REDUCING NOISE

Shannon News, 21 December 1928, Page 4

REDUCING NOISE

WHAT SHOULD BE DONE. One of the most important details of a car, tho silencer," or muffler, as it is called, is often neglected by the owner driver. It is out of the way and awkward to get at, and any adjustment to it is generally a dirty and uncomfortable job. Nevertheless, states the Dunlop Bulletin, the owner who would keep his car in the best running condition should periodically give some little attention to this much-negleetod unit of motor mechanism.

The silencer nas for its object the reducing of tho impact of the outflowing gases on the air. It is this impact wheh causes the noise, which is so objectional a feature in some cars—especially in the case of sports cars,, which are often great sinners in re- 1 gard to the amount of exhaust noise which they allow to be setyup. It is unnecesasry to tell- the motorist of experience that a good healthy ‘ ‘ back' ’ in the exhaust is not a measure of the engine efficiency. 1 There are enough silent cars of fine performance on the road to discredit the opinion expressed by some people that an efficient exhaust silencer detracts from'efficiency, power, and *peed of the car to which it is fitted.

Troubles with silencers are various as are the troubles with other departments of the collection of mechanism which goes to make up the whole of the modern car.

1 This state of affairs generally arises from over-lubrication or the use of a mixture too rich, or it may be occasion-ed-by too much driving on low gear and is more frequent in the case of cars used in hilly districts and winding, narrow, hilly roads. Tho silencer should occasionally be taken down and cleaned out. When this is done it should be done thoroughly, even to the taking down of the exhaust pipe and manifold of the engine.