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 plotting B.HP, B.M.E.P., Brake Thermal Efficiency, and fuel consumption against R.P.M., including a valve timing diagram.
| Identifier | Morton\M4.2\ img017 | |
| Date | 1st January 1923 guessed | |
| VALVE TIMING E.C. I.O. I.C. E.O. 5° 45° 40° B.H.P. 120 100 80 60 40 20 500 1000 1500 2000 2500 R.P.M. B.M.E.P. BRAKE THERMAL EFFCY. B.H.P. PTS/BHP./HR. B.M.E.P. lbs/□" 120 110 100 90 80 THERMAL EFFCY. % .30 .25 .20 CONSUMPTION PTS/HP./HR. .70 .60 .50 | ||