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 obtain 30 stronger valve springs for a 20 HP model, with detailed specifications.
| Identifier | ExFiles\Box 106\5\ scan0010 | |
| Date | 1st August 1927 | |
| To RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X5060 Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}4/LC16. 8. 27. 20 HP. STRONGER VALVE SPRINGS. Will you please obtain for us 30 springs to the specification given below :- Outer dia............. 1.263" Inner dia............. .975" Free length........... 1.837" Wire dia.............. .144" (9 S.W.G.) No. of working coils .. 5 1/3. Total No. of coils .... 7.000. Load to compress to 1.450" .. 42 lbs. ± 1 lb. Length choc-a-bloc not to exceed............... 1.020". Ends to be ground square. Spring to be black enamelled after being examined for cracks. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||