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).
Power comparison report between a high power inclined valve head and a standard 3.5 litre Bentley.
| Identifier | ExFiles\Box 134\2\ scan0122 | |
| Date | 9th July 1937 guessed | |
| HIGH POWER HEAD. Power comparison. The inclined valve head was compared with standard Bentley, both with a dry liner alum. block and a cast iron block. The basis of comparison was (a) maximum power on a non detonating fuel, and (b) power on a paraffin-shell mixture allowing 6" of detonation. The percentage gain are as under, the figures being a comparison between (1) Standard 3½ litre Bentley, C.R. 6.4 (2) High power unit, cast iron block, C.R. = 6.4 | R.P.M. | 1000 | 1500 | 2000 | 2500 | 3000 | 3500 | 3750 | 4000 | 4250 | 4500 | |---|---|---|---|---|---|---|---|---|---|---| | Max. Power | 6.4 | 9.10 | 9.30 | 5.00 | 5.84 | 10.70 | 15.70 | 21.80 | - | - | | 6" Detn. | 7.2 | 11.05 | 9.56 | 9.20 | 10.72 | 14.00 | 19.10 | 20.60 | - | - | These results would tend to indicate that the detonation properties of the high power unit are rather better than the standard Bentley. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} | ||