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 power tests for an 8.1 Litre Phantom engine, contrasting early and late valve timing with an open exhaust.
| Identifier | ExFiles\Box 92\2\ scan0188 | |
| Date | 8th December 1935 | |
| Hs.{Lord Ernest Hives - Chair} 1226 8.1 LITRE PHANTOM POWER TESTS (OPEN EXHAUST) COMPARISON BETWEEN EARLY AND LATE VALVE TIMING CURVES WITH 6:1 RATIO HEAD - LARGE INLET VALVES (Ex 12011) 2.000 DIA THROAT 14 M/M SPARK PLUGS KLG 765A - DOUBLE TAPER VALVE SPRINGS 2 - 1 7/8 BORE SU CARBS - 1 1/4 BALANCE HOLE A IO 6° BTDC EO 58° BBDC IC 48° PBDC EC TDC EARLY TIMING B IO 1.5° PTDC EO 51° BBDC IC 52° PBDC EC 7.5° PTDC LATE TIMING BHP RPM MEP (LBS □") PLR 8-12-35 | ||