NGK - Racing Plug - R2558E-9 (97537)

NGK Racing Series plugs are engineered to withstand the harshest engine conditions. Fine wire iridium tipped center electrode and platinum tipped ground electrode improve ignitability, increase durability and enhance anti fouling capabilities. Special insulator nose configurations improve throttle response. 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.

Product Specifications

Shell

• Thread Diameter - 12mm
• Thread Pitch - 1.25mm
• Seat Type - Gasket
• Reach - 26.5mm (1.04")
• Hex Size - 9/16" (14mm)
• Terminal Type - Solid
• Gap - .028" (0.7mm)

Center Electrode

• Material - Iridium
• Type - Fine Wire
• Size - 1.0mm
• Projection - Recessed

Ground Electrode

• Material - Platinum
• Type - Slant
• Quantity - 1

Specifications

• Resistor - Yes
• Resistor Value - 5k Ohm
• Heat Range - 9
• Torque Specs - Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.