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).
Dimensions and condition of engine valves before and after a test run.
| Identifier | ExFiles\Box 88\5\ scan0239 | |
| Date | 20th February 1937 | |
| UNIT Nº B19 VALVE DIMENSIONS. DATE MEASURED.- BEFORE TEST 17-1-37 AFTER TEST 20-2-37 ALL VALVES NEW BEFORE TEST. INLET VALVES { 1, 4 & 5 EX23305 IN S.65. { 8, 9 & 12 EB2793 S/SLV. RUNNING TIME TOTAL - 50 1/2 HRS FULL THROTTLE 17 HRS 50 MINS. 1/4 LOAD 4 HRS 40 MINS. AT 4000 TO 4500 RPM LENGTH & DIA. TABLE Nº | LENGTH BEFORE | LENGTH AFTER | LENGTH DIFF. | DIA. BEFORE | DIA. AFTER | DIA. DIFF. 1 | 4.515 | 4.514 | -·001 | ·3418 | ·3418 | NIL 4 | 4.5135 | 4.512 | -·0015 | ·342 | ·3420 | NIL 5 | 4.508 | 4.507 | -·001 | ·3419 | ·3419 | NIL 8 | 4.532 | 4.530 | -·002 | ·3415 | ·3415 | NIL 9 | 4.532 | 4.530 | -·002 | ·3412 | ·3412 | NIL 12 | 4.531 | 4.530 | -·001 | ·3415 | ·3415 | NIL 'POCKETTING'. CYL.HEAD. EB.2925. I/C. POCKETTING TABLE (INLET VALVES) Nº | LENGTH 'A' BEFORE | LENGTH 'A' AFTER | LENGTH 'A' DIFF. | LENGTH 'B' BEFORE | LENGTH 'B' AFTER | LENGTH 'B' DIFF. | MATERIAL 1 | 1·014 | 1·0175 | ·0035 | 1·0125 | 1·016 | ·0035 | IN S.65. 4 | 1·013 | 1·0175 | ·0045 | 1·0135 | 1·0175 | ·004 | IN S.65. 5 | 1·013 | 1·016 | ·003 | 1·0135 | 1·017 | ·0035 | IN S.65. 8 | 1·022 | 1·030 | ·008 | 1·023 | 1·030 | ·007 | IN S/SLV 9 | 1·025 | 1·033 | ·008 | 1·023 | 1·033 | ·010 | IN S/SLV 12 | 1·014 | 1·017 | ·003 | 1·014 | 1·016 | ·002 | IN S/SLV EXHAUST VALVES { 2, 3 & 6 EB2970 IN S/SLV. { 7, 10 & 11 EB2794 IN KE965. (STELLITE SEAT & TIPS) RUNNING TIMES - VALVES 2, 3 & 6 SAME AS INLET VALVES LENGTH & DIA. TABLE (EXHAUST VALVES) Nº | LENGTH BEFORE | LENGTH AFTER | LENGTH DIFF. | DIA. BEFORE | DIA. AFTER | DIA. DIFF. 2 | 4.5290 | 4.527 | -·002 | ·3408 | ·3408 | NIL 3 | 4.5270 | 4.525 | -·002 | ·3410 | ·3410 | NIL 6 | 4.5285 | 4.526 | -·0025 | ·3408 | ·3408 | NIL 7 | 4.5290 | 4.527 | -·002 | ·3410 | ·3409 | -·0001 10 | 4.5320 | 4.531 | -·001 | ·3395 | ·3391 | -·0004 11 | 4.5270 | 4.526 | -·001 | ·3407 | ·3402 | -·0005 POCKETTING TABLE (EXHAUST VALVES) VALVES 7, 10 & 11 FULL THROTTLE 7HRS 50 MINS TOTAL - 22 HRS 10 MINS Nº | LENGTH 'A' BEFORE | LENGTH 'A' AFTER | LENGTH 'A' DIFF. | LENGTH 'B' BEFORE | LENGTH 'B' AFTER | LENGTH 'B' DIFF. | MATERIAL 2 | ·998 | 1·009 | ·011 | ·999 | 1·008 | ·009 | IN S/SLV 3 | 1·000 | 1·005 | ·005 | 1·001 | 1·005 | ·004 | IN S/SLV 6 | 1·009 | 1·015 | ·006 | 1·007 | 1·0135 | ·0065 | IN S/SLV 7 | NO RECORD | | | | | | IN KE965 (STELLITED) 10 | NO RECORD | | | | | | IN KE965 (STELLITED) 11 | NO RECORD | | | | | | IN KE965 (STELLITED) CONDITION OF VALVES INLET VALVES 1, 4 & 5 EX23305 PRODUCED IN S.65 CONDITION GOOD. NO SIGNS OF CRACKS OR PITTING. INLET VALVES 8, 9 & 12 EB2793 PRODUCED IN S/SLV CONDITION GOOD. NO SIGNS OF CRACKS OR PITTING. EXHAUST VALVES 2, 3 & 6 EB2970 - S/SLV. Nº 3 VERY BADLY PITTED ON RADIUS ABOVE VALVE SEAT AND ON STEM AT BOTTOM. Nº 2 SIMILAR BUT TO A MUCH LESSER DEGREE. EXHAUST VALVES 7, 10 & 11 - EB 2794 - KE965 FAINT VERTICAL MARKINGS AND PITTING AS SHOWN BELOW. Diagram Notes: FAINT VERTICAL LINES AND PITTING ON THE THREE KE.965. VALVES. VIEW IN DIRECTION OF ARROW. VERY BAD PITTING ON S/SLV'T VALVE Nº 3 ON RADIUS AND STEM. Nº 2 ALSO AFFECTED TO A LESSER DEGREE. ROLLS-ROYCE LTD. PRINT ROOM. 25 FEB 1937 DERBY | ||