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).
Awaiting the results of piston modifications to prevent knocking and piston pin difficulties.
| Identifier | ExFiles\Box 66\1\ scan0073 | |
| Date | 18th November 1925 | |
| To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} X. 8040 R3/M18.11.25. MODIFIED PISTONS. We are anxiously awaiting the result of the modification to the pistons (giving the opportunity of greater flexibility of skirt), to prevent knocking, and difficulties of piston pins in pistons. R.{Sir Henry Royce} | ||