One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. There are two electrodes separated by a small gap as the current approaches the end of one electrode, it effectively "jumps" across the gap to the opposite electrode and creates a visible spark. At the top end of the plug, the tips connect to the spark-plug wires and send an electrical current down the interior of the plug to the electrodes. Spark plugs are constructed of an insulating material and a metallic conductor. This process occurs thousands of times per minute, but for it all to work, the source of the sparks, the spark plugs, must fire consistently. The motor first mixes gasoline and air in small quantities and then ignites the mixture inside a cylinder with an electrical spark.Īs the hot gases from the explosion expand, they push a piston, which in turn is linked to a shaft that transfers power to the transmission and ultimately the wheels. The basic operation of an internal combustion engine, which describes your car's gasoline motor, is not particularly complex. Below is more information about spark plugs, how you can check them for proper adjustment and functioning, and how to know when it is time to replace them. Knowing more about their operation, maintenance and replacement is one key to making sure your engine runs well. Spark plugs are inside every gasoline car engine, but most vehicle owners know little about these small but vital engine parts.
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