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 results on bevelled piston scraper rings.
| Identifier | ExFiles\Box 77\3\ scan0271 | |
| Date | 1st February 1923 | |
| X4224 To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Ds. c. to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}4/LG1.2.23. PISTONS - SCRAPER RINGS. We have carried out tests as you suggested and have proved that the advantage in the bevel ring is due to the increase in pressure per unit area. We get the same results as regards reducing the oiling whether the ring is the other way up or whether we chamfer each edge of the ring. We think there may be a slight advantage in the way we use it at present in the gas-tightness of the piston because we avoid any annulus on the pressure side of the rings. Hs.{Lord Ernest Hives - Chair} | ||