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 with a 5.25 compression ratio under different carburettor and intake configurations.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page232 | |
| Date | 16th November 1932 guessed | |
| COMPARISON OF POWER OUTPUT WITH 5.25 COMP. RATIO RM.{William Robotham - Chief Engineer} P53 114° CAMSHAFT (E.82448) (LONG TYPE SILENCER CUT OUT OPEN) (DOUBLE VALVE SPRINGS) (STANDARD ROCKERS) ① STANDARD PI CARBURETTER AND INTAKE SILENCER ② SEMI-EXPANDING CARBURETTER AND INTAKE ③ 2 - DIA SU CARBURETTER, BALANCED BY 1/4 DIA. HOLE ④ SINGLE 2 1/2 BORE S.U. CARBURETTER BHP B.M.E.P. LBS / □" R.P.M. MPH. 11 x 41 AXLE 7" x 20" TYRES | ||