Spark Plug Number Meaning: The Code on the Shell Is a Full Specification The letters and digits stamped on the side of a spark plug are not a serial number and not a random sales code. They form a compact engineering sp...

Laser Iridium vs Iridium IX: The Short Answer Standing in the auto parts aisle, two NGK iridium spark plugs look nearly identical. Both carry a fine iridium tip, both are designed for modern engines, and both are often ...

The Short Answer: What a Conventional Spark Plug Is and When It Is the Right Choice A conventional spark plug — also called a nickel-copper or copper-core plug — is the standard parts-catalog ignition component for engi...

The Main Spark Plug Families Modern engines generally run on five spark plug families: nickel-copper, single platinum, double platinum, single iridium, and double iridium. If you need a direct conclusion, iridium and do...

A spark plug wear chart tells you exactly one thing that matters most to an engine's health: how much of the electrode has eroded away and whether the gap has widened past the point where combustion stays reliable. As a...

Spark Plug Condition: The Direct Answer First A healthy spark plug condition shows a light tan or grayish-brown deposit on the insulator tip, a clean electrode with no excessive erosion, and a gap that matches the engin...

Indexing spark plugs means rotating the plug in the cylinder head so that the open side of the ground electrode faces the incoming air-fuel mixture or the center of the combustion chamber, rather than letting it fall wh...

Do You Need Anti-Seize on Spark Plugs? The Short Answer Most modern spark plugs do not need anti-seize compound, because the majority of plugs sold today already carry a factory-applied trivalent zinc or nickel platin...

Spark Plug Temp Range Explained: The Short Answer First A spark plug temp range, more commonly called the heat range, describes how quickly a spark plug can pull combustion heat away from its firing tip and transfer it...

Spark Plug Torque: The Exact Specs You Need Before You Touch a Wrench The correct spark plug torque spec for most passenger car engines is between 10 and 20 ft-lbs (14–27 Nm) when installing into an aluminum cylinder h...

A spark plug chart is the fastest way to confirm three things at once: the correct plug for an engine, the right gap setting, and the heat range the engine actually needs. Cross-referencing a chart against the engine's...

Anti Seize On Spark Plugs: The Direct Answer Most modern spark plugs do not need anti seize compound. Spark plug manufacturers apply trivalent zinc, nickel, or other corrosion-resistant plating directly to the plug thre...