NGK 5691 BCPR7EIX-11 Iridium IX Spark Plug, Heat Range 7, 1.1mm Gap

The NGK 5691 Iridium IX spark plug (BCPR7EIX-11) is built for drivers who want sharper throttle response, better acceleration and long service life. It has a fine-wire iridium center electrode and a taper-cut ground electrode. Together they give a stable spark and strong ignitability in modern, high-output engines. It can be used as an OE replacement or as a performance upgrade.

Key Features:

• Fine-wire iridium center electrode: iridium has a very high melting point, which gives durability and a consistently stable spark.
• Taper-cut ground electrode: gives the flame kernel more room to expand, for faster, more complete combustion.
• Trivalent metal plating: resists corrosion and prevents seizing in the cylinder head.
• Copper core: helps remove heat from the tip and supports a wide heat range.
• Ceramic insulator with corrugated ribs: the alumina silicate insulator gives strength and heat transfer, and the ribs help prevent flashover.
• Triple seals: prevent combustion gas leakage.
• Resistor design: 5k ohm resistance helps suppress radio-frequency interference.

Specifications:

• NGK part number: 5691
• NGK plug number: BCPR7EIX-11
• Heat range: 7
• Thread size: M14 x 1.25
• Reach: 19mm (3/4 in)
• Hex size: 16mm (5/8 in)
• Seat type: Gasket (crush washer)
• Pre-set gap: 0.044 in (1.1mm)
• Center electrode: Iridium, fine wire, 0.6mm
• Ground electrode: Nickel, taper cut
• Terminal: Solid, non-removable
• Resistor: Yes, 5k ohm
• Insulator height: 53mm (2.09 in)
• Torque, cast iron head: 18-25.3 lb-ft
• Torque, aluminum head: 18-21.6 lb-ft

Interchange part numbers include Honda 98079-5714F and DENSO 3257, 5313, IQ22, Q22PR-U11 and Q22PR-P11. Check the pre-set gap against your engine's specification before installing, and set it as needed.