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Show 1W SPARK PLUG IS MONEY SAVER Small Investment at Proper Time Helps Make Larger Outlay Unnecessary. Exhaustive tests by automotive engineers engi-neers prove that motor car owners many times are compelled to spend -considerable money to have their engines en-gines overhauled, and new parts put In, to overcome operating difficulties that could have been obviated harl a new set of spark plugs been installed at the proper time. More than 2,000 tests reveal that -a complete new set of spark plugs at the end of each 10.000 miles of driving, driv-ing, or at least once a year, Is actual dollars and cents economy. These tests have definitely shown that the saving in oil and gasoline alone, with flow spark plugs, more than pays their cost within a few months, in addition to insuring greater general operating efficiency. Change Plugs Regularly. Motor car manufacturers, a few years ago, boasted of the long life of spark ' plugs. Toilay they are recom-fcnding recom-fcnding in their instruction hooks that owners change their plugs regularly, even though spark plugs have boen vastly improved In recent years. It was formerly believed that a spark plug was giving elfieient service i so long as it continued to fire regu- j larly. The engineering tests supplied overwhelming evidence that this was Incorrect The greater stress on spark plugs, caused by a combination of poorer gasoline nnd higher compression compres-sion engines, saps their efficiency rapidly. rap-idly. To secure full power from gasoline It is vital that the gas mixture in the ; cylinders he burned with tremendous ! rapidity. New spark plugs provide a u(liciently hot spark to accomplish this, despite the poorer quality of present-day fuels. Causes Leakage, Under this tremendous stress the electrodes become pitted. Carbon Is burned on to the insulator and the shell. This causes a leakage of part of the current supplied from the battery, bat-tery, reducing the spark's Intensity. Full power Is not extracted from tiie gas mixture. Much good gasoline Is wasted by passing out the exhaust The longer the old spark plugs are permitted to remain In the cylinders the more vicious becomes the circle of poorer combustion, crankcase dilution dilu-tion and pitting of pistons nnd cylinder cylin-der walls. That Is why manufacturers recommend recom-mend that car owners install new spark plugs at regular Intervals. To do so restores power and speed. In less than a year's average running there Is a distinct loss which Impairs engine performance. . Then the owner may be faced with a hill for considerable consider-able repair work which could probably have been oliated had be renewed his spark plugs at the proper time. |