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).
Dimensional report for Hall's Metal Connecting Rod Bearings following a road test.
| Identifier | ExFiles\Box 90\5\ scan0136 | |
| Date | 30th June 1936 | |
| UNIT N°. "B".20. HALL'S METAL CONNECTING ROD BEARINGS. CRANKSHAFT: E.B.2687 - Y.C.M. - FITTED PRIOR TO 17,000 MILES ROAD TEST. CONN-ROD BEARINGS: E.B.2810 - "HALL'S METAL" - SOLID TYPE. FITTED AFTER COMPLETION OF 11,000 MILES OF 17,000 MILES TEST. INITIAL SIZE OF CRANKPINS = 1.999" DIA. INITIAL SIZE OF BEARINGS = 2.0008" BORE CLEARANCE = .0018" DIMENSIONS TAKEN AFTER 17,000 MILES ROAD TEST. (BEARINGS RUN 6000 MILES) TABLE DATA: | BRG N° | CRANKPIN DIA. | CONN-ROD BEARING BORE AA.{D. Abbot-Anderson} | CONN-ROD BEARING BORE BB. | OVALITY | AVERAGE CLEARANCE | |---|---|---|---|---|---| | 1. | 1.9988 | 2.0002 | 2.0025 | .0023 | .00255 | | 2. | CONNECTING ROD FAILED. | | | | | | 3. | 1.9988 | 2.0005 | 2.0018 | .0013 | .00235 | | 4. | 1.9988 | 2.0002 | 2.0018 | .0016 | .0022 | | 5. | 1.9985 | 2.000 | 2.0023 | .0023 | .00265 | | 6. | 1.9988 | 1.9995 | 2.0018 | .0023 | .00185 | DIAGRAM LABELS: A, B | ||