1. How do Iridium Spark Plugs differ from regular spark plugs?
Most spark plugs are copper core spark plugs, meaning they have a copper core. Regular spark plugs have a copper center electrode with a nickel alloy coating on the surface.
On the other hand, iridium spark plugs have an iridium tip on the center electrode. Dual iridium spark plugs also have a coating on the ground electrode.
The iridium electrode inlay is more durable and has a higher melting point, which helps extend the life of the spark plug. It also provides better performance and fuel efficiency than regular spark plugs.
In addition, while conventional spark plugs or copper plugs have a lifespan of 20,000 to 30,000 miles, iridium spark plugs can last 100,000 miles or more before they need to be replaced.
2. What other materials are used in spark plugs?
Regular plugs generally have a copper core center electrode with different metal coatings to prevent wear.
With modern engines having higher compression ratios, copper spark plugs (nickel alloy electrodes) are often installed as original equipment, but this traditional spark plug has a low melting point and wears quickly.
Platinum spark plugs are another common spark plug. Platinum is harder than copper or nickel alloys, which helps reduce spark plug wear caused by high voltage.
There are two versions of platinum spark plugs - single platinum and double platinum.
Single platinum spark plugs have a platinum coating on the center electrode only. Double platinum spark plugs have a platinum disc on both the ground and center electrodes.
Double platinum spark plugs (and double iridium spark plugs) are generally recommended for waste spark distributor ignition systems.
3. What is the difference between iridium and platinum plugs?
Iridium is six times harder and eight times stronger than platinum. It also has a melting point 700°F higher than platinum. As a result, iridium spark plugs last 25% longer (up to 120,000 miles) than platinum spark plugs (up to 100,000 miles).
Iridium spark plugs have a finer electrode inlay that produces a more focused spark. As a result, it provides a better quality flame and burns more efficiently than platinum spark plugs.
However, since iridium is a rarer and more precious metal than platinum, these plugs are more expensive.
4. What is the best spark plug material for my vehicle?
Ideally, you should check your owner's manual to determine the recommended type of spark plug.
Consult a professional mechanic or ignition expert to determine if you can upgrade to iridium spark plugs. You can also choose dual iridium spark plugs.
Manufacturers such as NGK, Denso, Champion or Autolite offer a variety of technologies. For example, you can choose a more specialized NGK iridium spark plug, such as Iridium IX or Laser Iridium, for superior ignition and better performance.
