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).
Test report table comparing performance data for an N.S. Unit and an O.S. Unit under various mechanical configurations.
| Identifier | ExFiles\Box 106\2\ scan0182 | |
| Date | 23th December 1937 | |
| 23.12.37. | | N.S. Unit | O.S. Unit | Diff. | Total | |---|---|---|---|---| | | Valve lift .020" | Valve lift .012" | | | | (1) As received. | 60 | 34.6 | 25.4 | 94.6 pts/hr. | | (2) Springs equalized at 1 1/4 lb. at .25". | 48 | 37 | 11 | 85 | | (3) Units changed over diaph. springs as in 2. | 40 | 43.5 | 3.5 | 83.5 | | (4) Springs changed. Diaph. as in 1. | 44.5 | 44.5 | - | 89 | | (5) Complete unit changed. | 42 | 46 | 4 | 86 | | (6) Units complete as in 2. | 53 | 39.9 | 13.1 | 92.9 | | (7) As in 2 valves lapped in. | 51 | 40.5 | 10.5 | 91.5 | | (8) As in 2 valve cages changed. | 50 | 42.5 | 7.5 | 92.5 | | ||