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).
Adoption of parallel piston rings for aero and car engines.
| Identifier | ExFiles\Box 16\1\ Scan129 | |
| Date | 31th December 1914 | |
| To Na.{Mr Nadin} from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} " " E.{Mr Elliott - Chief Engineer} " Wor.{Arthur Wormald - General Works Manager} for EH. -9815 R6/IB312114. 31st. December, 1914. COPY Re Piston Rings. Na{Mr Nadin}1/S241214. With reference to Piston Rings, I quite agree it is a good thing to try the parallel rings, as Captain Wild has found them beneficial in the air cooled engines. You will remember that our double rings produced a parallel ring and a very even pressure throughout, without space at the back, but I think all the trouble with eccentric rings is the want of surface to fit the sides of the grooves near the thin part of the ring. We have already experimented to find out whether there was anything in/excess of space under the rings, but as the parallel ring enables the fit in the grooves to be more satisfactory, I am inclined to think that we ought to adopt it universally. The name that comes into my mind with the manufacture of hammered rings is the Standard Ring Company of Sheffield. Please, therefore, get some experimental rings for our 4½" Aero Engine, for the Renault Engines, and for our ordinary standard car engine. R.{Sir Henry Royce} | ||