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).
Valve lubrication issues on engine 12-G-4 causing unreliability at slow speeds.
| Identifier | ExFiles\Box 105\2\ scan0189 | |
| Date | 16th October 1928 | |
| Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} c. to BJ. Wor.{Arthur Wormald - General Works Manager} PN.{Mr Northey} CWB. X5040 R3/M16.10.28. VALVES. X. 5060 X. 5040 X. 5770 Our experience with 12-G-4 says that the valves are not getting enough oil, especially the inlets, because they have been sticking, spoiling the slow running, and making the engine unreliable at slower speeds; but not affecting the high speeds. It is possible that this fault caused you to blame the pistons because this engine has always been slightly unsatisfactory. R.{Sir Henry Royce} | ||