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).
Quoting Mr Royce on valve spring experiments and performance comparisons.
| Identifier | ExFiles\Box 80\3\ scan0250 | |
| Date | 28th August 1913 | |
| Wor{Arthur Wormald - General Works Manager}/EM50/L27813. File Re Valve Springs X.286, X.316, X.280, X.312/3/4 and X.369 Mr Hives. 28-8-13. Na.{Mr Nadin} E.{Mr Elliott - Chief Engineer} The following is an extract from Mr Royce's memo R3/P21813:- "So far I have the impression that no one can make springs to beat Salters, except it may be ourselves. The Terry's springs should be particularly noted, but all these springs should be compared with others of equally high stresses. "The valve spring experiment is over providing we use either our own springs or Salters and we use increased section of metal, lately instructed from Le CanadelHenry Royce's French residence, and we prevent the valve cams leaving the seats, that is, we must put rather higher limits on the speed in which the valves leave the seats, but not much higher, as this is such a good safety valve to prevent over-running of the engine." p. Wor.{Arthur Wormald - General Works Manager} | ||