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).
Weight specifications for the PH.III 12 cylinder engine and its components.
| Identifier | ExFiles\Box 83\3\ scan0084 | |
| Date | 23th September 1938 guessed | |
| PH.III 12 CYL. 3¼ x 4½. 7300 cc. Engine, as in photograph, less flywheel, clutch, starter motor and dynamo 693 lbs. Dynamo (200 watt).. 31 lbs. } Starter Motor...... 31 lbs. } 68 lbs. Drive & Straps..... 6 lbs. } Flywheel and Clutch 60 lbs. (Not standard) 821 lbs. Peak B.H.P. 232 at 4000 R.P.M. | ||