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 spring rating chart for a Lorraine-Dietrich engine.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 130 | |
| Date | 29th March 1927 | |
| (13) LORRAINE-DIETRICH ENGINE. VALVE SPRING RATING CHART. 29-3-27 LOAD (LBS.) 50 40 30 20 10 0 VALVE LIFT (INCHES) VALVE CLOSED. .1 .2 .3 .4 VALVE OPEN. RESULTANT. OUTER SPRING. INTERMEDIATE SPRING. INNER SPRING. | ||