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).
Secret memorandum concerning the practice of fitting piston stops and associated leakage risks.
| Identifier | WestWitteringFiles\M\Jan1925-March1925\ Scan50 | |
| Date | 23th March 1925 | |
| ORIGINAL TO R.{Sir Henry Royce} FROM E.{Mr Elliott - Chief Engineer} SECRET. E5/M23.3.25. Copy to - C.J. " HS.{Lord Ernest Hives - Chair} " BY.{R.W. Bailey - Chief Engineer} INDIA PISTON STOPS. X5040 Further to our remarks concerning the above in E1/M23.3.25., we think the stops ought to be filed away below the surface even if in different material to avoid the risk of them coming loose. This is especially so in view of the fact that it is Derby practice to counterbore the hole for the stop pin to the depth of the ring groove, with a drill .013 to .018 larger than the pin. We should like to see this practice discontinued if possible to avoid the leakage which necessarily occurs around the pin and behind the piston ring. E.{Mr Elliott - Chief Engineer} | ||