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 a Bentley engine's performance.
| Identifier | ExFiles\Box 82\4\ scan0048 | |
| Date | 23th November 1934 | |
| FIG. 1 BENTLEY ENGINE ESTIMATED EFFECT OF VARYING C.R. MECH LOSS AT MAX TORQUE TAKEN AS 20 M.E.P. " " AT POWER " " 40 M.E.P. MAX B.M.E.P MAX B.H.P MAX TEMP MAX PRESSURE SP.{Mr Spinney} CONS AT 2,500 R.P.M. COMPRESSION RATIO MAX TEMP °C ABS MAX PRESSURE - LBS/SQ. IN. B.M.E.P. X B.H.P. PTS/BHP/HR F.{Mr Friese} LL. S. | ||