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).
Test report detailing cylinder bore wear measurements for various engine units.
| Identifier | ExFiles\Box 159\5\ scan0204 | |
| Date | 23th June 1941 | |
| -cont'd- - 3 - Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}6/SW.23.6.41. Cylinder Bore Wear (cont) 1-B-50. Unit B.60 No.1 Passed for test 23.4.40. Bores 1 & 3 Brivadium Bores 4,5,6 Hi-chrome Bore No. 2 New short insert fitted B.106 Phos-chrome. 3-B-50. Unit B.60 No.4 Record taken 2.10.40. Mileage 22,500 + 29 hrs. 15 mins. Test Bed. Bores 1 & 2 Standard - Max Wear .005" to .006" Bores 3 & 4 Hi-chrome " " .0001" " .0002" Inserts Bores 5 & 6 Brivadium " " .001" " .002" 4-B-50. Unit B.80 No.1 Record taken 17.1.41. Cyl. block as Crankcase I/C Mileage 12,784. Bores - Standard - Max Wear - .004" to .007" 30-G-Vll. Unit B.80 No.5 Record taken - 9.4.41. Mileage 66,548. Bores 1 & 2 Standard - Max Wear .010" to .012" 3 & 4 Chrome Inserts " " .001" to .002" 5 & 6 Nickel Chrome Inserts. " " .008" to .010" 7 & 8 Standard " " .008" to .010" 1-R-1. Unit W.R. No.3 Record taken - 4.5.41. Mileage 11,998 Material - Nickel - Chrome - Molybden Solid Bores - 3.250 dia. Max Wear - .004" to .006" 25-G-Vll. Unit W.111 - Mileage 13,972. Bores Chrome Plated - Max Wear .0025" to .004" ----------------- Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} [Signature] | ||