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 showing power variation with ignition timing for S.S. Engines.
| Identifier | ExFiles\Box 65a\3\ scan0077 | |
| Date | 15th July 1929 guessed | |
| V690 POWER VARIATION WITH IGNITION TIMING. (S.S. ENGINES) TESTS RUN ON ENGINE N° S.S.5. COMPLETE TEST BED EXHAUST SYSTEM (WITH CAR TYPE SILENCER & FISHTAIL) BAROMETER = 760 m/m.{Mr Moon / Mr Moore} INTAKE = 15°C MAXIMUM B.H.P. BRAKE HORSE POWER. B.H.P. WITH BOTH IGNITIONS SET AT 12° BEFORE T.D.C. (HAND CONTROL IN FULLY ADVANCED POSITION). DITTO, BUT SET AT 10° BEFORE T.D.C. R.P.M. OF ENGINE. | ||