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).
The condition and performance of various engine components including cylinders, pistons, and manifolds.
| Identifier | ExFiles\Box 5a\2\ 02-page341 | |
| Date | 18th December 1930 guessed | |
| -2- CYLINDERS to LOP. E.55334-Scheme 1475 - LcC 2607. E.56057 Pedestal Stud } To suit Ignition E.56058 Bracket } Timing to E.56059 Pivot } Scheme 1475. E.56094 Dist. Piece - To bring Fan Drive further out to suit Dynamo Drive - LcC 2607. E.56063 Valve Guides - To suit Gland Med. Scheme 1253 There is no sign of water leaks from the cylinders. The joint gasket has not deteriorated in any way. The cylinder bores appear to be free from any sign of failure. The lubrication has been ample and even with no overoiling. With a 15.mins. slow running test taken after each day's run the exhaust has been free from smoke. PISTONS to LOP E.53804. E.55376 PISTONS. E.55361/2 PISTON RINGS. At this mileage, there has been no piston knocks audible, hot or cold. Compressions are even. A fair amount of carbon has been deposited on the piston heads. INLET PIPE to LOP E.54373. CARBURETTER to LOP E.54492 - LcC 2728. The Inlet Pipe does not show any fracture at this mileage. The C & A joint washers are in a good condition and have kept sound joints. The carburetter air valve was in the first place too good a fit, which caused it to bind and occasionally stick, this was eased and has since operated satisfactory. The carburetter has functioned satisfactory and is fairly quiet. The petrol consumption which is on the high side cannot be reduced with the low water temperature without losing acceleration and power. STARTING CARBURETTER HAVING FIXED MAXIMUM RESTRICTION. The engine has started up readily from cold. The maximum restriction is not correct, the mixture being too strong. Further tests will have to be made to remedy this feature. EXHAUST MANIFOLD. The exhaust manifold at this mileage shows no fracture and is still O.K. The C & A port washers are not as yet good enough although a great improvement on the previous ones. These had not blown out or caused an exhaust blow, but when dismantled the inner portion had been burnt away and the face had started to crumple up. The port holes of these washers are smaller in diameter than the cylinder head ports, consequently the exhaust gasses burn the copper edge away. The failure would no doubt be overcome by increasing the size of the port holes. The joint of the manifold and exhaust down pipe has given no trouble and has been free from any exhaust blows. | ||