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This company produced some of the best detailed and efficient carburettors of its time, very sought after nowadays by antique car racers and collectors. A fine example of Carburettors Ltd. craftsmanship is the unique square shape carb that equips the model 166 Arnott VW Supercharger, officially the 1 ¼ in. size. I offer some views in detail of this particular carburettor, I have taken away the air cleaner in one of them to show you the square shape inside the carb venturi.
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The
glory days of VW superchargers were the fifties and sixties. Arnott, a
firm established in Willesden, NW London, U.K., who had been producing
vane superchargers for some twenty years exclusively for British cars,
offered a VW kit as early as 1955. In fact, the Arnotts were produced in
different sizes, intended for various car model applications. Hence, the
trials made with the smaller version (displacement 525 liters/1000 revs.)
installed in split bugs with 1095 cc 25 hp engines, revealed that it
didn’t pump enough to supercharge the engine correctly. This led to
the adoption of the bigger size model 166 (displacement 825 liters/1000
revs.) that could cope with the mission. So well that it even stayed on
the market being offered for the 1200, 1300 and 1500 VW engine along the
years that followed. As a curiosity, Arnott was giving in 1955 the
specifications of the models referring to the displacement … in liters
!
Arnott
Superchargers was the brand name for the kits that were produced by the
company called Carburettors Ltd. Arnott tried marketing his kit for VW
in the US, for which he joint ventured with Bill Corey and the Arnott VW
kit sold in the United States was called the Arnott-Corey. 
