More Information for NGK 91121
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NGK 91121  
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NGK 91121 Specifications
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialIridium
Electrical Terminal TypeNon-Removable Nut
Gap Size (IN).028
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel
Ground Electrode Quantity1
Ground Electrode Tip DesignStandard
Hex Size (MM)14
Insulator Height (mm)51.00
Manufacturer Heat Range7
Part NumberILKAR7J7G
Reach (mm)26.5
Resistance (ohms)5000
Resistor TypeYes
Seat TypeFlat
Stock Number91121
Thread Diameter (MM)12.00
Laser Iridium; Pre-Set Gap: 0.028"
Features & Benefits:
  • Platinum disc welded to backside of ground electrode provides long life
  • Trivalent Metal Plating for superior anti-corrosion and anti-seizing
  • Tapered ground electrode to minimize quenching
  • Consistent and stable spark
  • Faster starts and quicker acceleration
  • Better fuel economy and lower emissions
Which NGK Spark Plug Is Right For You?

Material / Series Lifespan / Durability Performance / Ignitability Efficiency / Fuel Economy
Copper / Nickel V-Power
Platinum G-Power
★★ ★★★★
Double Platinum Laser
Double Platinum
★★★★★ ★★ ★★
Iridium IX
Iridium IX
★★★ ★★★★★ ★★
Iridium Laser
Iridium Laser
★★★★★★ ★★★★ ★★★
Ruthenium HX
★★★★★★★ ★★★★★ ★★★★

Check, Set & Adjust Spark Plug Gaps

Alternate/OEM Part Number(s): ILKAR7J7G

Warranty Information:
60 Days