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).
Report page detailing the testing procedures and results for various bearing alloys.
| Identifier | ExFiles\Box 115\5\ scan0220 | |
| Date | 6th December 1938 guessed | |
| 9. trolled proportions of tin, antimony, nickel, manganese and silicon. All three bearings were "run-in" for two hours at 1,000 1,300 and 1,700 r.p.m. at 80°C ± 5, the speed then being reduced to 1,000 r.p.m. and the test proper started. The speed and load in lb.per.sq.inch. were then increased alternately at 15-minute intervals by 200 r.p.m. and 200 lbs. per sq.inch respectively on the Thurston bearing testing machine, amperage readings giving the relative bearing properties of the three materials. The curves show that at all speeds and pressures up to 2,800 r.p.m. and 2,400 lb. per sq. inch the aluminium base alloy has a lower friction co-efficient than the other two materials tested. (Here insert chart of test) Tests on these new alloys have also been carried out by independent engine manufacturers with highly satisfactory results. One manufacturer of heavy transport vehicles, now using Hiduminium RR.56 having changed over from Lead-Bronze reports that the following test was carried out in which three Aluminium tin material big end bearings were fitted in a 6 cylinder engine, the remaining three bearings being of specially treated Hiduminium RR.56. In this test | ||