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 performance of special Nickel Chrome Molybdenum Alloy cylinder blocks fitted to owner's cars.
| Identifier | ExFiles\Box 114\3\ scan0008 | |
| Date | 21th February 1939 | |
| File Copy To Rm.{William Robotham - Chief Engineer}... from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}1/N.21.2.39. SPECIAL FEATURES FITTED TO OWNERS CARS. Cylinder Blocks produced in Nickel Chrome Molybdenum Alloy. (1) 1 No.W.1. fitted to B.44.LS. at mileage of 13,145 - 16.1.39 1 No.W.2. " " B.86.LS. " " " 11,974 - 15.2.39 (These were held up owing to not having any standard pistons.) (2) Cylinder block worn at low mileage and considered to be soft was rebored to .015 oversize No.W2BMEB 2929 was fitted to B.103.GP - 24.8.38 at a mileage of 18,449. Has since run 3000 miles when last in 21.9.38. No records taken. (3) Chassis B.144.HK.{Col. T. Harker - Sales} which the above cylinder block was taken off was fitted with a standard block H26/Z4BJ. at a milage of 11,769 on the 11.3.38. It has not since been into the Depot. (4) Special block ground not honed ( .015 oversize) was fitted to Ferguson's car B.86.GA. - 7.12.36 mileage 8,514. On the 11.12.37 after another 16,136 miles had been run, the bores were measured as follows: Nominal. Taper. Oval. M.{Mr Moon / Mr Moore} C. T. 1. 3.510 .005 .002 1 1 5 2. .005 .001 N 1½ 2 3. .0045 .0005 N 1 4½ 4. .005 .0015 N 1 5 5. .004 .001 N 1 4 6. .004 .001 N N 4 Pistons EB.2844 No wear. This car has had no attention paid to the engine since the above measurements were taken. | ||