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).
Proposal to trial rectangular piston rings on the 20HP engine to address overoiling issues.
| Identifier | ExFiles\Box 105\2\ scan0169 | |
| Date | 27th February 1928 | |
| By c Hs{Lord Ernest Hives - Chair} X5040 Mx{John H Maddocks - Chief Proving Officer}4/T27.2.28 re 20HP Pistons With the strutted cylinders, we have very little trouble with overoiling, and we should like, if you agree, to try the rectangular type of piston ring again. Although it was not successful when it was tried recently on the Phantom, the 20HP is not so prone to overoil, and we think the rectangular rings would certainly be worth a trial on the 20HP. If you agree, we think the best scheme would be for say, a dozen engines to be built up in batches of 3 with about 3 weeks interval between the batches. this would prevent serious delay, should it be necessary to change the rings back to the L. type when on test. Mx{John H Maddocks - Chief Proving Officer} [Stamp] RECEIVED | ||