W12 Engine - Napier Lion

Napier Lion

The Napier Lion was a broad arrow-style W12 engine produced by Napier at Acton, West London, from 1917 to the late 1930s. This mostly alloy engine had a capacity of 24 litres (1,465 cu in) and produced from 450 to 900 horsepower (336 to 671 kW; 456 to 912 PS). It was used in many racing cars by John Cobb and Malcolm Campbell, racing aircraft such as the Supermarine S.5 Schneider Cup winner, and speed boats such as Hubert Scott-Paine's Miss Britain III. This configuration had three separate four-cylinder banks, each at 60 degrees offset from one another, as opposed to the "double V" layout used by Volkswagen-Audi (VAG). Sunbeam tried the similar Kaffir, based on their Arab V8 engine.

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