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Message: <blockquote data-quote="Shinneryfarmer" data-source="post: 3852026" data-attributes="member: 46291"><p>A larger gap will provide more efficient combustion provided all is perfect. Not to be misunderstood I stated as that as gap increases the coil may not have sufficient voltage to maintain a hot spark thus reducing efficient combustion. At some point the gap becomes to wide for the coil to overcome for sufficient spark. I have seen this in as little as .005 when the gap spec is .060 on older engines. Reduce gap to .045 or.050 and issue is resolved. When auto manufacturers set specs for numerous things that is in a new engine under perfect conditions. They do not take into account every aspect of conditions that happen over time. Wear on mechanical parts, weakening of coils and other electrical components. The specs they set on a new engine may not be as efficient on a engine that has 100k on it for these various reasons.</p></blockquote><p></p>