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).
Inadvisability of using a larger diameter thread for Bentley exhaust valve seats.
| Identifier | ExFiles\Box 88\4\ scan0038 | |
| Date | 15th November 1933 | |
| [handwritten] Rm{William Robotham - Chief Engineer} x2r+ [/handwritten] To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from E.{Mr Elliott - Chief Engineer} E.15/HP.15.11.33. c.By. Exhaust Valve Seats - Bentley. Replying to your memo Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/KT.7.11.33 with respect to report Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation}6/KT.7.11.33 I do not think that we can go to a larger diameter of thread than shown on LeC.3685 because of the danger of cracking the aluminium bar between the valve seats. E.{Mr Elliott - Chief Engineer} | ||