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.
| Identifier | ExFiles\Box 124\1\ scan0021 | |
| Date | 23th February 1939 | |
| UNIT No BENT. 80 No1 PASSED TO TEST :- 9-12-38 COMPLETED TEST :- 23-2-39 CONN: ROD BEARINGS & CRANKPIN DIMENSIONS CONN: ROD BEARINGS :- EW.1743 MATL :- AC.9. CRANKSHAFT :- EB.4104 (EX.31604). MATL :- 4461-1-C.A.B. TEST PIECE No :- - RUNNING TIME :- 68 HRS. MILEAGE :- (18 HRS. 50 MINS F.T.) TABLE DATA: No | POSITION | BEARINGS | | | CRANKPIN | | | CLEARANCE | | | | BEFORE | AFTER | WEAR | BEFORE | AFTER | WEAR | BEFORE | AFTER | DIFF. 7. | A-A | 2.00125 | 2.0015 | .00025 | 1.9990 | 1.9985 | .0005 | .00225 | .0030 | .00075 | B-B | " | " | " | " | " | " | " | " | " | OVALITY | NIL. | NIL. | - | NIL. | NIL. | " | " | " | " 8. | A-A | 2.00125 | 2.0015 | .00025 | 1.9990 | 1.9985 | .0005 | .00225 | .0030 | .00075 | B-B | " | " | " | " | " | " | " | " | " | OVALITY | NIL. | NIL. | " | NIL. | NIL. | " | " | " | " 3 | A-A | B-B | OVALITY 4 | A-A | B-B | OVALITY 5 | A-A | B-B | OVALITY 6 | A-A | B-B | OVALITY GAUGE SIZE :- | ||