What Is Iridium Spark Plug – Pros & Cons

Spark plugs play an important function in igniting the fuel-air combination in an engine. And, if you want extraordinary performance and longevity, the iridium spark plug is a great choice. This high-performance wonder, often described as the gold standard in spark plug technology, exploits the unique qualities of iridium metal to produce exceptional longevity and efficiency. But just what is iridium spark plug? What distinguishes it from normal spark plugs? And why should you think about upgrading to this modern ignition system? In this post, we will dig into the intriguing world of iridium spark plugs and investigate their advantages for both ordinary drivers and automotive aficionados.

What is the Iridium Spark Plug

How Do Iridium Spark Plugs Work? Spark plugs made of iridium are a novel kind that has gained popularity recently. Their exceptional durability and long lifespan have made them renowned among car professionals and enthusiasts. The chemical utilized to make the uncommon metal that makes up the spark plug’s center electrode is what gives iridium its name.

What Do Iridium Spark Plugs Do

The capacity of iridium spark plugs to withstand high temperatures and voltage levels sets them apart from regular copper or platinum plugs. They thereby ignite the air-fuel mixture inside the combustion chamber with remarkable efficiency, improving both fuel economy and engine performance. Because they need to be changed less frequently than other types, iridium spark plugs also require less upkeep.

One intriguing detail of iridium spark plugs is their impact on the ignition device era. Because of their tiny electrode size (typically about 0.6mm), these plugs provide quicker and extra consistent sparking, resulting in smoother electricity delivery and much less carbon accumulation in the engine. Furthermore, their progressed conductivity gives reliable ignition even in excessive situations including cold starts or high-strain settings.

How Much Iridium is in a Spark Plug

How much iridium is there in these tiny but potent engine components? So get ready to be amazed. Just 0.6 to 1 gram of iridium, on average, can be found in a standard spark plug. A gram of iridium is around the size of a sugar cube, to put this into perspective. Even though it is minuscule, this iridium contributes significantly to the engine’s ability to ignite and burn fuel effectively.

How to Gap Iridium Spark Plug

Tools you will require

  • Feeler Gauge
  • Spark plug socket
  • Torque wrench
  • Gap tool
  • Pliers or Flathead Screwdriver

Before you begin gapping an iridium spark plug, make sure you have the necessary tools.

A set of feeler gauges in diameters ranging from 0.025 to 0.032 inches will be necessary.

Selecting a wire gauge that meets the specifications provided by your car’s manufacturer is the first step toward optimal performance.

Holding it firmly in place with pliers or a special spark plug gripping tool, gently bend the electrode (the metal tip) open or close to the appropriate measurement.

Related:- What Happens If A Spark Plug Gap Is Too Small?

Advantages of Iridium Spark Plugs

1. Longevity

Spark plugs made of iridium last a lot longer than those made of conventional copper or platinum. The central electrode’s iridium metal is incredibly robust and can tolerate extreme temperatures and continuous use without corroding. Over time, this leads to fewer replacements, saving you money and hassle.

2. Improved Performance

Due to their distinctive shape, iridium spark plugs offer improved ignition capabilities. The accurate and effective igniting of the air-fuel mixture is made possible by the fine electrode tip’s ability to create a smaller spark gap. As a result, the engine runs more smoothly, consumes less gasoline, and produces more horsepower.

3. Increased Durability

Iridium spark plugs are an excellent option for engines that operate at high RPMs or under heavy loads because they are highly resistant to wear and tear brought on by extreme engine conditions.

4. Fuel Efficiency

It helps in enhancing fuel combustion in the engine cylinders with their exceptional igniting characteristics. They support improved fuel efficiency and lower emissions by guaranteeing full combustion of the air-fuel mixture.

5. More Stable Idling

It also offers more stability when idling, which is another benefit. Your car’s engine will be able to sustain its idle speed more successfully thanks to its continuous spark delivery, even at low speeds.

Disadvantages of Iridium Spark Plugs

1. Expensive

Iridium spark plugs are significantly more expensive than conventional copper or platinum spark plugs. This implies that you may have to spend a lot more money if you need to replace every spark plug in your car’s engine. This can be a big negative for consumers who are on a tight budget.

2. Prone to fouling

Compared to other spark plug varieties, they are more prone to fouling. When deposits accumulate on the electrode of the plug, fouling happens, which can lead to subpar performance and even engine misfires. Iridium is more resistant to fouling than its equivalents even though it can sustain higher temperatures.

3. Reduced performance in older vehicles

It’s possible that older cars with less sophisticated ignition systems won’t be able to take full advantage of the advantages of these spark plugs. Because of this, they might not offer as much performance increase as they would in more recent models.

4. Limited gap adjustability

For better ignitability, the fine wire electrode used in iridium spark plugs is intentionally made with a small diameter. However, due to their small size, there is little room for manual gap adjustment when installing them in some engines that demand particular spacing for optimum performance. This lack of adaptability might bother some engine tuners.

Iridium spark plugs vs platinum

Iridium is an extraordinary metallic that is used to make spark plugs and is renowned for both its excessive melting point and persistence. They have thinner electrodes, which could produce greater centered sparks with extra accuracy for higher combustion. Power output and gasoline performance both rise as a result.

A platinum-tipped core electrode provides excellent wear resistance in platinum spark plugs. Moreover, platinum can function for an extended period and has a high level of corrosion resistance.

Platinum spark plugs tend to have a shorter lifespan than iridium ones. Whereas iridium plugs can last up to 100,000 miles, platinum plugs usually need to be changed after 60,000 miles.

Conclusion: Why Iridium Spark Plugs are Superior

Finally, iridium spark plugs have certain benefits over other types of spark plugs. Because of their durability and lifespan, they are a cost-effective option for car owners. Iridium’s greater conductivity enables efficient and consistent ignition, resulting in enhanced fuel efficiency and engine performance. Furthermore, the fine-tipped shape of iridium spark plugs improves combustion and lowers pollutants. With all of these advantages, it is evident that iridium spark plugs are the preferable choice for anybody looking for the best engine performance and lifespan. Make the switch to iridium spark plugs today and see the difference for yourself!


1. Why should I choose iridium spark plugs?

Iridium spark plugs offer several advantages over traditional copper or platinum spark plugs, including improved engine performance, increased fuel efficiency, and longer lifespan.

2. How do iridium spark plugs enhance engine performance?

Due to their fine center electrode design, iridium spark plugs provide better ignition and combustion efficiency, resulting in smoother acceleration, reduced misfires, and enhanced power delivery.

3. Can I install iridium spark plugs myself, or should I seek professional help?

While it is possible to install iridium spark plugs yourself if you have the necessary tools and experience, it’s generally recommended to seek professional help. Certified mechanics can ensure proper installation, gap adjustment, and overall engine performance optimization.

4. Do I need to remove spark plug wires when switching to iridium spark plugs?

In most cases, you don’t need to replace your existing spark plug wires when switching to iridium spark plugs. However, it is recommended to inspect the condition of your wires and replace them if needed for optimal performance.

5. Can I install iridium spark plugs on any vehicle?

Yes, iridium spark plugs are designed to fit a wide range of vehicles. However, it’s important to check the manufacturer’s specifications or consult with a professional mechanic to ensure compatibility with your specific make and model.

6. How often do I need to replace iridium spark plugs?

Iridium spark plugs typically have a longer lifespan compared to other types of spark plugs. While the exact replacement interval may vary depending on driving conditions and manufacturer recommendations, they can last up to 100,000 miles or more before needing replacement.

7. Do iridium spark plugs need anti-seize

No, With iridium spark plugs, anti-seize is not necessary.

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