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 Brake Horsepower and Brake Mean Effective Pressure against RPM for different exhaust system configurations.
| Identifier | Morton\M19\ img273 | |
| Date | 1st November 1931 guessed | |
| RM.{William Robotham - Chief Engineer} P 33. LOSSES TO EXHAUST SYSTEM. PH. II SHORT TYPE. C.O. OPEN AND CLOSED 4.6 C/R 108° MARKED VALVE CAMSHAFT TWIN CARBS 1.4 CHOKES B.H.P 160 150 140 130 120 110 100 90 80 R.P.M. 500 1000 1500 2000 2500 3000 3500 B.M.E.P. 120 110 100 90 80 70 60 ① OPEN EXHAUST ② COMPLETE PH. II SHORT TYPE EXHAUST SYSTEM C.O. OPEN | ||