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).
Phantom rocker brackets, recommending a return to all-steel versions due to uneven expansion issues.
| Identifier | ExFiles\Box 66a\2\ scan0235 | |
| Date | 12th July 1928 | |
| x8090 To BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} Hsl/LG12.7.28. RE. PHANTOM ROCKER BRACKETS. x8090 x8060 Owing to the uneven expansion of the steel and duralumin brackets causing uneven valve clearance, we should suggest that we go back to all steel brackets as soon as possible. This would also lessen the trouble experienced of the biting in of the rocker bearings into the brackets. As reported we should lift the present steel bracket .003" to overcome the unequal expansion. Hs.{Lord Ernest Hives - Chair} | ||