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 the performance characteristics (BHP and BMEP) of Standard and Sports Phantom engines.
| Identifier | ExFiles\Box 29\3\ Scan186 | |
| Date | 23th February 1928 guessed | |
| COMPARISON OF STANDARD & SPORTS PHANTOM ENGINES, STD. ENGINE, COMP. RATIO = 4.1, FLAT CYLINDER HEAD, STD. INDUCTION PIPE, SPORTS ENGINE, COMP. RATIO = 4.75, ANTI-DETONATING CYL. HD.{Mr Hayward/Mr Huddy}, WEIR INDN PIPE (SK 965), VERTICAL CLAUDEL HOBSON CARBURETTOR ON WEIR PIPE, B.H.P., STANDARD ENGINE, SPORTS ENGINE, B.M.E.P., STANDARD ENGINE, SPORTS ENGINE, BRAKE HORSE POWER, R.P.M. OF ENGINE, B.M.E.P. (LBS/SQ"), V251. | ||