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).
Chart showing the variation in cylinder head temperature with fuel consumption and octane rating for two different engine models.
| Identifier | ExFiles\Box 150\1\ scan0220 | |
| Date | 30th January 1936 guessed | |
| FIG. 2 VARIATION IN CYLINDER HEAD TEMPERATURE WITH FUEL CONSUMPTION & OCTANE RATING (ASTM) CYLINDER HEAD TEMPERATURES °F SPECIFIC FUEL CONSUMPTION LBS/B.H.P.-HOUR 1930 CYCLONE 65 ASTM 73 ASTM 82 ASTM 1935 CYCLONE 73 ASTM 80 ASTM 87 ASTM 550 500 450 400 350 300 250 200 0.40 0.45 0.50 0.55 0.60 0.65 0.70 | ||