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).
List of ignition timing settings in degrees for the Phantom II model.
| Identifier | ExFiles\Box 65\1\ scan0237 | |
| Date | 16th July 1930 | |
| 16.7.30. PHANTOM II IGNITION TIMING. Degrees reckoned on engine flywheel. Battery hand range 30° Magneto " " 15° Automatic range 25° Full battery retard. 18° A.T.C. " magneto " 8° A.T.C. " battery advance 37° B.T.C. " magneto " 32° B.T.C. Battery hand advanced auto retarded. 12° B.T.C. Magneto hand advanced auto retarded. 7° B.T.C. Battery auto advanced hand retarded. 7° B.T.C. Magneto auto advanced hand retarded. 17° B.T.C. | ||