Analysis of engine valve condition, cracking, and wear after 16,900 miles in France.
| Identifier | ExFiles\Box 82\5\ scan0186 | |
| Date | 17th July 1937 | |
| B.3. UNIT. VALVES AFTER 16,900 MILES IN FRANCE. ExI178. INLET VALVES EB 2793 IN S/SLV WERE IN GOOD CONDITION AND WERE NOT CRACKED. NO MEASUREMENTS WERE TAKEN BEFORE TEST. EXHAUST VALVES EB 2970 IN KE965 (STELLITED) WERE ALSO IN GOOD CONDITION APART FROM Nos 2 & 11 WHICH WERE CRACKED AS SHOWN BELOW EB 2794 VALVES ALWAYS CRACKED HERE. EB 2970 VALVES WHICH HAVE BEEN STRENGTHENED AT THE ABOVE POINT AND ON THE RADIUS, NOW CRACK HERE. Nos 2 & 11 VALVES CRACKED AS SHOWN ABOVE. EB 2970 VALVES HAVE RECENTLY BEEN STANDARDISED. THIS DIMENSION TAKEN FOR STRETCH BECAUSE WHEN THE VALVES ARE POLISHED, MATERIAL IS REMOVED FROM THE FRONT OF THE HEAD, GIVING RISE TO INACCURACIES. ON THE BACK OF THE HEAD, HOWEVER, THE HARDENED STELLITE SEAT PREVENTS THIS. TABLE: No | STRETCH | WEAR ON STEMS 2 | .008 | NIL 3 | .0005 | .0001 6 | .006 | .0002 7 | .005 | .00035 10 | .0035 | .00025 NO MEASUREMENTS FOR No 11 AS IT WAS CUT-UP IN LABORATORY. ROLLS-ROYCE. LTD. PRINT ROOM 17 JUL 1937 DERBY. C.A.W 16/6/37 | ||
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).