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 on Engine No S.S.5.
| Identifier | ExFiles\Box 65\1\ scan0228 | |
| Date | 27th September 1929 guessed | |
| V690 POWER VARIATION WITH IGNITION TIMING. (S.S. ENGINES) TESTS RUN ON ENGINE No S.S.5. COMPLETE TEST BED EXHAUST SYSTEM, (WITH CAR TYPE SILENCER & FISHTAIL) BAROMETER = 760 M/M.{Mr Moon / Mr Moore} INTAKE = 15°C BRAKE HORSE POWER. R.P.M. OF ENGINE. MAXIMUM B.H.P. 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. | ||