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 of Brake Mean Effective Pressure (B.M.E.P.) vs engine speed (R.P.M) for a PII standard engine with two different exhaust configurations.
| Identifier | ExFiles\Box 92\2\ scan0123 | |
| Date | 3rd June 1931 | |
| CURVE 2A. PII B.M.E.P CURVES STANDARD ENGINE A.{Mr Adams} TWIN CARBS. 1.300 CHOKES (COMPLETE SILENCER CUT OUT OPEN.) B. " " " " " ( " " CUT OUT SHUT) BMEP R.P.M. A B R.W.S. 3-6-31 | ||