Trends in chassis development were also attended, and as sketched, the new machine would retain the hydraulic-damped girder forks and rear swingarm suspension of their singles, plus large-diameter alloy brakes to manage the inevitable blistering speeds to come from such an engine, given Benelli’s expertise with tuning small engines, especially in cam design, intake porting, and carburation. As champions in the 250cc racing class, Benelli set about that year designing a new 250cc racer, with four cylinders, twin overhead camshafts, a supercharger, and watercooling. Moto Guzzi, Gilera, BMW, DKW, NSU, and even AJS and Velocette in England were racing or developing such engines by 1938. The future of racing was clearly headed towards extracting more power from multi-cylinder, supercharged engines. As the technological high points of 1920s motorcycle racing began to look – and perform – like the antiques they’d become by the 1930s, the fratelli (brothers) Benelli took stock of the obvious trends of Grand Prix racing.
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