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).
Observation comparing the carburation performance of older cars with cast iron pistons against the 49GB model.
| Identifier | ExFiles\Box 38\2\ Scan020 | |
| Date | 26th April 1917 guessed | |
| Extract from EH7/LG4.2.191 X.3456.- Any of the old type cars which I have tried lately which have had cast iron pistons and smaller radiators have been very much better from the carburation point of view than 49GB is, although they have been run on similar petrol. EH. | ||