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).
Table of measurements detailing the wear on a Bentley 6 Unit crankshaft and its bearings after endurance testing.
| Identifier | ExFiles\Box 3\6\ 06-page279 | |
| Date | 16th June 1934 | |
| BENTLEY 6. UNIT — AFTER 100 HRS. ENDURANCE & 100 HRS GENERAL RUNNING CRANKSHAFT EX. PRODUCTION V.C.M ALL BEARINGS 1/4 WHT BENELL 6.3 - (NORMAL) TABLE OF MEASUREMENTS: .002" STD. CLEARANCE | | WHEN MEASURED | JOURNAL DIA. | MAIN BRG. DIA. | CLEARANCE | |---|---|---|---|---| | 1 | New | 2.7481 | 2.7503 | .0022 | | | AFTER 100 HRS END. | 2.7476 | 2.7510 | .0034 | | | WEAR | .0005 | .0007 | | | 2 | New | 2.7482 | 2.7503 | .0021 | | | AFTER 100 HRS. | 2.7479 | 2.7515 | .0036 | | | WEAR | .0008 | .0012 | | | 3 | New | 2.7481 | 2.7504 | .0023 | | | AFTER 100 HRS | 2.7478 | 2.7525 | .0047 | | | WEAR | .0003 | .0021 | | | 4 | New | 2.7480 | 2.7508 | .0028 | | | AFTER 100 HRS | 2.7470 | 2.7520 | .005 | | | WEAR | .001 | .0017 | | | 5 | New | 2.7482 | 2.7503 | .0021 | | | AFTER 100 HRS | 2.7480 | 2.7520 | .004 | | | WEAR | .0002 | .0017 | | | 6 | New | 2.7482 | 2.7504 | .0022 | | | AFTER 100 HRS | 2.7476 | 2.7517 | .0041 | | | WEAR | .0006 | .0013 | | | 7 | New | 2.7482 | 2.7504 | .0022 | | | AFTER 100 HRS | 2.7477 | 2.7510 | .0033 | | | WEAR | .0005 | .0006 | | .002" STD. CLEARANCE | CRANKPIN DIAS. | BIG-END DIAS. | CLEARANCE | |---|---|---| | 1.9983 | 2.0009 | .0026 | | 1.9983 | 2.0009 | .0026 | | | | | | 1.9984 | 2.0009 | .0025 | | 1.9980 | 2.0009 | .0029 | | .0004 | | | | 1.9985 | 2.0007 | .0022 | | 1.9978 | 2.0007 | .0029 | | .0007 | | | | 1.9985 | 2.0007 | .0022 | | 1.9979 | 2.0007 | .0028 | | .0006 | | | | 1.9990 | 2.0008 | .0018 | | 1.9982 | 2.0008 | .0026 | | .0008 | | | | 1.999 | 2.0008 | .0018 | | 1.9982 | 2.0008 | .0026 | | .0008 | | | | | | | | | | | | | | | | ||