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).
Valve spring loadings and the use of a common spring for different engines.
| Identifier | ExFiles\Box 88\4\ scan0196 | |
| Date | 25th January 1937 guessed | |
| – sheet 2 – This naturally means that we are using relatively lower spring loadings. The Bentley Spring in this case is similar to the one that was reproduced with American materials to our design, to withstand the climatic conditions on the Bentley running in America. We are anxious not to depart from this state of affairs with the shorter duration timing, and if you will in due course let us know what the bouncing speed is we will make a comparison. This lower stress valve spring LeC.5417 is suitable for use on all car engines, assuming the Phantom III without the hydraulic adjusting tappets. The desirability of using a common valve spring in this way is self-evident. E.{Mr Elliott - Chief Engineer} | ||