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).
Statistical report on exhaust system complaints for various models over six-month and quarterly periods.
| Identifier | ExFiles\Box 47\3\ Scan525 | |
| Date | 31th December 1932 guessed | |
| - 6 - 20 HP. 25 HP. PH.I. PH II. TOTAL. GRAND TOTAL. REMARKS. TOTAL EXHAUST COMPLAINTS December Quarter. C.C. 3 17 7 40 67) W.P. 1 7 1 27 36) 103 Previous " C.C. 4 15 7 38 64) W.P. 8 9 1 42 60) 124 Six Months. 16 48 16 147 227 227 EXHAUST MANIFOLD CRACKED OR BROKEN. 20 HP and early 20/25 - Exhaust Manifolds with cooling fins are now available. No failures of this type yet reported. Depot Sheet Hd. {Mr Hayward / Mr Huddy} 229. Ph.I - Expansion allowance now increased and malleable castings available. Also sliding joint type of exhaust manifold being tried out for extreme cases. Ph.II - Flange bosses now thickened up to prevent cracking. December Quarter. C.C. 3 8 1 1 12) W.P. 1 3 - 1 6) 18 Previous " C.C. 2 6 4 1 13) W.P. 8 6 - - 14) 27 Six Months. 14 23 5 3 45 45 EXHAUST SILENCER CORRODED. All silencers are now being Parkerised and a longer life is expected. December Quarter. C.C. - 1 3 - 4) W.P. - - 2 2 2) 6 Previous " C.C. - - 2 2 4) W.P. - - 1 - 1) 5 Six Months. - 1 6 4 11 11 EXHAUST BLOWS GENERALLY & CUTOUT SEIZED OR RATTLE. This trouble on Ph.II is caused by the sliding joint not working properly and is cured by modifying the sliding joint and fitting an additional stay to the rear silencer as per Depot Sheets Hd. {Mr Hayward / Mr Huddy} 199 and Hd. {Mr Hayward / Mr Huddy} 218. Cutout seizure on Ph.II is having attention of Design Dept. December Quarter. C.C. - 8 4 39 51) W.P. - 4 - 24 28) 79 Previous " C.C. 1 6 1 34 42) W.P. - 3 - 42 45) 87 Six Months. 1 21 5 139 166 166 | ||