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).
Page 2 of a document detailing specifications for the Engine, Electrical Equipment, Clutch, and Gearbox.
| Identifier | ExFiles\Box 139\3\ scan0168 | |
| Date | 3rd June 1938 | |
| -2- Engine Cont'd.{John DeLooze - Company Secretary} Lubrication is by a gear pump which delivers oil to the crankshaft and connecting rods at 25 to 30 lbs. pressure. This pressure is controlled by a dual spring loaded relief valve, one valve supplying oil to the high pressure system, the other at a lower pressure to the rocker mechanism. The cooling system incorporates a powerful centrifugal water pump, a fan of Rolls-Royce design to attain silence with efficiency, and thermostatically operated radiator shutters. Special attention has been paid in the development of the 25/30 Wraith engine to secure adequate water passages in both the cylinder head and block. A feature, the result of long experimental work, is the latest Rolls-Royce engine mounting, whereby the engine is suspended at the front by means of a raised arch, which in conjunction with the rubber mounting at the rear, effectively prevents engine tremors being transmitted to the passengers. Electrical Equipment. In order to obtain a standard of construction consistent with the other parts of the chassis, Rolls-Royce Ltd. design and make throughout at their own works many electrical components fitted to their cars, this includes the 12 volt dynamo, of the constant voltage type, the charging output of which is automatically controlled according to the state of the battery. Each Rolls-Royce starter motor is subjected to rigorous testing on the bench before being fitted to the engine in order to ensure that it is in every way adequate for the work for which it is intended. The 60 ampere hour battery is specially constructed for Rolls-Royce Ltd. to their specification. Clutch This is of the single dry plate type. The perfection of operation which has been obtained will be instantly observed by anyone taking a trial run in one of these cars. Gearbox Long life and silence, two features so inalienably connected with the name of Rolls-Royce are built into the latest four speed gearbox, in which is included the simplified gear change afforded by the use of synchronising cones, which are positive in operation. Such is the ease of gear changing with this design, that any further departure from the | ||