Development
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, Amac 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.
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