| Show R AUTO MUfFLER IS Bs NEGLECTED C U Efficiency Increased If Cleaning Done I Periodically If It the th exhaust gases c e were sere to be allowed ed to e escape cape directly Into the th atmosphere the explosions rapidly following follo each other would prove tery ery i cry annoying The muffler os 0 breaking up these gases Into fin fine streams tre ms and by altering allowing them to expand and reducing their pressure pressure pres- pres sure ur until they are nearly of ot the atmospheric pressure deadens deaden the th sound ot of o these explosions without interposing any great amount of back pressure presure It so o admIrably performs Its duties d that it Is li ot- ot otten often of often ten overlooked when hen the rest ot of the car an 0 o The he Internal mechanism of mut mufflers flers ners varies Widely Idely some tome consisting only of ot simple chambers chamber connected together to form a labyrinth for forthe forthe the pas gas passage while the th more complicated forms form hue hase a number of baffle baldo plates or walls pierced With Ith small holes hole The Tho Tl o most et- et effective ef effective and silent type tipe t PC is generally the more mor susceptible u to derangement derange derange- derangement ment ment and will Gh rise e trouble sooner r than the th less leu efficient From time tiffi to time all n mufflers should be cleaned as a a considerable amount ot of carbon deposits accumulate In them As A these the deposits deposit not only tend to Increase the back pressure also tend to hold the heat of the th exhaust the th muffler should be cleaned at once a year Clean out all of soot loot and oil an in the muffler thorough thorough- ly thoroughly with kerosene before bling reassembling bling If It the holes In the partition walls are re clogged ream out thor thor- thoroughly thor with a 0 three cornered tile file making sure ur that all nil residue Is re- re re 1110 d and that none non remains remain to lessen leuen the diameter ot of o these passages pas- pas pasc sages saiu c Mufflers Huffier are ar often oUen seriously damaged or broken by the th Ignition testing methods so commonly used The engine Is run at a 11 rather high rate of oC speed peed and then the ini- ini tion t on la Is 1 turned I 0 oser er er to another sI or oft off entirely Only for a 11 moment nt however when It is again turned on But In the Interval that has elapsed several everal charges of un- un burned unburned gas ha hase been forced Into the muffler The momentum of the tho flY flywheel has carried the th 11 tons tons and nd through h a cycle of 4 operation 10 When hen tho Ignition witch switch Is again thrown on this same am momentum actuates the breaker ker mechanism and a cylinder C cs linder tires fares Often OUen a a flash of et flume flame U ts J JI I J- J 4 fOI forced eed Into the tho muffler the un- un unburned burned un-burned burned gases eases are Ignited and an explosion occurs which often causes s damage maybe yb Overheating Overheating- of oC the th muffler ouen may m be caused by carburetor t-olI t t Ignition es out of time too late 1 Igni tion or clogged closed mufflers Such a n Is generally the result of oC somethinG by which the fhe mixture Is not completely burned In the combustion chambers but continues to burn In the pipe and muffler A too Ich rich mIx mIx- mIxture mixture mix mixture ture burns slowly Iy and will will still lIe le burning when hen the exhaust ah e opens If It the exhaust salve alve ol opens too soon the burning gases cases will escape before beCore completing their work ork Very late lot Ignition does not give the charge charce enough time to be completely burned before the ex- ex Iaus ex valie ah e opens Automobile opens Digest I |
