Spark plug with grooved, tapered center electrode

Spark plug with ground electrode having diverging prongs

Spark plug with ground electrode having mechanically locked...

Spark plug with heat conducting sleeve for center electrode

Spark plug with high capability to ignite air-fuel mixture

Spark plug with high insulation properties and high...

Spark plug with hot/sharp ground electrode

Spark plug with igniting portion chip composition

Spark plug with improved noble metal chip

Spark plug with inclined electrode spark surfaces

Spark plug with increased durability and carbon fouling...

Spark plug with increased durability and carbon fouling...

Spark plug with increased pressure resistance

Spark plug with Ir-alloy chip

Spark plug with iridium-based alloy chip

Spark plug with iridium-rhodium alloy discharge portion

Spark plug with low erosion electrode tip

Spark plug with lower operating temperature

Spark plug with marking layer composition

Spark plug with multi-layer firing tip