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).
Performance graph comparing the Standard and Sports Phantom engines, showing Brake Horse Power and Brake Mean Effective Pressure against RPM.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan198 | |
| Date | 15th February 1921 | |
| 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 (SCH 965). VERTICAL CLAUDEL HOBSON CARBURETTOR ON WEIR PIPE THIS IS AN EXPERIMENTAL CURVE ONLY. THE CLAUDEL IS OF COURSE IMPOSSIBLE FOR LOW SPEED ACCELERATION. B.H.P. STANDARD ENGINE SPORTS ENGINE B.M.E.P. STANDARD ENGINE SPORTS ENGINE Y-AXIS LEFT: BRAKE HORSE POWER Y-AXIS RIGHT: B.M.E.P. (LBS / □") X-AXIS: R.P.M. OF ENGINE. | ||