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 plotting S.S. Oil Pressures against engine RPM for various valve and spring configurations.
| Identifier | ExFiles\Box 149\2\ scan0031 | |
| Date | 30th August 1929 | |
| S.S. OIL PRESSURES. ENGINE No S.S.15. STANDARD OIL PUMP. OIL TEMPERATURE = 60°C. STD. RELIEF VALVE. WEAK SPRINGS (V694). DURALUMIN BALL VALVES & WEAK SPRINGS (V694). DURAL. BALL & WEAK SPRING IN L.P. VALVE ONLY (NO BALL IN I.P. VALVE). OIL PRESSURE (LBS/SQ. IN.) RPM. OF ENGINE. MAIN PRESSURES. INTERMEDIATE PRESSURES. LOW PRESSURES OMITTED TO AVOID CONFUSION. | ||