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 plotting the results of detonation tests on a single inlet high power cylinder head with various configurations.
| Identifier | ExFiles\Box 134\2\ scan0030 | |
| Date | 23th March 1938 guessed | |
| BENTLEY SINGLE CYLINDER TESTS SHEET 8. V1751. DETONATION TESTS: SINGLE INLET HIGH POWER HEAD HIGH POWER CYLINDER HEAD TO I.E.C. 4075. FLAT HEADED INLET VALVE 1.750" DIA. EXHAUST VALVE 1.500 DIA. (UNCOOLED) ZENITH CARBURETTOR (36 1/4" CHOKE) SILENCER FITTED FUEL = NO 1 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. CURVE ① - NORMAL GASKET (C.R.= 6.17) CURVE ② - .025" PACKING UNDER CYLINDER BLOCK. (C.R.= 6.03) CURVE ③ - THINNER GASKET (C.R.= 6.55) CURVE ④ - .014" MACHINED OFF HEAD TO BRING INLET VALVE HEAD ABSOLUTELY FLUSH WITH SAME. (C.R.= 6.23) CURVE ⑤ - AS 4, BUT WITH THINNER GASKET. (C.R.= 6.61) X-AXIS: RPM Y-AXIS: AUDIBLE RANGE OF DETONATION (FEET) | ||