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 analysis of faults related to exhaust systems, manifolds, and silencers across various vehicle models.
| Identifier | ExFiles\Box 47\3\ Scan254 | |
| Date | 30th September 1931 guessed | |
| -8- 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. EXHAUST SYSTEM. September Quarter. C.C. 21 37 5 24 87 } 111 W.P. 9 6 - 9 24 } Previous " C.C. 20 25 8 23 76 } 99 W.P. 10 3 3 7 23 } Six months. 60 71 16 63 210 210 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 re-inforced downpipe flange is being used on all 20 HP. cars to cure blows. See Depot Sheets Nos. Hd.{Mr Hayward/Mr Huddy}132/145/170/187/201/209. This job generally requires further improvement, as we cannot guarantee a cure in all cases. EXHAUST MANIFOLD CRACKED OR BROKEN. September Quarter. C.C. 9 12 3 2 26 } 42 W.P. 10 4 2 - 16 } Previous " C.C. 8 7 7 - 22 } 40 W.P. 12 4 2 - 18 } Six months. 39 27 14 2 82 82 EXHAUST SILENCER CORRODED. September Quarter. C.C. 2 - 9 - 11 } 13 W.P. - - - 2 2 } Previous " C.C. 1 1 1 1 4 } 4 W.P. - - 1 - - } Six months. 3 1 10 3 17 17 Silencers generally have a short life. Experimental Departmenr now investigating this matter. | ||