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).
Query regarding the valve spring load and pressure measurements for the S.I. Spectre.
| Identifier | ExFiles\Box 91\4\ scan0095 | |
| Date | 12th July 1935 | |
| X300 a HOTEL DE FRANCE. CHATEAUROUX. Indre. France. GWH{George W. Hancock - Head Chateauroux}/3/JAB. 12th July 1935. To. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From. G.W.H. 3. S. I. SPECTRECodename for Phantom III. We would like to draw your attention to the Valve Spring load. The free length of the Valve outer spring is 1.15/16 ". The working length with valve closed is 1.5/8 ". At this compression there is 66 lbs. pressure on the valve, with the inner and outer springs. Is this as designed ? ----------- G.W.H. | ||