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).
List of proposed modifications and their development status for various chassis models.
| Identifier | ExFiles\Box 30\2\ Scan342 | |
| Date | 9th December 1933 | |
| - 2 - Modification. P.II. 20/25. (2) Automatic control of shock dampers with over-riding control. Instructions issued. Instructions issued (3) New carburetter. Larger semi expand-ing RR.carburetter with worm drive slow running adjustment. Instructions issued. RR. S.U.type with worm drive slow running adjustment. Instructions issued (4) Flexible mounting for silencer as Bentley. The question of eliminating rattles and crackles on prod-uction is being investigated. Design required. Design required. (5) Synchro mesh second speed. Design in hand. ------- (6) Bonnet Stops. Instructions issued. Not asked for yet on this chassis. (7) Textolite Camshaft Gear for balancing cam. Design required. Design required. (8) Balancing Cam. Instructions issued for Vulture. See what is necessary for adaption to standard P.II. Instructions issued (9) Balance Weight Studs with collars. Design required. As Bentley. (10) Roller Tappets. Instructions issued. 20/25 has always had roller tappets. Not required. (11) Hydraulic tappet gear. Modifications to Vulture design required. Hope to use Vulture cylinder head pattern with stud bosses enlarged Not required. | ||