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 the dimensions and wear of connecting rod bearings and crankpins for engine unit C17 after mileage tests.
| Identifier | ExFiles\Box 101\2\ scan0256 | |
| Date | 3rd March 1937 | |
| ENGINE UNIT C17 CHASSIS 22GJ 28,923 MILES IN FRANCE. TEST 1175 MILES IN ENGLAND. DATE - 3-3-37 ROLLS-ROYCE, LTD. PRINT ROOM, 3 MAR 1937 DERBY. CRANKSHAFT EB 2687 MATL. VCM TEST No. CONN. ROD BEARINGS EB 2810 MATL. HALL'S METAL OIL HOLE CONN. ROD BRGS. & CRANKPIN DIMENSIONS CONDITION OF BEARINGS WAS EXCEPTIONALLY GOOD TABLE DATA: CONN. ROD BEARINGS: No. | DIA BEFORE TEST | DIA AFTER TEST A | DIA AFTER TEST B | OVALITY | MAX WEAR 1 | 2.0009 | 2.001 | 1.9995 | .0015 | .001 2 | 2.0009 | 2.001 | 2.0003 | .0007 | .0001 3 | 2.0009 | 2.002 | 2.0005 | .0015 | .0011 4 | 2.0009 | 2.0015 | 1.997 | .0045 | .0036 5 | 2.0009 | 2.001 | 1.998 | .003 | .0001 6 | 2.0009 | 2.0015 | 1.999 | .0025 | .0006 CRANKPINS: No. | DIA BEFORE TEST | DIA AFTER TEST A | DIA AFTER TEST B | OVALITY | MAX WEAR 1 | 1.999 | 1.9988 | 1.9987 | .0001 | .0003 2 | 1.9991 | 1.9988 | 1.9987 | .0001 | .0004 3 | 1.999 | 1.9988 | 1.9988 | NIL | .0002 4 | 1.999 | 1.9988 | 1.9987 | .0001 | .0003 5 | 1.9991 | 1.9988 | 1.9988 | NIL | .0003 6 | 1.999 | 1.9985 | 1.9984 | .0001 | .0006 MAX CLEARANCE BETWEEN CRANKPINS & BEARINGS: No. | BEFORE | AFTER 1 | .0019 | .0023 2 | .0018 | .0028 3 | .0019 | .0032 4 | .0019 | .0028 5 | .0018 | .0022 6 | .0019 | .0031 | ||