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 plotting Brake Horse Power and Brake Mean Effective Pressure against RPM to show power losses from different exhaust system configurations.
| Identifier | ExFiles\Box 14\6\ Scan223 | |
| Date | 2nd November 1931 guessed | |
| RM.{William Robotham - Chief Engineer} P 33 LOSSES TO EXHAUST SYSTEM. PH. II SHORT TYPE. C.O OPEN AND CLOSED 4.G.C/R 108° MASKED VALVE CAMSHAFT TWIN CARBS. 1.4 CHOKES OPEN EXHAUST ① COMPLETE PH SHORT TYPE EXHAUST SYSTEM C.O. OPEN ② B.H.P 160 150 140 130 120 110 100 90 80 B.M.E.P. 120 110 100 90 80 70 60 R.P.M 500 1000 1500 2000 2500 3000 3500 | ||