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).
Laboratory report on oil absorption and thermal expansion tests for 'D' type rubber sealing rings for Ph.lll Cylinder Liners.
| Identifier | ExFiles\Box 93\4\ scan0031 | |
| Date | 15th January 1936 | |
| Redes Swall 319 To E.{Mr Elliott - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} c. Mx.{John H Maddocks - Chief Proving Officer} HL5/AG.15.1.36. Laboratory. Re: Sealing Rings for Ph.lll Cylinder Liners. We have carried out tests on the oil absorption of the "D" type rubber rings at 100°C., The rubber ring in the rig made by Mr. Maddox did not absorb any oil during the 30 hours test, the only effect was that it was permanently moulded to the shape of the groove of liner. A similar rubber ring was immersed in oil at 100°C. for 30 hours. This increased in volume from 7.95 ccs. to 8.68 ccs. These two experiments showed that under engine conditions absorption is very much smaller than under total immersion conditions and would indicate that the "D" type ring is quite satisfactory for production. We have also measured the coefficient of cubical expansion in this type of rubber ring, we find it to be 0.00022 per °C, we should therefore expect no trouble from thermal expansion of the rubber. HL. HE | ||