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).
Suggested specification for an engine, its lubrication, and ignition system.
| Identifier | ExFiles\Box 139\3\ scan0221 | |
| Date | 20th April 1939 | |
| SECRET. W/S. To Bkl. from Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}4/MH.{M. Huckerby}20.4.39. B.V. SUGGESTED SPECIFICATION. ENGINE. Six cylinders cast in one block, 3½ in. (89 M.M.) bore by 4½ in. (114 M.M.) stroke. 4257 cc., 29.4. H.P. RAC Rating, Tax £22.10.0d. Detachable cylinder head with overhead valves push rod operated and totally enclosed rockers. The exhaust valves stellite faces. Pistons of patented design and alloy, with power dome raised crown. The engine and gearbox unit is flexibly mounted on rubber, there being one point of support high up at the front of the engine, and one under the gearbox, in addition, a rubber block is mounted on either side of the gearbox so arranged as to limit the engine movement and to provide damping. ENGINE LUBRICATION. Pressure fed from a gear type oil pump to all crankshaft bearings, big ends and gudgeon pins, and at reduced pressure to valve rockers, push rods and tappets, and a renewable bye-pass filter is provided in order to remove from the oil all minute particles of foreign matter which readily pass through the mesh of an ordinary gauze so that the oil is being continually cleaned during the whole time the engine is running. IGNITION SYSTEM. Battery, coil and distributor with automatic control of the timing. | ||