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).
Observations on piston ring performance, oil consumption, and piston design.
| Identifier | ExFiles\Box 173\2\ img081 | |
| Date | 25th January 1934 guessed | |
| F1 bore, particulars of which I have. You can get a ring which laps in perfectly and yet is no good for oil consumption. I think they require a heavier ring pressure than we do because their short piston does not stay square in the bore. (3) They find that they cannot use a bedding wider than "5" on the split side of the skirt, otherwise they get a tendency to scuff up. (4) They are inclining towards funneled rings, because they have measured that rings rotate very regularly at high speeds even in a worn bore. The top ring may have to be free to avoid gumming up. (5) For zero weather they find the hole in the connecting rod supplying oil to be of the greatest value. They have to use a slightly higher unit pressure on their scraper ring when they adopt this but then their oil consumption is not increased appreciably at top speed. With the hole in the rod the oil gets there instantly they say provided the oil pump will pump. (6) They are strongly in favour of the | ||