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 engine power output with various carburettors and air silencer setups.
| Identifier | ExFiles\Box 155\1\ scan0038 | |
| Date | 28th July 1932 guessed | |
| COMPARISON OF POWER OUTPUT., RM{William Robotham - Chief Engineer} P 58., VARIOUS CARBS. OPEN EXHAUST., 114° CAMSHAFT E.82448 DOUBLE VALVE SPRINGS., 5.25 C.R., B.H.P., 180, 170, 160, 150, 140, 130, 120, 110, 100, R.P.M., 500, 1000, 1500, 2000, 2500, 3000, 3500, M.P.H. 11x41 AXLE, 7x20" TYRES., 70, 80, 90, 2 SU CARBS., SEMI-EXPANDER., STD: CARB: NO AIR SILENCER., STD AIR SILENCER., T.D.C. 12.5, IN, 50.5, EX, 59.5, O/S CLGE. | ||