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 of detonation intensity versus RPM for four different high power head configurations.
| Identifier | ExFiles\Box 134\2\ scan0134 | |
| Date | 10th August 1937 | |
| FIG 2. DETONATION ON HIGH POWER HEADS. DETONATION INTENSITY (FT) R.P.M. ① No 1 HEAD - UNCOOLED EXHAUST VALVE C.R. = 6.4 ② No 2 HEAD UNCOOLED EXHAUST VALVE C.R. = 6.23 THROAT AREA 14% GREATER THAN FOR 1. ③ AS 2 BUT WITH COOLED EXHAUST VALVE. (STEM ONLY) IN S/SLV. GASKET FOR ABOVE = .048 ALUM. VALVE TIMING I.O 2° E; I.C. 28° L; E.O. 51° E; E.C. 7° L; ④ INCLINED VALVE HEAD WITH DRY LINER BLOCK. UNCOOLED EXHAUST VALVE; C.R. = 6.4 GASKET = .010" KLINGERITE, THROAT AREA. 55% GREATER THAN 1. E.D. / 10.8.37 | ||