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).
Response to reports from France concerning issues with transmission rattles, rear engine mounting, and Peregrine carburettors.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page063 | |
| Date | 23th November 1932 | |
| G.W. Hancock Hotel de France, Chateauroux, Indre, France. X4057. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/AD23.11.32. Many thanks for your reports. Rattles in the Transmission. We are glad that the drilled rubbers in the clutch have been so successful in eliminating transmission rattles. We are afraid, however, that they are likely to deteriorate especially if the clutch is used hard and much heat is generated. We are carrying out tests here to prove this point but in the meantime we should like you to note particularly whether your immunity from transmission periods is maintained. Rear Engine Mounting. We were very interested to note your success with rubber rear engine mounting. We shall certainly try and get the designers to give us something of this sort for Peregrine. Carburetters. We have found a depressing number of faults with Peregrine carburetter and are struggling with them. The worst feature is the balance of the carburetter. With the scheme you have running in France there is 3" of water depression on the float chamber at high speeds and correspondingly less at the lower speeds. Therefore when we take the plug out of the float chamber lid{A. J. Lidsey} we richen up the flat spot from 30 to 50 M.P.H. but make the mixture at the top so rich that we cannot run at all. We found that the low speed choke you have is very bad for building up and when accelerating at full throttle from 30 to 50 M.P.H. fuel falls back out of the air stream after leaving the low speed choke. At 4,000 R.P.M. we find that the carburetter is very susceptible to throttle position and the distribution becomes very erratic when the throttle is partially closed. We are struggling with all these problems. | ||