Denso Spark Plug

Insulator - The insulators are made of a highly purified alumina powder, which gives exceptional dielectric strength and thermal conductivity at high temperatures, as well as greater physical strength. Five-Rib Design - The five-rib design prevents flashover and decreases voltage loss. Copper-Glass Seal - A special mixture of copper and glass powder bonds the center electrode and insulator together for a gas-tight seal. Proper heat is maintained and hot combustion gases are excluded. Copper-Cored Center Electrode - A special center electrode incorporates copper into the core of the nickel chrome binary alloy. This gives superior thermal conductivity and increases the operating range. U-Groove Ground Electrode - This U-Groove allows the spark to fill the gap formed by the U. This ball of fire develops a larger and hotter flash front so combustion is more complete.

Crushed Spark   Spark Fills the U-Groove

The flat ground electrode design of ordinary spark plugs crushes the spark and inhibits its growth. The patented U-Groove design traps the gas and produces a larger spark allowing for perfect combustion. Erratic starts caused by poor fuel mixtures and excessive fouling can be virtually eliminated by this simple but efficient U-Groove feature.

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