NGK 3691 TR8IX Iridium IX Spark Plug

Part #: TR8IX 3691

NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high performance engines.

Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
Corrugated ribs prevent flashover
Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
Copper core aids in heat removal
Triple seals prevent leakage

Shell:

Thread Diameter: 14mm
Thread Pitch: 1.25mm
Seat Type: Tapered
Reach: 18mm (.709")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .039" (1.0mm)

Center Electrode:

Material: Iridium
Type: Fine Wire
Size: 0.6mm
Projection: Projected

Ground Electrode:

Material: Nickel
Type: Standard
Shape: Taper Cut
Quantity: 1

Specifications:

Resistor: Yes
Resistor Value: 5k Ohm
Heat Range: 8
Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 7.2-14.5 lb. ft.

In Store Pickup: Anaheim, CA, USA

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NGK 3691 TR8IX Iridium IX Spark Plug

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