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 of ignition advance in flywheel degrees versus engine RPM for two engines with a 4-1 compression ratio.
| Identifier | ExFiles\Box 65\1\ scan0051 | |
| Date | 1st November 1925 | |
| E.A.C. IGNITION ADVANCE REQUIRED. 48685. 1/11/25. IGNITION ADVANCE. FLYWHEEL DEGREES. ----- MAX POWER MAINTAINED. ----- POWER DROPS 4%. 4-1 COMPRESSION RATIO. CURVES OBTAINED FROM TWO ENGINES. VARIATIONS IN READINGS SHEWN. ENGINE R.P.M. He/Rm.{William Robotham - Chief Engineer} | ||