Sparkplugs spark away millions of times throughout their life cycle, yet get little attention. Their spark ignites the mixture in the combustion chamber, and the quality of that spark determines just how effectively that mixture combusts. While sparkplugs are simple devices, there’s lots you should know about how they work, and what you do know might help you decide what kind of plugs to get when it’s time to replace them.
A sparkplug has three main components: a threaded