NGK Racing Spark Plug 97537 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 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)

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

• Material: Platinum
• Type: Slant
• Quantity: 1

• 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.

• Brand: NGK/NTK
• Warranty: 1 Year
• MPN: R2558E-9