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Show Why Your Motor Loses Its Power at High Altitude Motorists who have returned from a summer touring trip to the mountains moun-tains are still wondering over tho queer performance of their cars. Tho boat was running well as tho motor party left home. But somehow some-how she lost pp when touring the Jielghts. The engine overheated more easily And the car was not so good on hill work. On returning home, however, the Old PP came back. The engine performed per-formed as well as ever and the car climbed the hills with ease. The answer to this mystery Is altitude. alti-tude. The hlgh.-r the car ellmbs the rarer is the atmosphere and the more difficult becomes tho engine's ability to perform. AIR PRESSURE. As the car goes higher, the pressure pres-sure of air is reduced. Normal nlr pressure at sea lev-l Is 15 pounds to the square Inch. But at Denver, for example, which Is a mile above sea level, the air pressure lsr only 12 pounds. This reduction In air pressure has a material effect on the power pro- j duced by the gasoline engine. The I compression of the engine Is reduced t and this directly affects the power behind the piston stroke. 1 Tho reduced weight of the air also affects the combustion In the cylin- i dcrs. Besides lower compression, therefore, there Is rIso a reduction In amount of air needed for complete com-plete combustion of the fuel. This means that the supply of fuel must be cut down proportionately to main-tain main-tain proper combustion In tho engine.. All this means less power. OPEN Am INTAKE. To make up for this loss in power 1 lit Is best to open up the. air intake, r;ithr-r than cut down on the needle JH valve of the carburetor. H At higher altitudes, the boiling point of the water falls off. Which JH means there Is a greater danger of I overheating the engine at such BHb heights, Therefore, It Is well to re-plenlsh re-plenlsh the water more often than at HHJ lower BHH When the motorist comes down HHV from the highlands h,e finds he has HHV to readjust his carburetor to heavier atmosphere. If he happened to do this JH before he went up. HHH |