What Do Spark Plugs Do?

Part of the Video Series Changing Spark Plugs

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The purpose of spark plugs in a car. Learn the function of spark plugs in this free online instructional video on how to change a spark plug in the engine of your car.

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Video Transcript

What Do Spark Plugs Do?
Hi my name is John, on behalf of Expertvillage.com. In this video clip I will explain what spark plugs actually do. As we take a look at this engine cut away there is a couple of things I wanted to point out, right here we have the piston and we have our spark plug at the top and inside here would be our combustion chamber. Now, the spark plug has two primary functions, the first one is to ignite the air-fuel mixture that would be in our combustion chamber and the second part would be to transfer heat from the combustion chamber, so as the air-fuel mixture explodes, the heat is transferred from the combustion chamber through the spark plug and into the engine block. It is important to remember that plugs do not create heat, they just remove the heat.

About the Expert

Expert: Jon Olson holds a Bachelors of Science in Education and Human Sciences degree, with an endorsement in Industrial Technology Education from the University of Nebraska in Lincoln. Read More