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).
Test results on piston ring groove clearance and carbon build-up.
| Identifier | ExFiles\Box 16\1\ Scan182 | |
| Date | 19th November 1926 guessed | |
| Contd :- -2- Our tests indicate that there is less tendency to 'gum up' with large groove clearance than with small. A probable explanation is that liberal clearance allows sufficient movement of the ring to prevent building up a film of carbon. We are now making tests to shew how the gumming tendency is influenced by weak and stiff piston rings. The results should shew us if an advantage could be expected from stiffer rings. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey. | ||