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 comparing engine warm-up systems, with a graph showing temperature drop versus RPM.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan97 | |
| Date | 14th January 1926 guessed | |
| contd :- -17- 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. Data Line 1: SHELL-MEX. S.G. .74. Data Line 2: 50/50 MIXTURE. S.G. .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 in France was fitted with a water heated hot spot and this car was found to suffer more from piston knocks after its test than any of the previous cars equipped with standard hot spots. SUMMARY. WARMING UP FROM COLD :- The following, from results of tests and general observations, is the order of merit for warming up from cold :- (1) Standard exhaust heated system. (2) Superheated system. (3) Water Of course with increased boiler heating surface we should expect increased rate of heating and could probably make it even quicker in action than the standard. contd :- | ||