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NGK Iridium Spark Plugs

NGK Iridium Spark Plugs

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From Hybrid Racing

  • Set of 4 spark plugs for K20A, K20Z, K24A, R18 and L15A engines
  • Iridium center electrode maintains gap for 60,000-80,000 miles vs 30,000-40,000 for nickel plugs
  • Fine wire 0.6mm iridium center electrode for easier, more reliable spark
  • Tapered cut ground electrode improves starting, idling and throttle response
  • Trivalent metal plating resists corrosion and seizing in aluminum heads
  • Direct factory replacement with same heat range, reach and thread pitch
Materials
Iridium alloy center electrode (0.6mm fine wire), tapered ground electrode, trivalent metal plating on threads
Fit
Direct replacement for OEM spark plugs; same heat range, reach and thread pitch; factory gap typically 0.044 inch for stock K series applications
Sizing
Sold individually; K series engines use 4 plugs, so order 4 for a complete set
Care
Check and adjust gap before installation; torque to 13 ft-lbs or hand-tighten with a spark plug socket until snug, then 1/16 turn more; do not over-tighten
Guarantee
Lifetime Replacement Guarantee: approved claims receive store credit for the original purchase price; you buy a replacement and return the original part, paying
Returns
Refund policy available on the store's Refund Policy page
Shipping
Free shipping eligibility depends on cart total; eligible shipping methods and destinations apply
Packs
Sold individually; order 4 for a complete set
In the box
(4) Spark Plugs

About the NGK Iridium Spark Plugs

• Set of 4 Spark Plugs

• Fits K20A, K20Z, K24A, R18, and L15A Engines

• Iridium Tip Ensures Consistent Spark

• Direct Factory Replacement Part

• Description

• Vehicle Fitment

• Included

NGK Iridium IX Spark Plugs - Honda/Acura K Series

You're doing a tune-up on your K series and you need spark plugs that'll actually last more than 30,000 miles without the gap opening up and causing misfires. Stock nickel plugs are cheap but they wear out fast. The center electrode erodes, the gap opens from 0.044 inch to 0.055 inch after 40,000 miles, and now your ignition system's struggling to jump that wider gap. You get misfires under load, rough idle, and poor fuel economy. NGK Iridium IX plugs use an iridium center electrode instead of nickel. Iridium's six times harder than platinum and it doesn't erode like nickel does. The plug maintains the factory gap for 60,000-80,000 miles instead of wearing out at 30,000. You're getting consistent spark, better throttle response, smoother idle, and you're not replacing plugs every two years. These fit K20 and K24 engines in your RSX, Civic Si, TSX, Accord, CR-V, and Element. They're a direct replacement for the stock plugs. Same heat range, same reach, same thread pitch. Pull the old plugs out, gap these to 0.044 inch, thread them in, and you're done.

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Here's Why Iridium Lasts Longer Than Nickel

Your stock spark plugs use a nickel alloy center electrode. Nickel's cheap and it works but it's soft. Every time the plug fires, a tiny amount of material erodes off the center electrode and the ground electrode. After 30,000 or 40,000 miles, enough material's worn away that the gap's opened up. Your plugs were gapped at 0.044 inch when they were new. Now they're at 0.050 or 0.055 inch. That wider gap requires more voltage to jump. Your ignition coils are working harder to fire the plugs. Eventually the coils can't generate enough voltage and you get misfires. Iridium's way harder than nickel. It erodes slower. An iridium plug maintains its gap two or three times longer than a nickel plug. You're getting 60,000-80,000 miles out of iridium plugs vs. 30,000-40,000 miles out of nickel plugs. That's fewer tune-ups and more consistent ignition performance over the life of the plug.

Fine Wire Center Electrode for Better Ignitability

NGK uses a fine wire iridium center electrode on these plugs. The electrode's 0.6mm in diameter. That's thinner than the nickel electrode on stock plugs. A thinner electrode concentrates the electrical energy into a smaller point. That makes it easier for the spark to jump the gap. You get more reliable ignition, especially on cold starts or when the engine's under load. The fine wire design also runs cooler than a thick electrode because there's less mass to heat up. That reduces the chance of pre-ignition or hot spots in the combustion chamber. The ground electrode's tapered. NGK cuts the ground electrode at an angle so the spark has a clean path to jump from the center electrode to the ground. That improves starting, idling, and throttle response. You'll notice the difference on cold mornings when the engine fires up faster and idles smoother.

Trivalent Metal Plating Prevents Seizing

NGK plates these plugs with trivalent metal plating. That's a corrosion-resistant and anti-seize coating on the threads. If you've ever tried to remove spark plugs that have been in the head for 60,000 miles and the threads are corroded, you know what a pain that is. The plugs seize in the threads and you're fighting to get them out without stripping the threads or breaking the plug. Trivalent plating prevents that. The coating keeps the threads from corroding and it acts as an anti-seize so the plugs come out clean when it's time to replace them. This is especially important on aluminum heads like the K series has. Aluminum's soft and the threads strip easily if the plug seizes.

Here's When You Use Iridium IX vs. Ruthenium HX

NGK makes two premium plug lines for performance applications: Iridium IX and Ruthenium HX. Iridium IX is the upgrade from stock nickel plugs. It's for stock engines, mildly modified engines, and street cars that see occasional spirited driving. If you're running a stock K20 or K24 with bolt-ons (intake, exhaust, tune), Iridium IX plugs are perfect. They last longer than stock plugs and they perform better. Ruthenium HX is the step up from Iridium IX. Ruthenium's even more durable than iridium and the plugs are designed for modified engines, turbo builds, and track use. If you're running a turbo K series making 300+ whp or you're tracking your car regularly, upgrade to Ruthenium HX. For most street cars and daily drivers with mild mods, Iridium IX is the right choice. You're getting way better durability than stock plugs without paying for features you don't need.

What You Get

• NGK Iridium IX spark plugs for K20/K24 engines

• Fine wire iridium center electrode (0.6mm diameter)

• Tapered cut ground electrode for improved ignitability

• Trivalent metal plating (anti-corrosion and anti-seize)

• Iridium alloy six times harder than platinum

• 60,000-80,000 mile service life (vs. 30,000-40,000 for stock nickel plugs)

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