document.writeln('<dl><dt><b>detonation</b></dt>');
document.writeln('<dd>Detonation is the result of the air/fuel mixture exploding in a');
document.writeln('<a href="/glossary.shtml#cylinder">cylinder</a>, after the');
document.writeln('<a href="/glossary.shtml#sparkplug">spark&nbsp;plug</a> has fired. It is');
document.writeln('normally caused by excess heat and/or pressure. The fuel should burn');
document.writeln('rapidly, not explode. When it explodes, the resulting metallic');
document.writeln('"ping" sound is a warning that something is wrong. Detonation should not be confused');
document.writeln('with <a href="/glossary.shtml#preignition">pre-ignition</a>, which occurs, as its');
document.writeln('name implies, <i>before</i> the');
document.writeln('<a href="/glossary.shtml#sparkplug">spark&nbsp;plug</a> has fired.<br>');
document.writeln('<font size=1><i>by Randy Hicks</i></font></dd></dl>');