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).
Exhaust valve seat hammering on a 25 HP engine.
| Identifier | ExFiles\Box 106\5\ scan0144 | |
| Date | 22th December 1934 | |
| X5060 To By: Hs{Lord Ernest Hives - Chair}/Smth.7/KW.22.12.34. Exhaust Valve Seat Hammering - 25 HP. Hancock reports bad exhaust seat hammering on 21-G-IV, causing a ridge on the bottom of the seat. The throat diameter of the seat is the same as the inner diameter of the valve face and we suggest that the throat should be opened out slightly. Will you please detail this modification. Hs{Lord Ernest Hives - Chair}/Smth. | ||