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).
Advertisement for the Burgess Straight-through Silencer, explaining its function in eliminating back pressure and its benefits.
| Identifier | ExFiles\Box 152\3\ scan0090 | |
| Date | 28th October 1932 guessed | |
| BACK PRESSURE CAUSES:- Loss of Power Poor Acceleration Overheating Burnt Valves High Fuel Consumption. N.B.—Every Burgess silencer is British made THE elimination of back pressure is one of the most important problems with which every engine designer is faced. After each explosion the combustion chamber must be rapidly and completely cleared of exhaust gases. If this is not done, what happens? First of all, the engine cannot develop its full power. Any residue of gas that remains in the cylinder head has the effect of diluting the incoming highly explosive mixture. In addition, of course, the effort of forcing out the exhaust gases through a system of expansion chambers inevitably causes a retarding effect upon the upward movement of the piston. Thus, acceleration is impaired. Further, it has been conclusively proved that back pressure is a very frequent cause of burnt exhaust valve seatings, and warped valves. Because the exhaust gases cannot be rapidly expelled the engine runs at higher temperature—and overheating plays havoc with piston rings and bearing surfaces. It is obvious that any Silencer with internal baffles or other restrictions must impede the free flow of the exhaust gases—and therefore create back pressure. Your own engine may appear to run smoothly—to possess good acceleration and adequate power. But until you have fitted a Burgess Straight-Through Silencer you can have no idea of the improvement in performance which can be effected at so trifling cost. Image of a cutaway silencer with the label 'BURGESS'. Image of a person looking through a tube. Caption: There are no baffle plates or other obstructions to impede the flow of the exhaust gases in a Burgess Silencer. You can see straight through the centre perforated tube. The new BURGESS Straight-through SILENCER eliminates BACK PRESSURE THE illustration above explains at a glance precisely how the Burgess Straight-Through Silencer functions. The exhaust gases are passed straight through the inner perforated tube. There are no restrictions of any kind. The inner tube is entirely surrounded by an acoustic filling which is encased in an outer tube sealed at each end. There is nothing in a Burgess Straight-Through Silencer to wear out or to need replacement. Being made of high grade sheet steel it will outlast the car. The insulating properties of the acoustic filling reduce the working temperature of the Silencer to a very considerable extent. A further advantage is the fact that the Burgess Straight-Through Silencer having no baffle plates does not accumulate carbon and does not require periodical cleaning. Every Burgess Silencer sold in this country is British made throughout. It is available in a wide range of sizes to suit all makes of cars and can be fitted by any garage quickly and easily. So that every car owner can test our claims we offer a Burgess Straight-Through Silencer on seven days' free trial. If you are not completely satisfied your money will be returned in full. Prove it! Seven Days' Trial Offer ALTHOUGH but recently introduced the Burgess Silencer has become a standard fitment on a large number of leading American and British Cars. These manufacturers conducted the most searching tests before deciding to use it. In view of the revolutionary design of the Burgess Silencer we welcome such tests because we are confident of the ultimate results. Every Burgess Silencer is sold on the understanding that if it does not fulfil our claims of improved acceleration, increased power and reduced fuel consumption, the purchaser's money will be refunded in full, if the Silencer is returned undamaged within seven days. Types for all popular makes of cars | ||