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 showing the estimated effect of varying compression ratio on Bentley engine performance.
| Identifier | ExFiles\Box 140\1\ scan0099 | |
| Date | 23th January 1934 | |
| FIG. 1 BENTLEY ENGINES ESTIMATED EFFECT OF VARYING C.R. MECH. LOSS AT MAX. TORQUE TAKEN AS 20 M.E.P. " " " POWER " " 40 M.E.P. MAX. TEMP ° C ABS. MAX. PRESSURE LBS / SQ IN COMPRESSION RATIO B.M.E.P & B.H.P. PTS / B.H.P / HR. MAX B.M.E.P. MAX B.H.P. MAX. TEMP MAX. PRESSURE SP.{Mr Spinney} CONS AT 2,500 R.P.M. F.{Mr Friese} I. L. S. 23 . 1 . 34 | ||