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 necessary ignition advance versus engine RPM for Lighter Phantom and Lorraine-Dietrich engines.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 123 | |
| Date | 17th March 1927 | |
| 7 DEGREES ADVANCE BEFORE T.D.C. 50° 40° 30° 20° 10° LIGHTER PHANTOM WITH CYL. HEAD TO L.C.'2229. ONE IGN. TWO IGNS. LORRAINE. ONE IGN. TWO IGNS. LORRAINE-DIETRICH ENGINE. NECESSARY IGNITION ADVANCE. R.P.M. OF ENGINE. 1000 1500 2000 2500 3000 3500 17-3-27 | ||