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 for performance curves showing power variation with valve lift on a Small Universal Single Cylinder Unit, for development on the Wraith and Spectre models.
| Identifier | ExFiles\Box 133\2\ scan0128 | |
| Date | 12th December 1934 | |
| Le Smith x100 3 To. Hs{Lord Ernest Hives - Chair}/Wo. Copy to B. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} E/PSN.4/MN.12/12/34. Small Universal Single Cylinder Unit. We should be pleased if you could provide us with some curves showing the variation of power with valve lift on the standard Bentley head on the above unit. This is of particular interest to us as it may be necessary on the Wraith and SpectreCodename for Phantom III to reduce the valve lift in order to keep the spring load within reasonable limits with silent tappets and short duration camshafts. E/PSN. | ||