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).
Engine performance graph showing Brake Horsepower, Brake Mean Effective Pressure, and valve timing against RPM.
| Identifier | Morton\M19\ img293 | |
| Date | 5th October 1931 guessed | |
| B.H.P. 140 130 120 110 100 90 80 R.P.M 500 1000 1500 2000 2500 3000 3500 B.M.E.P. LBS/SQ. 110 100 90 80 70 60 INDUCTION DEPN INS HG. 3 2 1 ① ② ③ Valve Timing Diagram: Ex 60 .013 CLCE. 2.2 12.7 IN 56.5 | ||