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 graph comparing the improved power output of an experimental 20 HP engine against a standard model.
| Identifier | WestWitteringFiles\Q\2-July1927-September1927\ 126 | |
| Date | 21th September 1927 | |
| IMPROVED POWER OUTPUT OF 20 H.P. R.R. ENC. No 11 GII. COMPRESSION RATIO = 5.45 TO 1. LARGE VALVES (1.400 DIA). LONG DURATION CAMSHAFT. STROMBERG VERTICAL CARBURETTER. T SHAPED INDUCTION MANIFOLD. SPECIAL EXHAUST MANIFOLD WITH 2" DOWN PIPE. SMALL HOT SPOT. STIFFER VALVE SPRINGS. CURVE CORRECTED TO N.T.P. B.H.P. ENG R.P.M. PTS/B.H.P./HOUR. B.H.P. EXP. ENGINE B.H.P. STD 20 H.P. CONSUMPTION STD 20. H.P. CONSUMPTION EXP. ENGINE STAMP: 21 SEP 1927 DERBY 21-9-27. aclp. | ||