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).
Detonation tests comparing Ethyl and Dominion fuels to assess the safety of an increased compression ratio.
| Identifier | ExFiles\Box 83\2\ scan0134 | |
| Date | 11th November 1937 | |
| 72- (2) Detonation tests. Using Ethyl there was no audible detonation either at T.D.C. or 5° Early. Using Dominion there was noticeable detonation at T.D.C. from 20 - 40 M.P.H. It was necessary to retard 5° late to eliminate all noticeable detonation using Dominion. The timed performance shows only a slight loss when retarded 5° late and this would not be easy to detect without taking stop watch figures. There was no measurable difference between T.D.C. and 5° early. These results indicate that we can with safety try the increased compression ratio as proposed. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} | ||