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).
Valve dimensions and pocketting measurements before and after a 15,000-mile test.
| Identifier | ExFiles\Box 97\4\ scan0203 | |
| Date | 24th November 1938 guessed | |
| UNIT No BIII No.5. No. 1. 4+5. No. 8, 9+12. VALVE DIMENSIONS EX. 29686 S/65 INLET VALVES :- EVV. 1859 MOTOR COMPONENTS. EXHAUST VALVES :- EX. 29687 KE. 965 (STELL) PASSED TO TEST COMPLETED TEST CYLINDER HEAD EX. 29685 RUNNING TIME :- MILEAGE :- 15,000 [Diagram of a valve with dimensions labeled: LENGTH, 2.000, DIA. A, 1.350, DIA. B] [Diagram of valve seats labeled: "A" "B" "A" "B", POCKETTING] FIRST TABLE: No, LENGTH (BEFORE, AFTER, DIFFERENCE), DIA. A (BEFORE, AFTER, WEAR), DIA. B (BEFORE, AFTER, WEAR) INLET 1, 4.411, 4.411, NIL, .3417, .3413, .0004, 3.4125, 3.409, .0035 4, 4.407, 4.405, -.002, .3415, .3413, .0002, 3.411, 3.410, .0001 5, 4.415, 4.412, -.003, .3413, .3411, .0002, 3.410, 3.4075, .00025 8, 4.418, 4.416, -.002, .342, .342, NIL, 3.420, 3.419, .0001 9, 4.420, 4.417, -.003, .342, .342, NIL, 3.420, 3.418, .0002 12, 4.417, 4.415, -.002, .342, .3419, .0001, 3.420, 3.418, .0002 EXHAUST 2, 4.438, 4.433, -.005, .3407, .3405, .0002, 3.407, 3.400, .0007 3, 4.435, 4.434, -.001, .3404, .3403, .0001, 3.406, 3.397, .0009 6, 4.436, 4.438, +.002, .3407, .3405, .0002, 3.408, 3.402, .0006 7, 4.435, 4.436, +.001, .340, .340, NIL, 3.402, 3.395, .0007 10, 4.435, 4.434, -.001, .3402, .3399, .0003, 3.402, 3.390, .0012 11, 4.435, 4.433, -.001, .3397, .3395, .0002, 3.3975, 3.385, .00125 POCKETTING SECOND TABLE: No, DIM: 'A' (BEFORE, AFTER, DIFFERENCE), DIM: 'B' (BEFORE, AFTER, DIFFERENCE) INLET 1, 1.119, 1.119, NIL., 1.116, 1.121, .005 4, 1.105, 1.120, .0095, 1.1125, 1.120, .0075 5, 1.116, 1.124, .008, 1.1165, 1.124, .0075 8, 1.117, 1.123, .006, 1.1155, 1.118, .0025 9, 1.165, 1.120, .0035, 1.120, 1.123, .0077 12, 1.285, 1.285, NIL., 1.125, 1.131, .006 EXHAUST 2, 1.0985, 1.120, .0215, 1.0985, 1.118, .0195 3, 1.0865, 1.112, .0255, 1.0855, 1.112, .0265 6, 1.0905, 1.100, .0095, 1.092, 1.112, .020 7, 1.088, 1.122, .034, 1.089, 1.122, .033 10, 1.0855, 1.110, .0245, 1.085, 1.113, .0255 11, 1.092, 1.116, .0240, 1.091, 1.117, .026 | ||