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).
Comparing cylinder bore wear figures for 3.5 and 4.25 litre Bentley engines.
| Identifier | ExFiles\Box 131\2\ scan0291 | |
| Date | 25th October 1938 | |
| 1113. To By... from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} c. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}39/N.25.10.38. Bentley - Cylinder Bore Figures. At the request of Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}9/JH.10.10.38, for a comparison wear figure of 3½ and 4¼ litre Bentleys, I enclose herewith a chart and drawing taken of cars nearest to the figures of 20,000 miles and 30,000 miles. The figure of .300" at the crown is the position of maximum wear, the other two figures are the routine position of measurement. In the plan of the cylinder bore shewn the line "xx" is the average position, which has shewn the maximum wear. GWH.{George W. Hancock - Head Chateauroux} | ||