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).
Specifications and ordering requirements for various types of piston rings, including scraper and compression rings.
| Identifier | ExFiles\Box 87\2\ scan0223 | |
| Date | 13th May 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Mths.{Reg Matthews}5/JN.13.5.36. We should like you to confirm these figures but we believe they are approximately correct; we have checked over the standard scraper rings, and using these values we get a wall pressure of 18.65 lbs/sq.in. which of course conforms to the figures we get by actually loading the rings. We should like you however, to produce the rings from a material having an EN value high enough to give us 18 - 19 lbs/sq.in. wall pressure. You will of course note that the rings to the drawings are for use with stops. We should also like in addition to the rings already asked for 20 rings similar to E.61115 but for use without stop 40 " " E.61116 " " " " All the above rings should have butt joints and ground finish on periphery. With regard to the high pressure rings you have already supplied us with to the Chevrolet proportions we should like you to send us along the following spares since we have had one or two failures. 14 Scraper rings. (Centrifugally cast) 14 Stepped compression rings. " " 14 Plain compression rings. " " 14 Scraper rings. (Individually cast) 14 Stepped compression rings. " " 14 Plain compression rings. " " Yours faithfully, FOR ROLLS-ROYCE LTD. | ||