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 on valve dimensions for a B.80 unit after a 50-hour engine run.
| Identifier | ExFiles\Box 124\1\ scan0121 | |
| Date | 22th May 1939 guessed | |
| B. 80 UNIT N°3 VALVE DIMENSIONS. PASSED TO TEST:- COMPLETED TEST:- RUNNING TIME:- 50 HRS MILEAGE:- CYLINDER HEAD:- E.B.4098 INLET VALVES:- E.B. 3853 EXHAUST VALVES:- E.B. 3854. LENGTH 1.000" Dia "A" 1.250" Dia "B" POCKETING TABLE OF DIMENSIONS: N° | LENGTH: BEFORE, AFTER, DIFFERENCE | Dia. "A": BEFORE, AFTER, WEAR | Dia. "B": BEFORE, AFTER, WEAR INLET 1 | 4.383, 4.3837, .0007 | .3422, .3421, .0001 | .3422, .3421, .0001 2 | 4.384, 4.3847, .0007 | .3422, .3421, .0001 | .3422, .342, .0002 3 | 4.376, 4.375, .001 | .3422, .342, .0002 | .34225, .3422, .00005 4 | 4.385, 4.383, .002 | .3422, .3421, .0001 | .3422, .342, .0002 5 | 4.384, 4.383, .001 | .3422, .342, .0002 | .3422, .3419, .0003 6 | 4.385, 4.383, .002 | .3422, .3421, .0001 | .3422, .3421, .0001 7 | 4.380, 4.381, .001 | .3421, .3419, .0002 | .3421, .342, .0001 8 | 4.384, 4.384, | .3422, .3421, .0001 | .3422, .3421, .0001 EXHAUST 1 | 4.905, 4.904, .001 | .372, .3718, .0002 | .3719, .3713, .0006 2 | 4.906, 4.905, .001 | .372, .3718, .0002 | .372, .3713, .0007 3 | 4.910, 4.909, .001 | .3718, .3716, .0002 | .3718, .3711, .0007 4 | 4.910, 4.910, | .372, .3718, .0002 | .372, .3712, .0008 5 | 4.912, 4.912, | .3719, .3717, .0002 | .3721, .3715, .0006 6 | 4.910, 4.9102, .0002 | .372, .3719, .0001 | .3721, .3716, .0005 7 | 4.895, 4.895, | .372, .3719, .0001 | .372, .3718, .0002 8 | 4.906, 4.9055, .0005 | .372, .3719, .0001 | .372, .3714, .0006 POCKETING. N° | BEFORE, AFTER, DIFFERENCE | BEFORE, AFTER, DIFFERENCE 1-8 | [All cells empty] | ||