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 experimental raised crown pistons to a Wraith chassis to increase the compression.
| Identifier | ExFiles\Box 146\5\ scan0198 | |
| Date | 20th July 1939 | |
| To Rolls-Royce Ltd. Derby........... Rm.{William Robotham - Chief Engineer} Copy to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} file 1245 Levallois Sr/VA3/ET.20.7.39 Re: FITTING RAISED CROWN (Experimental) PISTONS 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 the above type of pistons to the undermentioned chassis: Chassis N°: WXA. 48 Owner: Princesse de FAUCIGNY LUCINGE Engine N°: P.9WG{Mr Gill - Financial Director} Type of piston fitted: P.46I (Split skirt) Compression raised by half a ratio) Mileage when fitted: 3374 Kms. Date when fitted: 19.7.39 Sr/VA. | ||