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).
Valve springs rating chart for the Lorraine-Dietrich engine.
| Identifier | ExFiles\Box 5a\5\ 05-page030 | |
| Date | 29th March 1927 | |
| [ "13", "LORRAINE-DIETRICH ENGINE.", "VALVE SPRINGS RATING CHART.", "LOAD (LBS.)", "50", "40", "30", "20", "10", "RESULTANT.", "OUTER SPRING.", "INTERMEDIATE SPRING.", "INNER SPRING.", "VALVE LIFT (INCHES)", "0", ".1", ".2", ".3", ".4", "VALVE CLOSED", "VALVE OPEN" ], | ||