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).
Design change to the Bentley Aluminium Cylinder Head valve seating angle.
| Identifier | ExFiles\Box 86\1\ scan0031 | |
| Date | 1st November 1933 | |
| To BT.{Capt. J. S. Burt - Engineer} from E/JNR.{Charles L. Jenner} c. Hs.{Lord Ernest Hives - Chair} RHS. X219 E/JNR.{Charles L. Jenner}3/HP.1.11.33. Bentley Aluminium Cylinder Head. We send you herewith drawing: LeC.3685 shewing a modification to the exhaust valve insert and the valve seating. On our previous design the angle of the seating was 30°. We now revert to 45°, and the amount of valve surface in contact with this seating follows our more usual practice. The 30° valve seats should not be proceeded with. E/JNR.{Charles L. Jenner} | ||