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 performance with boost for a Bentley engine against various ratios.
| Identifier | ExFiles\Box 82\4\ scan0050 | |
| Date | 28th November 1934 | |
| FIG 3 BENTLEY ENGINE ESTIMATED PERFORMANCE WITH BOOST TO MAINTAIN MAX PRESS. AT 800 LBS/SQ.IN. BLOWER EFFY 75% " " 50% SP.{Mr Spinney} CONS. AT 2,500 R.P.M. BOOST TEMP AT 4300 R.P.M. B.H.P. AT 4300 R.P.M. B.M.E.P. AT 2500 R.P.M. BOOST RATIO AT 4300 R.P.M. Y-AXIS LEFT (outer): BOOST AIR TEMP °C, 0, 25, 50, 75, 100, 125, 150 Y-AXIS LEFT (inner): SUPERCHARGE RATIO, 2.2, 2.0, 1.8, 1.6, 1.4, 1.2, 1.0 Y-AXIS RIGHT (outer): PTS/BHP/HR, .700, .600, .500 Y-AXIS RIGHT (inner): B.M.E.P. & B.H.P., 200, 180, 160, 140, 120 X-AXIS: COMPRESSION RATIO, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.4 F.I.L.S. | ||