EXHAUST MUFFLERS

Rotorua Morning Post, Volume 2, Issue 344, 4 October 1932, Page 2

EXHAUST MUFFLERS

Any factor which impedes the free escap'e of burnt gas froni the . cylinders of a motor engine when the ex.haust valves open is a. prolific source of power loss, be.cause, if portion of the bufned-out charge femains in the cylind.er,. obviously the quantity of n'ew fuel which can be admitted for the next firing stroke is reduced, and , the output or power from the engine sulfers. So cielicate. is. the response of an engine to these "back pr,essures" that even the employment of an ordinary silencer invariably causes small power losses. These, however, are dften. .cgnsiderably .greater th'.ari tHey sbould be througb neglect of the

silencer. The. muffler chamber. is one of the parts of a car least acce.ssible to the owner, and for this. reasoh, the silencer often receives no attention, through. the life of- the car. Consistent bad pulling, which is proved not to be caused by faulty earburettion, ignition, or leaky valves, or pistons, can. often be traced. to the paritai blocking of.the escape.passages^ip the j muffler by the accuniulation of ca'i'bpn. If ..excessive c.arbonisation in tha silencpr is suspecte^, the car ?hould. b.e . handed over to a mechanic to remove the deposits.