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).
Testing requirements for engine clearances, tappet noise, and a trial twin exhaust manifold.
| Identifier | ExFiles\Box 155\2\ scan0138 | |
| Date | 3rd September 1937 | |
| 3. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 1/WH.3.9.37. Included in tests should be the smallest clearance which can be used not to impair slow running. Tappet noise with various clearances should also be noted. An alternative twin exhaust manifold to Rm.{William Robotham - Chief Engineer}438 has been made for trial. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||