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 volumetric efficiency curves, showing the effect of inlet valve diameter against engine speed.
| Identifier | ExFiles\Box 179b\3\ img219 | |
| Date | 20th September 1932 | |
| 4858_G 20-9-32 FIG. 3 VOLUMETRIC EFFICIENCY CURVES EFFECT OF INLET VALVE DIAMETER ON VOLUMETRIC EFFICIENCY STANDARD CONDITIONS VALVE TIMING: I.O. 7° LATE E.O. 30° EARLY I.C. 24° LATE E.C. 10° LATE LARGE INLET VALVES TO E 38891 TULIP SHAPED LARGE INLET VALVES - 2.050 DIA. STD. BUZZARD INLET VALVES - 1.850 DIA. VOLUMETRIC EFFICIENCY (%) ENGINE SPEED (R.P.M.) | ||