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Spark Plugs VS Electric Heat Plugs

Jul. 15, 2021

Understanding the difference between spark plugs and electric plugs can be difficult if you're not familiar with basic car parts. While you may think that these two components are similar, in reality, they are completely different. Spark plugs are used in gas engines, while electric heat plugs are used in diesel engines. These two components are also used for completely different purposes.

 

To make this concept a little less confusing, let's take a closer look at the differences between spark plugs and electric heat plugs.

Spark Plugs

What is a spark plug?

Spark plugs are used in gas powered internal combustion engines. Typically, there is one spark plug for each cylinder of the engine. Each spark plug has a metal body, a ceramic insulator, an internal resistor and a pair of electrodes. The spark plug wire or ignition coil is connected to the end of the spark plug. The other end of the plug extends into the combustion chamber of the engine

Spark Plug

 Spark Plug

The high voltage from the car's ignition system is transmitted to the terminal of each spark plug. From there, the voltage passes through the internal resistance of the spark plug before reaching the electrodes at the tip. The voltage then jumps across the gap between the electrodes, creating an electric arc that ignites the engine's air-fuel mixture.

 

The resulting explosion forces the piston in the cylinder downward, causing the engine crankshaft to rotate. As the crankshaft turns, it generates the rotational force needed to propel the vehicle.

How often to replace spark plugs?

There are three main types of spark plugs - copper, platinum and iridium - each with a different life expectancy.

 

Copper plugs have a copper center electrode covered with a nickel alloy. The design typically lasts about 30,000 miles.

Platinum plugs have a platinum disk at the tip of the center electrode. There are also so-called double-platinum plugs that have platinum at both ends. Because platinum is more durable than nickel alloys, platinum plugs last longer than copper plugs. You can expect to replace a set of platinum plugs every 90,000 to 100,000 miles.

 

Iridium plugs with fine electrodes made of iridium are becoming more popular. Because iridium is harder than platinum, it lasts longer, allowing this type of plug to be used for up to 120,000 miles.

 

To determine when to replace the plugs, you will need to consult the vehicle manufacturer's maintenance schedule. You can find this information in the owner's manual or in the supplemental service manual.

 Spark Plug

 Spark Plug

Electric Heating Plugs

What is an electric heater plug?

Electric glow plugs are used in diesel-powered internal combustion engines. Spark plugs ignite the engine's air-fuel mixture while the vehicle is running, while electric plugs act as a starting aid to get the engine running.

 

Diesel engines rely on the heat generated by air compression to ignite the fuel, which makes them difficult to start when it is cold. Many diesel-powered vehicles use electric heat plugs to solve this problem. Electric heat plugs act as heating elements to preheat the air in the combustion chamber, making it easier to start the vehicle. Diesel engines typically have one heater plug per cylinder.

 

Each plug has a terminal, a threaded body and a tip that extends into the engine's combustion chamber. Applying voltage to the end of the plug allows current to pass through the heating element in the tip of the plug. The body of the plug screws into the cylinder head and acts as an electrical ground for the heating element.

How often to replace electric heating plugs?

Unlike spark plugs, there is no recommended maintenance schedule for electric heating plugs. Electric heating plugs only need to be replaced when they fail or wear out.

 

 


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