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).
Requesting sets of raised crown pistons for 4 1/4-litre Bentleys to improve performance and gain experience.
| Identifier | ExFiles\Box 87\2\ scan0257 | |
| Date | 31th March 1939 | |
| 236 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}4/R.31.3.39. We should like to get a few sets of raised crown pistons for 4 1/4-litre Bentleys which can be fitted when people want improved performance. Customers will pay for the pistons, and, of course, in using them we will get some advanced experience on their behaviour. A customer who has asked for this pistons is - R.{Sir Henry Royce} Summers, Chassis No. B.58.G.A. Will you please make sure that one set of pistons ordered will suit his engine. His cylinder block has been re-bored, so you will have to get the over-size figures from the Repair Dept. Rm.{William Robotham - Chief Engineer} | ||