Norton CS1

The Norton Camshaft Senior Model 1 (CS1) engine was designed by Walter Moore in 1927, based on the Norton ES2 pushrod engine and re-using many parts. The frame was a new full cradle design and with a close-ratio kickstart-less gearbox, 8-inch brakes, Amal TT carburettor, Lucas Racing magneto and a 3-gallon petrol tank. The CS1 was the standard for racing Nortons for the next 20 years. The magneto was moved to the rear of the engine and the bottom end was a traditional Norton design, but in the side of the crankcase was the oil pump housing and a pair of bevel gears to drive the long shaft which ran in a tube up the side of the engine to a second pair of gears driving the overhead camshaft. ==Racing success==

Alec Bennett riding the CS1 on its first race won the Isle of Man Senior TT in 1927 and Stanley Woods set the fastest lap at 70.99 mph before retiring. Unknown rider Tim Hunt won the Amateur TT in following year on a Norton CS1, setting a new TT record. He later used the same motorcycle to win the gold medal in the Scottish Six Days Trial. In 1928 a Junior version of the CS1 with a 348cc engine and designated the Norton CJ was entered for the Isle of Man TT. The bore and stroke of this engine was 71 x 88 mm and it looked promising but 1928 proved to be an unlucky year for Norton, as there were technical problems with Walter Moore's redesigned cambox and only one major race was won that year. 1929 also went badly with reliability problems and only one win in the Spanish GP of 1929. ==See also==