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Page 20 · column 3 of 4 · from the scan, no model involved
Some drivers may still remember when a car’s engine needed a complete tune-up every 10,000 miles, but those times have changed. Today, there are several models being advertised as needing a “tune-up” every 100,000 miles. The. claims may lead you to ask a couple of questions. First, is this boast true? Secondly, if it is, ho\V is that possible?
Car manufacturers can claim 100,000mile tune-up intervals for a number of reasons involving spark plugs.
“For one thing, some people believe that a tune-up has evolved to only mean a spark plug change.
.Also, sophisticated engine designs with extremely precise fuel-injection systems are less likely to foul spark plugs, leaded gasoline isn’t available and we’re making better spark plugs.
Coping Under Fire
A lot has changed in spark plug design since the days of the 10,000-mile plug change.
Engineers realized some time ago was the necessity of conducting heat away from the spark plug’s tips. Since copper is a great conductor of heat, better spark plugs have used copper cores in their center electrodes for years.
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