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Forced induction in motorcycles is the application of forced induction (turbochargers or superchargers) to a motorcycle engine. Special automotive engineering and human factor considerations exist for the application of forced induction with motorcycles compared to other forms of motorized transportation.
A special 750 cc model which had Routt 750cc cylinder kits installed in America by Triumph to permit them to be used in American Motorcycle Association production-based racing events. The kits were installed on new T120R models while still crated. To qualify, motorcycles had to be made and sold to the public in the same form as they would be raced.
Later, in 1966, road bikes were produced as well. The first street legal bike used a Triumph Bonneville engine. Rickman initially supplied frame kits to the public, as no major British motorcycle manufacturers would sell engines separately. The frame kits were built for many engines, including Triumph twins, BSA singles and Matchless. [1]
The original Triumph Bonneville was a 650 cc parallel-twin motorcycle manufactured by Triumph Engineering and later by Norton Villiers Triumph between 1959 and 1974. It was based on the company's Triumph Tiger T110 and was fitted with the Tiger's optional twin 1 3/16 in Amal monobloc carburettors as standard, along with that model's high-performance inlet camshaft.
Although each Cheney motorcycle is different, many are based on the BSA C15 250 cc engine or the larger 500 cc unit version. The company also manufacture black powder-coated frame kits for BSA C15, B25, B40, B44 and B50 engines, as well as nickel-plated frame kits for Triumph 500 cc or 350 cc unit engines.
The crank was a fully machined single forging with increased big end diameter making it much stiffer and better-balanced and producing one of the smoothest running motorcycles in the Triumph range. [1] The head had smaller valves set at a steeper angle (30°). Recesses in the pistons allowed a 10:1 compression ratio.