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The fundamental design of this new generation of spark plugs retains the proven features used in Denso's OE products and combines a revolutionary Iridium alloy with laser welding technology that allows Denso to harness the power of Iridium. Using Iridium, which is six times harder and eight times stronger than platinum, the tip can be shrunk to only 0.4mm. This means the voltage requirements are decreased while firing performance is greatly improved. A U-Groove has been cut inside the ground electrode to maintain the large volume of space required to form the nucleus of a flame. While still keeping the required voltage low, this technology enables excellent firing performance without increasing the spark gap. The tip of the ground electrode has been cut to form a taper. This greatly improves firing performance by reducing quenching. The extreme hardness and high melting point of Iridium prevented the use of this incredible metal until Denso perfected the Laser Welding Process, which provides a 360° seal so reliable the electrode resists wear even in the harshest conditions.
Heat Range
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Cold
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14mm Thread x .460'' Reach 5/8'' Hex Projected Tip Tapered Seat
ITF-Series plugs have a 1.5mm insulator projection for better ignitability in older domestic applications.
14mm Thread x .708'' Reach 5/8'' Hex Projected Tip Tapered Seat
IT-Series plugs have a 1.5mm insulator projection for increased performance, while the -0.5mm projection offers better heat resistance, in newer domestic applications.
14mm Thread x .708'' Reach 5/8'' Hex Projected Tip Tapered Seat IT-Series plugs have a 1.5mm insulator projection for increased performance, while the -0.5mm projection offers better heat resistance, in newer domestic applications.
14mm Thread x 19mm Reach 13/16'' Hex Projected Tip Gasket Seat
IW-Series plugs have either a porcelain projection of 1.5mm for better ignition or a -0.5mm projection for better heat resistance.
14mm Thread x 19mm Reach 16mm Hex Projected Tip Gasket Seat
IQ-Series plugs are 1/8'' longer than the IK plugs between the top of the hex and top of the terminal.
14mm Thread x 25mm Reach 16mm Hex Projected Tip Tapered Seat
ITV-Series plugs are designed specifically for newer 4 and 6 cylinder domestic applications and offer colder than stock heat ranges for performance applications.
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