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).
Performance chart showing the estimated performance of a Bentley engine with boost against compression ratio.
| Identifier | ExFiles\Box 140\1\ scan0101 | |
| Date | 28th November 1934 | |
| FIG 3 BENTLEY ENGINE ESTIMATED PERFORMANCE WITH BOOST TO MAINTAIN MAX. PRESS. AT 800 LBS/D' BLOWER EFFY. 75 % " " 50 % Curve Labels: SP.{Mr Spinney} CONS. AT 2500 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. Axes: Bottom X-Axis: COMPRESSION RATIO (Values: 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.4) Left Y-Axis (Outer): BOOST AIR TEMP °C (Values: 0, 25, 50, 75, 100, 125, 150) Left Y-Axis (Inner): SUPERCHARGE RATIO (Values: 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2) Right Y-Axis (Outer): PTS/B.H.P./HR (Values: .500, .600, .700) Right Y-Axis (Inner): B.M.E.P. & B.H.P. (Values: 120, 140, 160, 180, 200) Bottom Right Corner: F.{Mr Friese} LL S. | ||