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).
Modifications to convert a Wraith engine to a 3¼' bore for a Rationalised Programme.
| Identifier | ExFiles\Box 108\2\ scan0226 | |
| Date | 18th March 1939 | |
| 600. By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Rm{William Robotham - Chief Engineer}3/R.18.3.39. 3¼" Bore Engine for Rationalised Programme. Will you please arrange for Da{Bernard Day - Chassis Design}/McS. to look into the modifications necessary to convert the Wraith engine into a 3¼" bore. The piston dimensions of the 3½-litre Bentley should be followed exactly. We should like, if possible, to use the existing head and get the increased ratio by a raised crown piston. The general objective is to make the minimum number of modifications to the existing patterns. Rm.{William Robotham - Chief Engineer} | ||