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).
Engine road performance tests, focusing on ignition timing, detonation, and governor units.
| Identifier | ExFiles\Box 124\2\ scan0281 | |
| Date | 17th December 1940 | |
| - 4 - The road performance with the ignition set at 14° FTDC, is only a little better than 2.E.50 car with a standard B.111 engine, compression ratio 6:2:1, and the ignition set at TDC. A little better performance can be obtained by running on ETHYL fuel with the ignition set at,TDC, but the detonations are too bad to be considered. We found during these tests that after obtaining a non-detonating line by using a solid ignition governor unit with a vernier hand control, when suitable springs and weights had been fitted to give an identical line, we had to retard the ignition a matter of 5 or 6 degrees. In other words there is a difference of 5 - 6 degrees between a solid and a working governor unit, and it is a matter for investigation whether governor springs fluctuation under running conditions is responsible. (Continued) | ||