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).
Governor spring and ignition advance performance with varying oil conditions and viscosity.
| Identifier | ExFiles\Box 65\1\ scan0024 | |
| Date | 15th December 1924 guessed | |
| contd :- -3- Even with the strong governor springs, the return is very erratic when the oil is cold. (4) We have not quite the full range on the governor advance. This is due to the location of the piston operating lever faik allowing loss of movement, as observed at WW. Revising limits of the details should eliminate this. We find that when the oil is warm, the ignition advance taken with ascending and descending engine speeds does not vary appreciably. We can get the required settings on the hand control quadrant, and in addition to the 30° on the battery ignition two or three additional degrees. With a spring we have in hand, slightly weaker than spring 'B' and a commencement of automatic advance of 22° instead of 20° B.T.D.C. We anticipate that we shall get an ignition advance curve that will not result in any loss of power. The main trouble with the oil relay seems to be that with governor weights of the present proportions we cannot use a control spring that has a sufficient margin of strength to deal effectively with the return of the inner piston under conditions of maximum oil viscosity or impurity. Hs.{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||