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 detonation, B.M.E.P., and ignition advance in Close-Centres vs. Standard Heads for Bentley Single Cylinder Tests.
| Identifier | ExFiles\Box 133\2\ scan0126 | |
| Date | 12th December 1934 guessed | |
| BENTLEY SINGLE CYLINDER TESTS SHEET 7 DETONATION COMPARISON: CLOSE-CENTRES & STD. HEADS. EXHAUST SILENCED TO DETECT DETONATION. NATURALLY ASPIRATED ZENITH TRIPLE DIFFUSER CARBURETTOR (32% CHOKE) NORMAL BENTLEY TIMING COMPRESSION RATIO: CLOSE-CENTRES = 6.35, STD BENTLEY = 6.4 FUEL = NO 1 SHELL AUDIBLE RANGE OF DETONATION (FEET) B.M.E.P. (LBS/SQ.IN.) NECESSARY IGNITION ADVANCE (FLYWHEEL DEGREES) R.P.M. CLOSE-CENTRES HEAD STD BENTLEY HEAD | ||