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).
Specification sheet comparing different types of piston rings.
| Identifier | ExFiles\Box 144\3\ scan0059 | |
| Date | 23th June 1936 guessed | |
| -2- Compression Rings. (E.60820). Tangential load = 1.954 lbs. Dial of ring = 3.500 Width = .0937 Radial thickness = .120 Cylinder wall pressure. = 11.9 lbs./sq.in. Ratio Cylinder dia./Radial thickness = 29.2 :1 Chevrolet Rings. Scraper Ring. Tangential load = 4.1405 lbs. Dia. of ring = 3.312 Width (total) = .186 Radial thickness = .142 Width of hands and slots = .1125 Width of slots. = .060 Cylinder wall pressure = 47.6 lbs./sq.in. Ratio: Cylinder dia./Radial thickness = 23.3 : 1 | ||