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 valve dimensions and pocketting for a Bentley 80 No.1 unit after a 68-hour run.
| Identifier | ExFiles\Box 124\1\ scan0024 | |
| Date | 23th February 1939 | |
| UNIT NO BENTLEY 80. No.1 VALVE DIMENSIONS PASSED TO TEST 9-12-38 COMPLETED TEST 23-2-39 INLET VALVES: — CYLINDER HEAD — EXHAUST VALVES: - EB.7378 (SOD.COOLED) RUNNING TIME:- 68 HRS. MILEAGE:- (18 HRS. 50 MINS F.T.) Diagrams: Valve with dimensions: LENGTH, 2.000, DIA. 'A', 1.350, DIA. 'B' Cross-section of valve seats: "A", "B", "A", "B", POCKETTING First Table: EXHAUST NO | LENGTH: BEFORE | AFTER | DIFFERENCE | DIA. 'A': BEFORE | AFTER | WEAR | DIA. 'B': BEFORE | AFTER | WEAR 1. | 4.9040 | 4.9030 | .0010 | .3718 | .3717 | .0001 | .3718 | .3712 | .0006 2. | 4.9100 | 4.9100 | NIL. | .3715 | .3715 | NIL. | .3715 | .3712 | .0003 3. | 4.9000 | 4.8970 | -.0030 | .3715 | .3715 | NIL. | .3715 | .3712 | .0003 4. | 4.8950 | 4.8920 | -.0030 | .3715 | .3715 | NIL. | .3718 | .3710 | .0002 5. | 4.9020 | 4.8990 | -.0030 | .3718 | .3715 | .0003 | .3718 | .3712 | .0006 6. | 4.8950 | 4.8945 | -.0010 | .3715 | .3715 | NIL. | .3715 | .3712 | .0003 7. | 4.8970 | 4.8960 | -.0010 | .3715 | .3715 | NIL. | .3715 | .3706 | .0009 8. | 4.8910 | 4.8890 | -.0020 | .3715 | .3712 | .0003 | .3715 | .3710 | .0005 EXHAUST 6 7 10 11 Second Table: POCKETTING NO | DIM. 'A': BEFORE | AFTER | DIFFERENCE | DIM. 'B': BEFORE | AFTER | DIFFERENCE INLET 1 4 5 8 9 12 EXHAUST 2 3 6 7 10 11 | ||