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).
Note on the performance of two batches of taper valve springs, one successful and one a failure.
| Identifier | ExFiles\Box 80\3\ scan0163 | |
| Date | 18th August 1913 | |
| Mr Wormald Y.290 These valve springs were the first taper springs E 2614, they were not exact to the Drg, we tested them & got excellent results. Another batch was ordered but these did not turn out any better than the standard. There was a talk of changing all valve springs when the first taper ones were so good, but it fell thro after the failure with the second batch JH 18/8/13 | ||