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 showing the power increase for a 20 HP engine due to various modifications.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 119 | |
| Date | 23th May 1927 guessed | |
| 20 H.P. POWER INCREASE DUE TO LONG DURATION OF VALVE LIFT, HIGHER COMPRESSION RATIO, LARGER VALVES, AND LOWER INDUCTION PIPE DEPRESSION. ENGINE N° 11-GTE COMPRESSION RATIO 5.45 to 1 LARGE VALVES (1.400 DIA) TWO ZENITH TRIPLE DIFFUSER TYPE CARBS. SPECIAL LONG DURATION CAMSHAFT. OPEN EXHAUST. THE DOTTED CURVE REFERS TO STANDARD ENGINE. Left Y-Axis: BRAKE HORSE POWER Bottom X-Axis: R.P.M. OF ENGINE Right Top Y-Axis: PETROL CONSUMPTION (PTS/BHP/HR) Right Bottom Y-Axis: B.M.E.P. (LBS PER SQ. IN.) Graph Labels: PETROL CONSUMPTION B.H.P B.M.E.P. | ||