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Are DENSO spark plugs iridium?

Yes, DENSO spark plugs are iridium. Iridium is a rare and durable precious metal that DENSO uses in the production of its high-performance spark plugs. Iridium spark plugs offer several advantages over traditional spark plugs, including improved ignitability, longer service life, and enhanced engine performance.

What are Iridium Spark Plugs?

Iridium spark plugs are a type of spark plug that uses iridium, a rare and highly durable precious metal, as the electrode material. Iridium is known for its exceptional hardness, corrosion resistance, and high melting point, making it an ideal material for spark plug electrodes.

Compared to traditional spark plugs that use copper or nickel alloy electrodes, iridium spark plugs offer several key benefits:

Improved Ignitability: The small, fine-tipped iridium electrodes can more easily ignite the air-fuel mixture in the engine cylinder, leading to improved combustion and better engine performance.

Longer Service Life: Iridium is an extremely durable material that can withstand the high temperatures and pressures inside the engine cylinder. Iridium spark plugs typically last much longer than traditional spark plugs before needing replacement.

Enhanced Engine Performance: The improved ignitability and longer service life of iridium spark plugs can contribute to better fuel efficiency, increased horsepower, and smoother engine operation.

These advantages make iridium spark plugs a popular choice for many modern, high-performance engines, including those found in DENSO's product lineup.

DENSO's Iridium Spark Plugs

DENSO is a leading manufacturer of automotive components, including spark plugs. The company has developed a range of iridium spark plugs that leverage the unique properties of this rare metal to deliver superior performance and durability.

DENSO's iridium spark plugs feature a fine-tipped, platinum-enhanced iridium center electrode and a nickel-chromium alloy ground electrode. This design, combined with DENSO's advanced manufacturing processes, results in spark plugs that can withstand the demanding conditions of modern engines while providing improved ignitability and extended service life.

DENSO's iridium spark plugs are widely used in a variety of vehicle applications, from passenger cars to high-performance motorcycles and off-road vehicles. They are known for their reliability, efficiency, and ability to enhance engine performance.

Does DENSO make iridium spark plugs?

Denso Iridium Power spark plugs feature a 0.4mm iridium tipped laser welded fine wire center electrode that reduces required voltage and improves firing performance. Tapered cut U-Groove ground electrode increases ignitability and decreases quenching.

How to tell if a spark plug is iridium?

This one seems to arch over a little bit more than the real NGK spark plug. So the danger of installing one of these fake NGK spark plug in your vehicle.

Which is better, DENSO or NGK iridium spark plugs?

The main difference is that Denso Iridium plugs are designed for maximum performance and efficiency with a very fine electrode, while NGK Iridium plugs are often a more balanced, longer-lasting standard replacement option. Denso may be better for demanding applications or those prioritizing fuel economy and a strong spark, while NGK is a popular choice for reliable performance and durability. Ultimately, the best choice depends on your vehicle's specific needs and performance goals.

This video compares the electrode designs of NGK and Denso spark plugs: 55sBULLI KIDYouTube · Jan 18, 2021
Denso Iridium

Design focus: Maximum spark efficiency and performance due to an extremely fine, highly concentrated iridium electrode.
Best for: Daily driving, fuel efficiency, hybrid vehicles, and situations requiring a very strong spark, especially in high-compression or turbocharged engines.
Performance characteristics: Can result in better fuel economy and a more responsive feel.
Potential drawback: The smaller electrode may theoretically have a shorter lifespan than NGK iridium plugs under extreme stress, though both are still durable.

NGK Iridium

Design focus: A balance of performance and long-lasting durability.
Best for: Standard replacement in most vehicles, performance tuning, and demanding conditions where longevity is a priority.
Performance characteristics: Offers consistent and stable performance over a long period.
Potential drawback: While durable, the electrode is slightly thicker than Denso's, so it may not create as powerful of a spark under all conditions.

You can watch this video to see a direct comparison of NGK and Denso spark plugs: 56sJohnny AvantiYouTube · May 3, 2024
How to choose

For maximum performance and efficiency: Choose Denso, especially if your vehicle is turbocharged or has high compression.
For a reliable, long-lasting replacement: Choose NGK for a durable and consistent performance upgrade.
Consider the price: Denso iridium plugs are sometimes more expensive, so if price is a major factor, NGK might be the better value.
Check your vehicle's manufacturer recommendation: The most important factor is to ensure the new spark plugs meet the specifications recommended by your car's manufacturer for optimal combustion and performance.

Does Toyota use NGK or DENSO?

Popular Toyota Models And Recommended Spark Plugs
For the Corolla, NGK Iridium IX or Denso Iridium TT are recommended. These spark plugs enhance ignition efficiency and deliver fuel savings, making them ideal for daily commuting.

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.