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).
Piston performance, carbon deposits from different lubricating oils, and potential remedies.
| Identifier | ExFiles\Box 35\2\ scan 194 | |
| Date | 20th January 1920 | |
| Contd. -2- R9/G20.1.20. According to the appearance of the piston, the oil plunger seems to be keeping the piston well on the power side, while the other side above the rings gets a carbon deposit. On severe heating on hard running the piston expands and jams, due to the carbon having taken up the clearance. I think it would be as well to try a pistone ring higher up, and I should also like to know whether, in the case of the aluminium, the carbon deposit is more adhesive, and also a carbon deposit of different nature is deposited from different lubricating oils. For instance, one might imagine that the carbon from castrol might be quite different from pure mineral lubricating oil. Certainly there seems to be a good deal to learn from the case. R.{Sir Henry Royce} | ||