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).
Quarterly report detailing failures and remedies for exhaust systems across different models.
| Identifier | ExFiles\Box 47\3\ Scan195 | |
| Date | 30th June 1931 guessed | |
| EXHAUST SYSTEM. 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. June Quarter. C.C. 20 25 8 23 76 } 99 Late 20 HP. and early 20/25 HP. - Strengthened type Exhaust Manifold available and are now being fitted. Awaiting results of this type after further running. Ph.I. expansion allowance now increased and malleable castings available to remedy fractures. 20/25 HP. New steel washers with all copper shell instead of half brass and half copper to cure blows are now available. 20 HP. A reinforced downpipe flange is being used on all 20 HP. cars to cure blows. See Depot Sheets Nos. Fd.{Frank Dodd - Bodies}132/145/170/187/201/209. This job generally requires further improvement. W.P. 10 3 3 7 23 } Previous " C.C. 21 25 5 16 67 } 90 W.P. 6 5 3 8 23 } Six months. 57 59 19 54 189 189 EXHAUST MANIFOLD, CRACKED OR BROKEN. June Quarter. C.C. 8 7 7 - 22 } 40 W.P. 12 4 2 - 18 } Previous " C.C. 4 9 7 1 21 } 39 W.P. 8 8 2 - 18 } Six months. 32 28 18 1 79 79 EXHAUST SILENCER CORRODED. June Quarter. C.C. 1 1 1 1 4 } 4 Silencers generally have a short life, Experimental Dpt. now investigating this matter. W.P. - - - - - } Previous " C.C. - - 3 - 3 } 3 W.P. - - - - - } Six months. 1 1 4 1 7 7 | ||