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).
Customer complaints of valve spring swish, identified as a surge period, for the 20/25 HP valve gear.
| Identifier | ExFiles\Box 107\3\ scan0126 | |
| Date | 13th April 1938 | |
| 561. W/N. Br/Bk.{A. Birkett - Commercial Manager} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/AP.13.4.38 20/25.HP. valve gear. Hq/WT. passed your memo Br/Bk{A. Birkett - Commercial Manager}/3/W.7.4.38 over to us regarding complaints of valve spring swish which actually is a surge period. As stated by OWH. some work has been carried out by us and the result achieved, namely by a different type of valve spring, which unfortunately is not available or suitable for the 20/25. One thing, however, that may have some bearing on one car being worse than another is slackness of the springs on the top and bottom spring washer spigots, as we know that excessive slack at these points does accentuate surge and such complaints cars may be checked on this point. Is the spring noise any worse than standard on this particular car (GED.34) or just that it is standard and this particular customer has noticed it.? If it is up to standard then it is a question of your own policy as to whether anything is done or not. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||