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 required modifications and their development status for the Phantom II and 20/25 models.
| Identifier | ExFiles\Box 30\2\ Scan343 | |
| Date | 9th December 1933 | |
| - 3 - E.4/HP.9.12.33. Modification. P.II. 20/25. -------------------------------------------------------------------------------------------------------------------------- (11) continued. where required and ------- using standard valves. (12) Cam Forms. Instructions required ------- for modified cam forms with short toes. Produce ground cam form from machined model nine times full scale. (13) Eccentrically Design required. Design required. mounted dynamo pinion. (14) Improved crankcase Instructions issued. Instructions issued. No breather connecting air silencer with valve gear cover. (15) Modification to This applies to P.2. ------- prevent fan belt only. fouling. Instructions required. (16) Harrison matrix Instructions required. ------- for radiator. (17) Helical gear oil Design required. Design required. pump. (18) Voltage controlled Instructions issued Instructions to be dynamo. for gold standard completed. scheme. (19) Fully floating Instructions issued. Design required. brake servo. (20) Roller Bearing Design required. As Bentley. Propeller Shaft. (21) Wider front brake Design issued. ------- shoes in sheet metal welded construction. (22) Steering with Designs issued. ------- .940 lead. | ||