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 plotting power output results from Bentley single cylinder tests on a twin inlet high power head.
| Identifier | ExFiles\Box 134\2\ scan0023 | |
| Date | 23th April 1957 guessed | |
| BENTLEY SINGLE CYLINDER TESTS SHEET 1A V1770 POWER OUTPUT - TWIN INLET HIGH POWER HEAD FOR CONDITIONS OF TEST SEE SHEET 1 COMPRESSION RATIO = 6.8 COMPRESSION RATIO = 6.13 BRAKE HORSE POWER B.M.E.P. (LBS/SQ IN) SP.{Mr Spinney} FUEL CONS. (PTS/BHP/HR) R.P.M. | ||