SILENT EXHAUST

Dominion, Volume 14, Issue 244, 9 July 1921, Page 13

SILENT EXHAUST

FOR INTERNET, C’OMBSTION ENGINES. The problem of silenoing the exhaust from internal combustion engines has engaged the attention of engineers for many years, and countless devices have been invented with moro or less success, for the purpose. Hitherto the appliances required for the marine typo of internal combustion engine have occupied a good deal of space, and added con. siderably to the weight of the vessel I;i order to overcome these drawbacks a British firm of engineers has deviser) appliances in which the energy of the exhaust gases are used to put in motion a comparatively large body of cooling water or air. The exhaust gases are forced to come out from below a large spring-loaded valve in a stream between two plates under water, inducing the water to circulate, and cooling themselves af the same time. The only resistance offered, to the flow of tho gases is the light resistance of the spring and of a few inches of water, so that very little back pressure is exercised. Where air cooling is used, a similar principle is adopted. Both types have been successfully at work for some time, the former on engines up to 79,(XX1 brake horse-power and tho latter o-n engine* of 1500 brake horse-power.