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 showing the Brake Horse Power and Brake Mean Effective Pressure for a modified 201P standard engine.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 133 | |
| Date | 24th September 1927 | |
| 201P POWER OUTPUT WITH THE FOLLOWING MODIFICATION TO STD. ENGINE. TWO ZENITH TRIPLE DIFFUSER CARBURETTERS COMPRESSION RATIO 5.45 To 1. LARGER VALVES 1.400" DIA. INLET CAM DURATION INCREASED BY 28° ON C'SHAFT. EXH. CAM DURATION 112° ON C'SHAFT. EXH CAM LEADS INLET CAM BY 120° CURVES WITH FREE EXHAUST. DOTTED CURVES SHEW POWER & MEP BEFORE STRONGER VALVE SPRINGS WERE FITTED. BRAKE HORSE POWER ENGINE R.P.M. BRAKE MEAN EFFECTIVE PRESSURE lbs/sq" B.H.P. B.M.E.P. ack/mj 24/9/27 | ||