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).
Cylinder bore wear for a Bentley 3 1/2-Litre, Chassis No. B.3.CW, over a period of 21,460 miles.
| Identifier | ExFiles\Box 130\2\ scan0372 | |
| Date | 22th December 1936 | |
| 1113 K/W. Rm.{William Robotham - Chief Engineer} GWH{George W. Hancock - Head Chateauroux}/DPB/22.12.36. BENTLEY CYLINDER BORE WEAR. Becker. Chassis No.B.3.CW. 3 1/2-Litre. We give below the comparative wear of cylinder bores during 21,400 miles and Aerolite Pistons with extra oil:- 7.2.36. Aerolite Pistons, new cylinder block. Standard bore diameter. Mileage 12,714. 8.9.36. Halls big ends fitted. Max.cylinder wear .008" " " ovality .003" Mileage 21,187 = 14,473 miles. 17.12.36. Complaint heavy oil consumption and piston slap. Max.cylinder wear .010" " " ovality .004" = 6,987 miles. Oil consumption 400.m.p.g. Mileage 34,174. Total miles on pistons and cylinder bores 21,460. Flat out driver all gear. GWH.{George W. Hancock - Head Chateauroux} | ||