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).
Tests measuring heat added to the cooling system and the influence of hot spot temperature on engine detonation.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan95 | |
| Date | 14th January 1926 guessed | |
| contd :- -15- through the hot spot. A good number of tests to obtain an average value satisfied us that there was no appreciable increase when using the flow which gave us the maximum heating compared with using the full bore flow. It therefore seems that the heat added to the water for a given set of running conditions depends solely upon the boiler size. We have given the heat added to the cooling system in a curve expressed as a percentage of the total heat flow. The maximum value we find is approximately 6½% at 2000 r.p.m. [Graph] Title: HEAT ADDED AS %AGE OF HEAT GIVEN TO WATER BY CYLINDERS. Y-Axis Label: %AGE INCREASE Y-Axis Scale: 0, 5, 10 X-Axis Label: R.P.M. X-Axis Scale: 750, 1000, 1500, 2000 REV INFLUENCE OF HOT SPOT TEMPERATURE ON DETONATION. All the experiments were carried out on a Phantom engine having a compression ratio of 5.2 to 1. With this ratio and ordinary commercial shell Mex petrol - which was also employed throughout the tests - detonation was very severe at low speeds with full throttle. A test was made at 1000 r.p.m. full throttle contd :- | ||