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).
The condition and wear of various engine valves after test-bed running.
| Identifier | ExFiles\Box 88\4\ scan0201 | |
| Date | 25th February 1937 | |
| 254 To Rm.{William Robotham - Chief Engineer} from HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} c. to HPS.{Horace Percy Smith - Experimental Factory Mgr} c. to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} UNIT B. 19. REPORT ON VALVES. Inlet Valves 1, 4 and 5 Ex.23305. produced in S.65. ) " " 8, 9 and 12 EB.2793 " " S/SLV.) Fitted Exhaust Valves 2,3 and 6. EB.2970. " " S/SLV.) 13.1.37. " " 7,10 and 11. EB.2794. " " KE.965.(Stellited) All valves except the three KE.965 valves have completed 50 1/2 hours test-bed running, including 17 hours 50 mins. at full throttle and 4 hours 40 mins. at 1/4 load. The KE.965 valves, fitted 1.2.37., have only completed 22 hours 10 mins., 7 hours 50 mins. of which were at full throttle. The S.65 valves were in very good condition, there being no signs of cracks or pitting, very little wear on the seats and none whatever on the stems. The S/SLV inlet valves too were in good condition, but some wear has taken place on the seats of Nos. 8 and 9. No wear has taken place on the stems and there are no signs of cracks or pitting. The S/SLV exhaust valves, however, were not in good condition. No. 3 particularly, and No. 2 to a lesser extent, were badly pitted on the radius above the valve-seat and at the bottom of the stem. No wear has taken place on the stems, but the seat of No. 2 has worn .011"* on one side, those of Nos. 3 and 6 having worn .005"* and .006"* respectively. The KE.965 valves which have done less than half the running-time of the other valves, have all got faint vertical lines at the bottom of the stem, where the radius starts, and also faint traces of pitting. These vertical lines, which are too fine to be called cracks, seem to be peculiar to KE.965 valves, as there have been several instances of them before. These valves are the only ones on which wear has taken place on the stems, but unfortunately no figures for "pocketting" were taken before they were fitted, so that it is not possible to say whether any wear has taken place on the seats, which were Stellited. * As these figures are obtained from "pocketting", they include wear on cylinder head All the above details are shown on chart herewith. continued. | ||