The Different Types Of Spark Plugs Explained
Manufacturers like NGK, Bosch, and Denso give their spark plugs different characteristics by manufacturing them from different materials. Although they all perform the same function, they were designed with different applications and engines in mind. These are the most common types of spark plugs you’ll see in modern vehicles.
Copper
For a long time, copper spark plugs were the industry standard, and the most common and affordable type of spark plug used. They get their name from their copper, nickel-coated inner core. The soft nature of copper and nickel means copper spark plugs have a short life-span due and are unsuitable for vehicles that use high-energy distributor based ignition systems. Nowadays, they’re typically found in older engines.
Platinum
As their name suggests, platinum spark plugs have a platinum center electrode. Platinum is a harder metal than copper which gives the spark plug greater longevity. They can operate efficiently at a wider temperature range and generate more heat than copper spark plugs which reduces carbon build-up.
Double Platinum
Single platinum spark plugs have a platinum center electrode, but double platinum spark plugs also use platinum on the ground electrode. They are pricier, but offer another step up in both performance and longevity.
Iridium
Iridium spark plugs are touted as the best plugs on the market. The ‘fine wire’ center conducts electricity very efficiently, and the small center electrode means less voltage is required for ignition. Iridium spark plugs are commonly found in high-performance engines.
Silver
Silver spark plugs are pretty uncommon unless you own an older European car or a motorcycle. The electrodes are silver coated which gives the plug the characteristics of better thermal conductivity, but poor longevity.
