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).
The fitting of experimental raised crown pistons to Wraith chassis to increase compression.
| Identifier | ExFiles\Box 146\5\ scan0187 | |
| Date | 28th June 1939 | |
| 1245 To Rolls-Royce Ltd. Derby......... Rm.{William Robotham - Chief Engineer} Copy to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Levallois Sr/VAI/ET.28.6.39 Re: FITTING RAISED CROWN (EXPERIMENTAL) PISTONS TO WRAITH CHASSIS TO INCREASE THE COMPRESSION --------------------------------------------- With reference to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}IO/JH.26.6.39, we have received the two sets of experimental pistons, for which we thank you. We have, up to date, fitted special pistons to the undermentioned chassis: CHASSIS N° OWNER ENGINE N° TYPE OF PISTON FITTED MILEAGE WHEN FITTED DATE WHEN FITTED WXA. 16 Mr. LANG T8WK P.414 Sent in case N° E.17702. Compression raised presumably by half a ratio.? 466 Kms. 7.2.39 WRB. 46 Mr. LA{L. A. Archer} MONTAGNE B2WP P.452 (Aerolite) Compression raised by half a ratio. 2490 Kms. 27.6.39 WXA. 14 Mr. POBEREJSKY T6WK P.45I (Aerolite) Compression raised by one ratio. 8163 Kms. 28.6.39 With reference to the 6 P.46I (split skirt) pistons which we now possess and which we have entered into our stock, we will let you have similar information as given above, as soon as we fit them to a car. Sr/VA. | ||