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).
Specification for double valve springs for oil adjusted tappets on the Phantom engine.
| Identifier | ExFiles\Box 17\6\ Scan164 | |
| Date | 23th October 1933 | |
| To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 17060. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/KT.23.10.33. OIL ADJUSTED TAPPETS FOR THE PHANTOM ENGINE: We give below the specification of the double valve springs which we find necessary for the large inlet valves on this engine :- DOUBLE TAPER SPRINGS. Outer Springs Hs.{Lord Ernest Hives - Chair}664. Free length 2.75". Load when compressed to 2" = 75 lbs. " " " to 1.5" = 130 lbs. Inner Springs Hs.{Lord Ernest Hives - Chair}665. Free length 2.2". Load when compressed to 2" = 7 lbs. " " " to 1.5" = 30 lbs. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||