Graph comparing power tests between early and late valve timing on an 8.1 Litre Phantom engine.
| Identifier | ExFiles\Box 123\3\ scan0068 | |
| Date | 8th December 1938 | |
| 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 {Mr Moon / Mr Moore} /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 o") RHR | ||
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).