NGK 5794 IFR7F-8DS Laser Iridium Spark Plug for 06-11 Civic 1.8L

Vehicle Fitment

• 2006-2011 Honda Civic, 1.8L I4

Fitment Notes

• OE cross-reference: Honda 98079-578BU
• Sold individually - the 1.8L I4 requires 4 plugs for a complete replacement

Features

• Precision laser-welded fine-wire iridium alloy center electrode for maximum spark energy and improved acceleration
• Platinum ground electrode promotes even wear and long service life, rated for approximately 80,000-100,000 miles
• Iridium's density (6x that of platinum) and high melting point suit modern high-efficiency engines
• High-grade alumina silicate ceramic insulator reduces risk of dielectric punch-through and improves heat transfer
• 98% pure copper core aids heat removal and prevents overheating
• Triple seals prevent leakage for extended plug life
• Corrugated ribs help prevent flashover
• Trivalent metal plating provides strong anti-corrosion and anti-seizing protection

Specifications

• NGK stock number: 5794
• Service/OE number: IFR7F-8DS
• Center electrode material: Copper core, iridium tip, fine wire
• Ground electrode: Nickel core, standard tip, 1 ground electrode
• Terminal type: Non-removable nut
• Thread diameter: 14mm
• Thread pitch: 1.25mm
• Hex size: 5/8 in. (16mm)
• Heat range: 7
• Pre-gap: 0.032 in.
• Reach: 0.75 in. (19mm)
• Resistance: Approx. 5,000 ohm
• Seat type: Flat/gasket
• Torque spec: 18-25.3 lb-ft (cast iron), 18-21.6 lb-ft (aluminum)

Included Components

• 1x Spark Plug

Product Description

The NGK 5794 (IFR7F-8DS) is a Laser Iridium spark plug engineered to OE specifications for the 2006-2011 Honda Civic's 1.8L engine, matching the factory 98079-578BU part number. Its precision laser-welded fine-wire iridium center electrode delivers strong spark energy for improved ignitability and acceleration compared to standard nickel plugs, while the platinum ground electrode is designed to hold up over a long service life - NGK rates these plugs for roughly 80,000 to 100,000 miles under normal use.

The high-grade alumina silicate ceramic insulator reduces the risk of dielectric punch-through (spark exiting through the side of the plug instead of the tip) and improves heat transfer, while the copper core helps manage heat buildup during sustained driving. Triple seals and corrugated ribs round out the design, protecting against leakage and flashover respectively.

This is a solid OE-quality replacement for 8th-generation Civic owners doing a routine ignition tune-up or addressing a misfire. Since the Civic's 1.8L is a 4-cylinder engine, a full replacement will need 4 plugs - this listing is for a single plug.