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).
Graph comparing power output using a 114° camshaft with a 5.25 compression ratio across four different carburetter configurations.
| Identifier | ExFiles\Box 179b\2\ img118 | |
| Date | 4th October 1932 guessed | |
| RM{William Robotham - Chief Engineer} P53 COMPARISON OF POWER OUTPUT WITH 5.25 COMP. RATIO 114° CAMSHAFT (E.92448) (LONG TYPE SILENCER CUT OUT OPEN) (DOUBLE VALVE SPRINGS) (STANDARD ROCKERS) ① STANDARD P1 CARBURETTER AND INTAKE SILENCER ② SEMI-EXPANDING CARBURETTER AND INTAKE ③ 2 - DIA S.U. CARBURETTER, BALANCED BY 1/4 DIA HOLE ④ SINGLE 2 1/2 BORE S.U. CARBURETTER | ||