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).
Fitting raised crown pistons to a Wraith chassis to increase compression.
| Identifier | ExFiles\Box 146\5\ scan0337 | |
| Date | 26th April 1940 | |
| File 1245 To "Rm{William Robotham - Chief Engineer}" Derby c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Levallois Sr/VA2/MLG.26.4.40 Re- Fitting raised crown psitons to Wraith Chassis to increase the Compression (Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}IO/JH.26.6.39) We have fitted a set of raised crown pistons to the following chassis. Chassis N°: WRB-20 Owner: Poniatowski Engine N°: G 9 W S Type of pistons fitted: EB-4740 Compression raised by one ratio. Mileage when fitted: 9.855 kms Date when fitted: 4.4.40 "VA" VA | ||