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).
Standardisation of a reduced diameter swan neck exhaust pipe to reduce noise.
| Identifier | ExFiles\Box 48\4\ Scan202 | |
| Date | 21th December 1923 | |
| R.R. 755 (10M) (SL 72 18-7-23) MP 274954s. X4238 COMPLETED 10.1.24. STANDARDISATION of CHASSIS PARTS. Date 21.12.23 Description of Parts. REDUCED DIAMETER SWAN NECK EXHAUST PIPE. Origin (AS) To reduce noise. Experimental Test Report. It is proposed to reduce the dia. of the swan-neck exhaust pipe from 1.500" to 1.375". This reduces the exhaust noise and there is no drop in performance at any speed. Road Test Report. Run 2000 miles on 4-G-11. X No. 4238 Drawing No. Part List A Scrap and replace at all costs, including Chassis already delivered to customers. B Scrap and replace on Chassis in works. C Scrap present stock and replace on all Chassis not yet handed to test. D Use existing stock Alteration effective on future Chassis. Weight of Old Part. £ Weight of New Part. £ Difference per Car. £ Cost of Old Part. £ Cost of New Part. £ Difference per Car. £ Negligible. Cost of Parts in Works which will be scrapped if commenced on:- Series.......... £ .......... Series.......... £ .......... Series.......... £ .......... Signature of Mr. De LOOZE that above is correct. My/JW 9.1.24. SIGNATURES | DATE | REMARKS MR. JOHNSON | 24.12.23 | agreed Johnson MR. B. JOHNSON | 10.1.24 | agreed BJ MR. ROYCE | 6.1.24 | Agreed. FHR. See R4/M7.1.24. MR. WORMALD | 21.12.23 | Agreed. Wor. {Arthur Wormald - General Works Manager} MR. ROWLEDGE | 28.12.23 | Agreed. Rg. {Mr Rowledge} MR. DAY | 28.12.23 | Agreed. Da. {Bernard Day - Chassis Design} MR. BAILEY | 27.12.23 | Agreed. BY. {R.W. Bailey - Chief Engineer} MR. PLATFORD | 21.12.23 | Agreed. EP. {G. Eric Platford - Chief Quality Engineer} Consider very necessary and advisable to bring in as soon as poss. Customers now complain. MR. ELLIOTT | 29.12.23 | Agreed. E. {Mr Elliott - Chief Engineer} MR. NORTHEY | 20.12.23 | Hurrah! But I think that this result should be confirmed on another car. PN. {Mr Northey} MR. HIVES | 9.1.24 | Agreed. E.Hives. [Watermark: A.P. CHASSIS] | ||