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Stihl was founded in 1926 by Andreas Stihl, an innovator in early chainsaw production. Stihl says it is the world's best-selling brand of chainsaws and the only chainsaw manufacturer to make its own saw chains and guide bars. [4] Andreas Stihl AG is a privately held company owned by the descendants of Andreas Stihl.
A 'power valve', which is a spring-loaded valve in the carburetor that is held shut by engine vacuum, is often used to do so. As the airflow through the carburetor increases the reduced manifold vacuum pulls the power valve open, allowing more fuel into the main metering circuit.
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 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 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.