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).
Technical description and illustration of the 'Nest-o-Cups' silencer.
| Identifier | ExFiles\Box 152\3\ scan0007 | |
| Date | 12th April 1912 | |
| [Handwritten, top left] The Autocar [Handwritten, left margin, vertical] Exhaust [Handwritten, above title] 660 [Title] The “Nest-o-Cups” Silencer. [Subtitle] A Series of Expansion Chambers with Communicating Holes of Large Diameter. [Main Text] THE accompanying illustration shows the “Nest-o'-Cups” silencer in part section. This silencer is manufactured by Messrs. W. H.{Arthur M. Hanbury - Head Complaints} Bailey and Co., Ltd., Salford, Manchester, and on its behalf it is claimed that, while it is extremely efficient as a silencer, it does not put any back pressure on the engine. This latter point is, of course, an important one in view of the prohibition of cut-outs by the new Local Government Board Regulation. The silencer consists of a series of steel cups, no outer casing being necessary, held together by three long bolts which pass from end to end and secure the cups to the two cast ends, upon which are formed the flanges for attaching the inlet and outlet pipes. As will be seen by referring to the drawing, each cup is formed with an eccentric hole or port, and when fitted together the holes in the cups are so arranged that the gases have to take a devious course in passing through. The silencer is, therefore, composed of a series of expansion chambers with one large hole communicating between each pair of chambers. It is claimed, therefore, that the “Nest-o'-Cups” silencer does not become choked by residue forming in the diameter of a number of small holes. It can easily be taken to pieces by removing the three bolts previously referred to, and is fitted together with equal facility. In the event of a silencer becoming damaged from any cause, or if any part of it become corroded by neglect, any one or more of the cups can be separately renewed. Obviously this design lends itself to low cost of production, and the fact that no rivets are used in its construction will not only have some effect in lessening the cost, but will also be attended by the further advantage that there is also no liability for these to rust and shake out. This silencer can be obtained fitted with a cut-out on the inlet flange. Although the use of cut-outs is now prohibited on the road, they are still of considerable service in the garage when the firing of an engine is being tested. [Image Caption] The 'Nest-o'-Cups silencer, part sectional view. The arrows show the course of the exhaust gases. | ||