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 compression pressures of Buick type and standard Bentley pistons against engine RPM.
| Identifier | ExFiles\Box 134\1\ scan0062 | |
| Date | 21th December 1937 | |
| -3- Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}2/AP.21.12.37 Fig.III. shows mean curves for the two types of pistons, with one ratio difference, and also a curve of the pressure which would be expected from theoretical considerations, if the standard Bentley ratio were increased to the FIG: III — BUICK TYPE PISTONS — COMPARISON OF COMPRESSION PRESSURES. COMPRESSION PRESSURE (LBS/D") 170 160 150 140 130 120 THEORETICAL PRESSURES (C.R = 7.4) BUICK PISTONS (C.R = 7.4) STANDARD BENTLEY (C.R = 6.4) 1,000 2,000 3,000 4,000 — R.P.M. — E.D. 2.12.37 continued | ||