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Show NEWSPARKPLUGS COT CAB EXPENSE Savings in Oil and Gas More Than Pay for Devices and Power Is Better. Very careful experiments by motor car manufacturers have proved that it Is actual waste and unfair to a motor mo-tor car to run it more than a year with the same set of spark plugs. Thousands of motorists have found that a new set of plugs after S,000 to 10.000 miles, running not only make better performances certain but actually actual-ly save oil and gas to more than pay for the new spark plugs. Real Economy. Why it is real economy to do this is easily understood when the part spark plugs play in engine operation is definitely known. In the engines used in motor cars today, the chaige is fired in each cylinder at every other revolution of the crank shaft. This means that the spark plugs are called on to deliver the firing spark from GOO to 1,500 times per minute, according to the speed of the engine. The temperature around the firing points runs from 000 degrees up to 2,000 degrees Fahrenheit, the average being around 1,200. In most motors, oil is being continuously splashed on and burned off the spnrk plug. This tremendous heat and stress, due to the hammer-like blows of the compression com-pression and firing strokes, gradually affect the efficiency of the spark plug, no matter how well made it may be. The oil adheres to the surface of the core affecting Its insulating properties and allowing for surface leakage which weakens the spark after a long period of service. Full Power Not Secured. Full power is not secured from the gasoline consumed. The engine becomes be-comes sluggish. Acceleration is slower. It lacks pull on the hills. The un-consumed un-consumed gasoline seeps by the pistons pis-tons nnd dilutes the oil In the crank case, affecting lubrication and many times causing serious injury to the working parts. This process Is so slow that the motorist rarely notices it. But the operation is actually about the same as driving with a partially retarded spark. The installation of a new set of spark plugs is actually 1 revelation to the motorists. The lifference in engine operation is so narked as to be unmistakable. Power md pickup are better. There is more ;peed. Engine operation is improved n every way. And the motorist ictually saves the cost of the new -park plugs in oil and gasoline in he first 1,200 to 1,500 miles of run-ling. |