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).
Detailed analysis of wear on big end bearings and crankpins after extended mileage.
| Identifier | ExFiles\Box 83\2\ scan0044 | |
| Date | 14th May 1937 | |
| B.4 UNIT. BIG END BEARINGS THE BEARINGS HAVE COMPLETED 12,550 MILES THE CRANKSHAFT HAS DONE 16,000 MILES CRANKSHAFT E61223 V.C.M. 5456 W626 ONE HOLE IN CRANKPINS. BEARINGS 1, 2 & 3 IN AC.5.S. 4, 5 & 6 IN AC.6.S. TABLE DATA: BEARINGS: No, DIA. BEFORE, DIA AFTER AA{D. Abbot-Anderson}, DIA AFTER BB, OVALITY, MAX. WEAR 1, " , 2.0011, 2.0027, .0045, .0016 2, " , 2.0029, 1.9987, .0042, .0018 3, " , 2.0021, 1.9998, .0023, .001 4, " , 2.0023, 1.9993, .003, .0012 5, " , 2.0030, 1.9991, .0039, .0019 6, " , 2.0029, 1.9983, .0046, .0018 CRANKPINS: No, DIA. BEFORE, DIA. AFTER A, DIA. AFTER B, OVALITY, MAX. WEAR 1, 1.999, 1.9987, 1.9989, .0002, .0003 2, ", 1.9988, 1.9989, .0001, .0002 3, ", 1.9988, 1.9989, .0001, .0002 4, ", 1.9986, 1.9988, .0002, .0004 5, ", 1.9988, 1.9989, .0001, .0002 6, ", 1.9988, 1.9987, .0001, .0003 MAXIMUM CLEARANCE: No, BEFORE, AFTER 1, .0021, .004 2, ", .0041 3, ", .0033 4, ", .0037 5, ", .0042 6, ", .0042 BEARINGS & CRANKPINS IN EXCELLENT CONDITION. THERE WAS NOTHING TO CHOOSE BETWEEN THE AC.5.S & AC.6.S BRGS. | ||