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Show TO THE AUTOMOBILE AUTO-MOBILE OWNER By A 8 Meterve. It is quite rcmhrkablo the great change of attitude of the auto owner and buyer as well to the automobile business in tho last three or four years. Fonhalty the salesman sold on his owtn personality, his persuasive persua-sive talk and many times on his bluff. Now all this Js chhnged. The owner makes a study of his car and Its parts. You find .him often asking questions and ;maklng a careful and 'systemic study" of 'his machine. Even .the prospective buyer now makes a 'careful attidy of the" specifications ot all, cars, before he buys 'and this is as It should be., I was surprised the other oth-er day to be asked -by a posslblo buyer to tell him what a four cycle engine Is.' For the benefit of others I will explain it briefly. All but four ot the automobiles manufactured In the United States have four cycle motors. The power of the motors, of course, produced by burning or explod'ng charges of gas In the cylinders abovn tho pistons, which In expanding, force the plstdns down and so act to turn tho crank shaft. But In tho four cycle motor, of which nearly nil American cars nro examples, It takes four strokes of tho piston, or two complete revolutions of the crank shaft, for each explosion or working stroke In any one cylinder. This tdkes place ns follow: As tho piston starts down on tho first stroke of' the cycle the inlet valve Is opente". The motion ot the piston tends to create n acuuni In tho cylinder end this sucks In o charge of gau throurh the Intalo valve from tho. uvMireter. When tho piston $ias reJbod the bot'ora of Its stroke and tiarts back the Intike valvej'closes and the piston out. prefises the ga it ha taken, In, into th(.space,.ftt)he topoXtbe cyl'adc Just before the , r'.tton reaches tho end of the upward trrke the &aa la expjoded by an electric spark which occurs at the, points of the spark plug. The explosloi creates a larKn amount of heat an! pressure which pushes the piston down durlig the next or working stroke ot tho -.n.nk shaft. On the return upward stroke ot i.hi piston tho exhaust valve Is opeaod and tho. piston pushes the remaining burnt gas out of the new eye'e. It will be noticed from the above that only one stroko out of four In a working stroke for each cylinder but as there are four cylinders to en'.h engine, the crank shaft really r.icoiyej two Impulses evory revolution. |