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).
Depot modification to heavy exhaust valves for the Phantom II model to overcome quietening issues.
| Identifier | ExFiles\Box 131\4\ scan0355 | |
| Date | 30th June 1937 | |
| E- (struck through) c.Hs.{Lord Ernest Hives - Chair} Rm.{William Robotham - Chief Engineer} Ey. Da.{Bernard Day - Chassis Design}1/HP.30.6.37. Phantom II. Depot modification to Heavy Exhaust Valves, to overcome difficulty of quietening valves in service. Attached are remarks by E/McStay. giving history of these valve failures and modifications. The point is that the valves as modified by GWH.{George W. Hancock - Head Chateauroux} are practically the same as those shewn on LeC.3960, which have done some running, but we do not know whether it is enough to justify their adoption for replacements. Perhaps Rm.{William Robotham - Chief Engineer} can say. Da.{Bernard Day - Chassis Design} | ||