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 showing detonation tests comparing different types of inlet valves.
| Identifier | ExFiles\Box 134\2\ scan0032 | |
| Date | 23th March 1938 guessed | |
| BENTLEY SINGLE CYLINDER TESTS SHEET 10. V1753. DETONATION TESTS: COMPARISON OF TYPES OF INLET VALVES HIGH POWER CYLINDER & HEADS TO L.E.C. 4075, 4123 & 4157. EXHAUST VALVE = 1.500 DIA. (UNCOOLED) ZENITH CARBURETTOR (36 m/m CHOKE) SILENCER FITTED FUEL No1 SHELL VALVE TIMING: I.O. 2°E.{Mr Elliott - Chief Engineer} I.C. 28°L. E.O. 51°E.{Mr Elliott - Chief Engineer} E.C. 7°L. AUDIBLE DETONATION RANGE (FEET) B.M.E.P. (LBS/SQ.IN.) R.P.M. SINGLE FLAT HEADED INLET VALVE SINGLE TULIP HEADED INLET VALVE TWIN INLET VALVES | ||