From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance graph comparing an extra short duration camshaft (HS.968) with a standard 107° camshaft for slow running.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page274 | |
| Date | 9th May 1935 guessed | |
| CAMSHAFT HS.{Lord Ernest Hives - Chair}968 EXTRA SHORT DURATION FOR SLOW RUNNING COMPARED WITH STANDARD 107° SHAFT. LARGE PER: CARS: INDUCTION PIPE E.100958 WITH POCKET FILLED IN. SLEEVE FITTED IN INDUCTION PIPE TAPERING FROM 1.75" TO 1.500" DIA. LARGE VALVE TURBULENT HEAD. Axes Labels: B.H.P. R.P.M. B.M.E.P. LBS/SQ" Camshaft Timing Diagrams: Diagram 1: F.100863, 107°, IN, EX, .020, 8, 5, 42, 34 Diagram 2: HS.{Lord Ernest Hives - Chair}968, 108°, IN, EX, .020, 6, 8, 25, 38 Diagram 3: HS.{Lord Ernest Hives - Chair}968, IN, EX, .020, T.D.C, 30, 34, 32 | ||