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 proposal for a reduced diameter swan neck exhaust pipe to reduce noise.
| Identifier | ExFiles\Box 172\1\ img052 | |
| Date | 21th December 1923 | |
| R.R. 755 (10M) (SL 72 18-7-23) MP 274954s. COMPLETED 10.1.24. STANDARDISATION of CHASSIS PARTS. Date 21.12.23. No. 4238 Description of Parts: REDUCED DIAMETER SWAN NECK EXHAUST PIPE. Origin: 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. 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. £ Cost of Old Part. £ Weight of New Part. £ Cost of New Part. £ Difference per Car. £ 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 | | MR. B. JOHNSON | 10.1.24 | Agreed. BJ.— M.{Mr Moon / Mr Moore} make memo thus. MR. ROYCE | 6/1/24 | Agreed FHR We find output very desirable in silence and recommend we fit this when we have got it right - am much pleased with the ride on BG but some more improvement I expected to pleasing, Our pipe horn is very desirable here in addition to the Klaxon which is standard. MR. WORMALD | 21.12.23 | Agreed. Wor.{Arthur Wormald - General Works Manager} MR. ROWLEDGE | 28.12.23 | Agreed. Re. MR. DAY | 28/12/23 | agreed DA{Bernard Day - Chassis Design} MR. BAILEY | 27.12.23 | Agreed. BY.{R.W. Bailey - Chief Engineer} Stand all illegal in the town. 5G has no horn. 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 CE 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.{Mr Elliott - Chief Engineer} Hives. [Watermark: CHASSIS] | ||