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 comparing the detonation characteristics of different fuels in a Bentley III engine.
| Identifier | ExFiles\Box 97\1\ scan0132 | |
| Date | 1st March 1938 guessed | |
| BENTLEY III COMPARISON OF FUELS AS AFFECTING DETONATIONS TESTS WITH COMPLETE BENTLEY III SILENCER (1 1/2" CARBS.) WRAITH HEAD .100 MACHINED OFF FACE 119 C.CS. WITH .050 GASKET COMP. RATIO 6.3:1 MAX. POWER ① ESSO ETHYL (LEAD FUEL) ② RED LINE (NO 3 FUEL) ③ SHELL (NO 1 FUEL) A CURVES REPRESENT NON DETONATING LINES. DEGREES ADVANCE BEFORE T.D.C. M.E.P. LBS/☐" R.P.M. | ||