NGK Racing Spark Plug – R2558E-9

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.

• Shell
• Thread Diameter12mm
• Thread Pitch1.25mm
• Seat TypeGasket
• Reach26.5mm (1.04″)
• Hex Size9/16″ (14mm)
• Terminal TypeSolid
• Gap.028″ (0.7mm)

• Center Electrode
• MaterialIridium
• TypeFine Wire
• Size1.0mm
• ProjectionRecessed

• Ground Electrode
• MaterialPlatinum
• TypeSlant
• Quantity1

• Specifications
• ResistorYes
• Resistor Value5k Ohm
• Heat Range9
• Torque SpecsCast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.

• Part Information
• BrandNGK/NTK