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).
Information for fitting an E.N.V. gearbox on a 20/25 car.
| Identifier | ExFiles\Box 136\4\ scan0070 | |
| Date | 17th November 1933 | |
| GARY x2061 23 To BY.{R.W. Bailey - Chief Engineer} from HDY.{William Hardy} HDY.{William Hardy}2/HP.17.11.33. c. Mr. E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} De. HHG. E.N.V. Gearbox on 20/25. We send the remaining information for the fitting of the E.N.V. gearbox in a 20/25 car, as shown by N. Sch's 3834, 46,47, and 68 herewith. N. Sch. 3834 shows the clutch shaft. Existing fabric joints and spider forgings are used. The flywheel is an earlier type than the present standard. The clutch casing is standard and a standard gearbox front end plate is used but turned round and with one extra stud fitted. An existing gearbox rear cross member is used to support the rear end of the engine. N. Sch. 3846 shows the gearbox suspension. The front end is supported on a piece of steel channel of standard section secured to the frame by steel brackets. The tie bars and the forward struts are to be removed to give room for the gearbox support. Rubber already moulded for the arms should be obtainable. Messrs. E.N.V. will no doubt advise. The lower pad may not be as we show however. No provision is made to relieve the rubber suspension from the propeller shaft end thrust. The rear suspension is rubber mounted and the same rubber moulding is used as for J.3. with the separate box. It will be noted that the extension shaft is slightly longer than on N. Sch. 3830. This drawing shows how the existing clutch pedal is adapted to operate the brake band spring on the gearbox. N. Sch. 3847 shows the method of mounting the E.N.V. control unit on the steering column. N. Sch. 3868 is a layout of the parts of the car involved. The propeller shaft is considerably shortened. We think there is a sufficient margin of movement in the existing universal joints. | ||