NGK 2815 TR4GP G-Power Platinum Spark Plug 14mm Heat Range 4

The NGK 2815 (TR4GP) G-Power Platinum Spark Plug has a fine wire platinum center electrode and a trapezoidal cut ground electrode. It gives you the benefits of platinum at a moderate cost. It is a common upgrade from standard nickel alloy plugs, and a lower cost alternative to double precious metal plugs. NGK is a leading original equipment spark plug supplier.

Key Features:

• 0.6 mm laser-welded platinum tip on the center electrode lowers the voltage needed to fire. This supports quicker starts, better acceleration and improved fuel economy.
• Trapezoidal cut ground electrode reduces quenching for better ignitability.
• Solid copper core helps with heat dissipation and conductivity.
• Trivalent metal plating resists corrosion and seizing.
• Corrugated insulator ribs help prevent flashover.
• Triple gasket seal helps prevent combustion gas leakage.
• Cold-rolled threads help prevent cross-threading.

Specifications:

• Manufacturer part number: TR4GP (NGK stock number 2815)
• Heat range: 4
• Thread size: 14 mm, 1.25 mm pitch
• Reach: 17.5 mm
• Hex size: 5/8 in. (16 mm)
• Seat type: Tapered (gasket seat)
• Gap: 0.040 in. (1.0 mm) pre-set
• Center electrode: Platinum fine wire, projected insulator nose
• Ground electrode: Nickel, trapezoid cut, 1 electrode
• Resistor: Yes, 5k ohm
• Terminal: Solid, non-removable nut
• Torque: 10.8-18 lb-ft in cast iron heads, 7.2-14.5 lb-ft in aluminum heads

This resistor-type platinum plug helps reduce radio interference. It is suited to applications that originally used nickel alloy spark plugs.