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 of Brake Horse Power (BHP) against RPM, with camshaft timing diagrams for a standard 25 HP and a Bensport camshaft.
| Identifier | ExFiles\Box 179b\3\ img028 | |
| Date | 12th January 1933 guessed | |
| B.H.P 30, 40, 50, 60, 70, 80, 90, 100 R.P.M 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 STD 25 H.P. CAMSHAFT E 57122 IN EX 40 45 110.5° .020 4.965 BENSPORT CAMSHAFT L.E.C. 3268 E 53272 T.D.C. 8.7° IN EX 55 45 113.5° .020 | ||