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 exhaust valve temperatures against specific consumption for different engine setups and fuel types.
| Identifier | ExFiles\Box 106\5\ scan0169 | |
| Date | 31th July 1936 guessed | |
| 25/30 HP EXHAUST VALVES (TEMPERATURE) SP{Mr Spinney}37 B9 UNIT COMP RATIO 6:1 E.60660 ① INLET VALVE E.60892 (1.400) EXH. VALVE EX 22459 (1.225) STROMBERG DC 42 CARB 1.500 BORE IRON PIPE SPEC CONS LOOPS AGAINST EXH VALVE TEMP ② LONGER EXH. VALVE GUIDES x R.M. 27 FITTED SHELL Nº1 ETHYL EXHAUST VALVE TEMP °C 900 800 700 PTS/BHP/HR .400 .500 .600 .700 .800 WM RICH WEAK WM = WEAKEST MIXTURE TO MAINTAIN MAX POWER | ||