Reducing Noise

Sun (Auckland), Volume II, Issue 504, 6 November 1928, Page 7

Reducing Noise

NEGLECTED DETAIL WHAT SHOULD BE DONE One of the most important details of a ear, the silencer, or muffler, as it is j sometimes called, is often neglected by the ovner-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-neglected unit of motor mechanism. The silencer has for its object the reducing of the impact of the outflowing gases on the air. It is. this impact which causes the noise, which is so objectionable a feature in some cars-—es-pecially in the case of sports cars, winch are often great sinners in regard to the amount of exhaust noise which they allow to be set up. It is unnecessary to tell the niotorist of experience that a good, healthy “back in the exhaust is not a measure of the engine efficiency. There are enough silent cats of line performance on the road to discredit the opinion expressed by some people that an efficient exhaust silencer detracts from efficiency, power, and speed ot the car to which it is fitted. Troubles with silencers arc various, as are the troubles with other departments of the collection of mechanism which goes to make up the whole of the mod er Vis' 'state of affairs generally arises from over-lubrication or the use of a mixture too rich, or it may be occasioned 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. he The silencer should occasionally ne ta When'This^hf demerit should be done thoroughly, even to the i^ n t he the exhaust pipe and manifold ot ti engine.