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 the necessary ignition advance curves for a Lorraine-Dietrich engine against a Lighter Phantom engine.
| Identifier | ExFiles\Box 22\4\ Scan104 | |
| Date | 17th March 1927 | |
| 7 LIGHTER PHANTOM WITH CYL. HEAD TO L.C. 2229. ONE IGN. TWO IGNS. DEGREES ADVANCE BEFORE T.C. LORRAINE ONE IGN. TWO IGNS. LORRAINE-DIETRICH ENGINE. NECESSARY IGNITION ADVANCE. R.P.M. OF ENGINE. 50° 40° 30° 20° 10° 1000 1500 2000 2500 3000 3500 17-3-27 | ||