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).
Request to use standard rocker covers instead of thin wall types on aluminium heads to reduce tappet noise.
| Identifier | ExFiles\Box 66a\2\ scan0233 | |
| Date | 1st April 1928 | |
| X.8090 BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} Hs{Lord Ernest Hives - Chair}4/LG2. 4. 28. RE. ROCKER COVERS. To confirm our verbal request to the D.O. The rocker covers for the aluminium head should be as present standard and not the thin wall type, as these bring up all tappet noises by 50%. The leather washer is not reliable. HS.{Lord Ernest Hives - Chair} | ||