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).
Letter from a piston ring supplier discussing progress and issues with AC.9 bearings and big end bearings for 4 and 6 cylinder engines.
| Identifier | ExFiles\Box 115\4\ scan0004 | |
| Date | 13th July 1939 | |
| 1020a. SERVICE DEPOTS LONDON 89 BLACKFRIARS RD S.E.1 TELEPHONE: WATERLOO 5762/3 172 GT. PORTLAND ST.{Capt. P. R. Strong} W.1 TELEPHONE: MUSEUM 2433 119 LEYTONSTONE RD STRATFORD E.15 TELEPHONE: MARYLAND 2439 BIRMINGHAM 143 SUFFOLK STREET TELEPHONE: MIDLAND 0638 MANCHESTER 232 DEANSGATE TELEPHONE: BLACKFRIARS 8914 NEWCASTLE MILLICAN'S BUILDINGS, MARKET ST TELEPHONE: 23874 SERVICE DEPOTS LIVERPOOL 75 PARADISE STREET TELEPHONE: ROYAL 5786 LEEDS 82 WOODHOUSE LANE TELEPHONE: 25774 CROYDON 246 HIGH STREET TELEPHONE: 6121-2 SOUTHAMPTON 17 PORTSWOOD ROAD TELEPHONE: 74748 HULL 285 ANLABY ROAD TELEPHONE: 15312 CANTERBURY 21 & 22 ROSE LANE TELEPHONE: CANTERBURY 2456 ON ADMIRALTY, WAR OFFICE AIR MINISTRY, INDIA OFFICE LISTS WELLWORTHY PISTON RINGS LIMITED PISTON & PISTON RING SPECIALISTS LYMINGTON HANTS WORKS & HEAD OFFICE STANFORD RD DIRECTORS: G.{Mr Griffiths - Chief Accountant / Mr Gnapp} H.{Arthur M. Hanbury - Head Complaints} ALEXANDER J.{Mr Johnson W.M.} W. HOWLETT C. B. KAY P. WALDEN C. W. WATERS A.{Mr Adams} J.{Mr Johnson W.M.} WOOLCOTT OUR REF FB/CJR. Ext.26. TELEPHONE: LYMINGTON 520 (5 LINES) TELEGRAMS: WELLWORTHY CODE: MARCONI YOUR REF 13th July, 1939. For the attention of Mr. Salt. Messrs. Rolls-Royce, Limited, Derby. File Dear Mr. Salt,, You will be interested to know that in general we still continue to make satisfactory progress on AC.9 bearings. There is, however, one particular job on which we think any advice or help which you may have to offer would be welcome, and it may be that we could arrange a visit together to Dennis Bros. of Guildford. I would mention that they have two engines developing practically the same power, one being a 4 cyl., and the other a 6 cyl. engine. The load on the projected area of the big ends is, if anything, heavier on the 4 cyl., but no trouble has been experienced on the big end bearings of these 4 cyl. engine. I am enclosing herewith drawing of the two big end bearings in question. You will note that the wall thickness of the 4 cyl. bearing is thicker than the 6 cyl. This really is about the only difference in the proportions of the two jobs. The trouble on the 6 cyl. is the continual spreading of the big end bearings under load. In the course of a post or so I will forward to you two big end bearing halves, from which you will note that the back of the bearing, when placed against a straight edge, shows that it is hollow in the middle, and there are certainly peculiar features about the bearings that we feel it is best for you to examine for yourself, and perhaps you would also like to pass them over to Mr. Hall to get his opinion as to what might be Enclosure | ||