Gasoline engines generate power from the precision-timing combustion of a fuel-air mixture of gasoline and oxygen. However, gasoline itself is relatively difficult to ignite with the precision timing require for combustion of the fuel-air mixture, even at high temperatures. The role of the spark plug is to create a spark which ignites the fuel. Since the spark plug ignites conbustion, the performance of the plug determines the performance of the entire engine. The engine is ofter likened to the "heart of a vehicle" and spark plugs have the significant role as the "heart of the engine."
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