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The company was established as Fabbrica Italiana Carburatori Weber in 1923 when Weber produced carburetors as part of a conversion kit for Fiats. Weber pioneered the use of two-stage twin-barrel carburetors, with two venturis of different sizes (the smaller one for low-speed/rpm running and the larger one optimised for high-speed/rpm use).
The Ford variable venturi carburetor was replaced by a Weber 28/30 TLDM which used a manifold vacuum-actuated secondary choke instead of the more usual sequential linkage which opens the secondary butterfly at 3/4 to full throttle. The 1.4 L version is less responsive to power modification than other CVH engines, and some common tuning parts ...
The intake manifold was a series of short tubular stubs cast as an integral part of the cylinder head. The heads for 175CD Zenith - Stromberg carburettor had two siamesed stubs (part of the head casting), making them not interchangeable with earlier heads using Dell'Orto DHLA40 or 40DCOE Weber carburetors , whose intake was four individual ...
The Series X modifications offered the same larger inlet and exhaust valves as the GP1, but also offered a new inlet manifold designed for three twin-choke 42 DCNF Weber carburetors fed by an electric fuel pump which boosted power up to 185 bhp (138 kW; 188 PS) and 195 lb⋅ft (264 N⋅m), however the standard camshaft was retained. [20] [21]
As the airflow through the carburetor increases the reduced manifold vacuum pulls the power valve open, allowing more fuel into the main metering circuit. In a two-stroke engine , the carburetor power valve operates in the opposite manner: in most circumstances the valve allows extra fuel into the engine, then at a certain engine RPM it closes ...
For the 1967 release of the Corsair 2000E the 2.0 L engine received larger ports, a new camshaft, and a 2-bbl Weber 32DIF carburettor on a new intake manifold in place of the earlier 1-bbl Zenith Stromberg. [8]: 44 These changes brought horsepower to 97 hp (72.3 kW) at 5000 rpm, up from 88 hp (65.6 kW). A revised clutch and flywheel were fitted ...
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Weber DFTH 30/34 - from 1987 until the end of production run (1989) Weber DFAV 32/36 - on engines exported to USA The engine produced 74 kW (99 hp) of power and 156 N⋅m (115 lb⋅ft) of torque, though a few models with a higher output were produced (for example an 81 kW (109 hp) version used in 1976 Ford Escort RS2000).
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