving 82 mm (3.23 in) in total.
It had a smaller but more modern XPAG engine as fitted to the Morris Ten Series M, but in a more highly tuned state and like the TA with twin SU carburettors. This 1250 cc straight-four unit featured a slightly less undersquare 66.6 mm (2.6 in) bore and 90 mm (3.5 in) stroke and had a maximum power output of 54 hp (40 kW) at 5200 rpm.
It was succeeded by the Motorcraft 2150 carburetor. Flow rate is determined by the diameter of the venturi, which was cast into the float chamber side as a number within a circle representing the venturi size in inches: 0.98 - 190 cfm, 1.01 - 240 cfm, 1.02 - 245 cfm, 1.08 - 287 cfm, 1.14 - 300 cfm, 1.21 - 351 cfm, 1.23 - 356 cfm, 1.33 - 424 cfm [2]
The single SU-carburetted engine displaced 1.5 L (1476 cc/90 in 3) and with its output of 40.5 bhp (30.2 kW) at 4200 rpm could propel the car to 72 mph (116 km/h). In order to reduce noise, the crankshaft helical gear that drove the camshaft was steel and the camshaft gear was of resin-bonded fibre construction, rather than a steel-to-steel ...
The basic carburetor size can be selected by the butterfly valves, for DCO/DCOE the sizes are 38/40/42/45/48/50/55, with 40/45/48/50/55 being more common and available today. Jet size is based on choke size, and choke size is just based on engine displacement, RPM and application.
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Autolite 4300A Carburetor. The Autolite 4300 was a four-barrel (four venturi) carburetor manufactured by Autolite in multiple variants from 1967 through 1974. Used by both Ford and AMC, it was produced as an emissions-compliant replacement for the previous Autolite 4100 model, and was superseded by the Motorcraft 4350.