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 illustrating the effect of reduced oil pressure and increased oil temperature on ignition advance versus engine RPM.
| Identifier | ExFiles\Box 65\1\ scan0050 | |
| Date | 1st January 1925 | |
| OIL RELAY ADVANCE EFFECT OF REDUCED OIL PRESSURE AND INCREASE OIL TEMP FLYWHEEL & IGNITION ADVANCE MAX ADV MIN ADV STEEL PISTON DIA .618" INITIAL SPRING DEFLECTION 8° GOVERNOR SPRINGS GIVE 1 LBS 9 1/2 OZ LOAD AT .475 RAD. WHEN DEFLECTED THROUGH 78° ---x--- NORMAL OBSERVED CURVE. OIL PR.{Percy H. Rose} 23-32 LBS/D" TEMP 45°C - - - - ABNORMAL OBSERVED CURVE OIL PR 6-18 LBS/D" TEMP 80°C ENGINE R.P.M. HS{Lord Ernest Hives - Chair}/R~ | ||