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 cylinder bore dimensions and wear for a Bentley 80 No.1 unit.
| Identifier | ExFiles\Box 124\1\ scan0022 | |
| Date | 23th February 1939 | |
| PASSED TO TEST:- 9-12-38 COMPLETED TEST:- 23-2-39 UNIT Nọ BENTLEY 80.No1. CYLINDER BORE DIMENSIONS CYLINDER BLOCK EB.3950 MATL I/C RUNNING TIME:- 68 HRS. (18 HRS. 50MINS FT) MILEAGE:- MEASUREMENTS AT CROWN REPRESENT MAX. WEAR AT TOP OF STROKE Diagram Labels: A, B, .350, .500 Diagram Sections: CROWN, CENTRE, MOUTH Table Data: BORE Nọ | POSITION | CROWN (BEFORE, AFTER, WEAR) | CENTRE (BEFORE, AFTER, WEAR) | MOUTH (BEFORE, AFTER, WEAR) 1 | A-A | -, 3.5015, .0006 | 3.5000, 3.4998, .0002 | 3.5005, 3.5002, .0003 | B-B | -, 3.5008, - | | | OVALITY | -, -, .0005 | | 2 | A-A | -, 3.5008, .0002 | 3.4998, 3.5005, .0007 | 3.5004, 3.5005, .0001 | B-B | -, 3.5006, - | | | OVALITY | -, -, .0002 | | 3 | A-A | -, 3.5012, .0004 | 3.4998, 3.5002, .0004 | 3.5008, 3.5006, .0002 | B-B | -, 3.5008, - | | | OVALITY | -, -, .0004 | | 4 | A-A | -, 3.5012, .0002 | 3.4998, 3.5002, .0004 | 3.5008, 3.5005, .0003 | B-B | -, 3.5014, - | | | OVALITY | -, -, .0002 | | 5 | A-A | -, 3.5010, .0002 | 3.4996, 3.5006, .0010 | 3.5010, 3.5012, -.0002 | B-B | -, 3.5008, - | | | OVALITY | -, -, .0002 | | 6 | A-A | -, 3.5010, .0002 | 3.4997, 3.5008, .0011 | 3.5010, 3.5008, .0002 | B-B | -, 3.5012, - | | | OVALITY | -, -, .0002 | | | ||