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).
Report page analyzing the influence of fuel volatility on engine warm-up time, with a comparative graph.
| Identifier | ExFiles\Box 66a\1\ scan0101 | |
| Date | 2nd February 1926 guessed | |
| contd :- -16- INFLUENCE OF THE VOLATILITY OF THE FUEL ON TIME TAKEN FOR ENGINE TO OPERATE EVENLY. The volatility of the fuel naturally has considerable influence on the time taken before the motor will operate evenly on all cylinders when started up from cold. The fuel we employed for these tests (Shell Mex) was very poor in this respect but was useful in showing more clearly the difference between the heating systems. With Benzol 50/50 mixture - which has a higher volatility value than petrol - the all round operation of the engine was improved and differences existing between each system were not so marked as when using our standard testing fuel. The following curve is of interest in showing the temp. drop in the induction pipe and affords a comparison of the relative volatility of the two fuels. [Graph] Title: TEMP DROP IN INDN PIPE RELATIVE TO ENTERING AIR. FULL LOAD. Y-Axis: TEMP. REL TO AIR °C, RISE, DROP X-Axis: R.P.M., 750, 1000, 1500, 2000, 2500 Data Series 1: Shell Mex. Sg.{Arthur F. Sidgreaves - MD} .74. Data Series 2: 50/50 MIXTURE. Sg.{Arthur F. Sidgreaves - MD} .80. GENERAL OBSERVATIONS. Experience shows us that the "warming up" process is more rapid with the standard system than the others. The last Phantom to do the 10,000 miles test contd :- | ||