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).
Use of longer inlet cams and the performance of different valve springs for various engines.
| Identifier | ExFiles\Box 66a\2\ scan0054 | |
| Date | 13th August 1927 | |
| RG.{Mr Rowledge} Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} c. to BJ. X 8060 R1/M13.8.27. PHANTOM, GOSHAWK, CONDOR X.3822 X.8060 FALCON. X.2993 X.5060 X.3616 Unless we know of some disadvantage of the longer inlet cam it should be used on all engines, because it reduces the risk of detonations at slower, and makes the valve spring situation easier. All new valve springs that are being made should be of low max. stress type, or at least with better figure of merit, by our formula not less than 1. From our latest investigations, to obtain the best figure of merit in a given valve spring space we find the 50% range type the best. Condor E.15421 and DES.96. are particularly bad ones which must be avoided at once. R.{Sir Henry Royce} | ||