Description
The Denso K20PSR-B8 Iridium Long Life Spark Plug is a premium OE-style replacement spark plug engineered for reliable ignition performance, long service life, and consistent combustion efficiency. Designed with a 0.7 mm laser-welded fine-wire iridium center electrode and a platinum ground electrode, this plug delivers strong ignitability, dependable durability, and stable performance in demanding automotive applications.
Factory-installed on select vehicles by major automakers, Denso Iridium Long Life spark plugs are built to meet high standards for quality and longevity. The fine-wire iridium center electrode helps improve spark concentration and firing efficiency, while the platinum ground electrode enhances wear resistance for extended operation. Machine-rolled threads help reduce the chance of seizing or cross-threading during installation and removal, and the purified alumina powder insulator provides exceptional strength and thermal conductivity. A copper-glass seal bonds the center electrode and insulator for a gas-tight seal, helping maintain long-term reliability.
This spark plug is a strong choice for drivers seeking premium replacement performance in compatible Mitsubishi applications.
Features
- Part number: 3431
- Plug type: K20PSR-B8
- Denso Iridium Long Life spark plug
- Premium OE-style replacement spark plug
- 0.7 mm laser-welded fine-wire iridium center electrode
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Platinum ground electrode for improved wear resistance
- Strong ignitability and stable combustion performance
- Machine-rolled threads help prevent seizing and cross-threading
- 100% pre-fired for quality assurance
- Purified alumina powder insulator for strength and thermal conductivity
- Five-rib insulator helps prevent flashover
- Copper-glass seal provides a gas-tight bond
- Thread diameter: 14 mm
- Thread pitch: 1.25 mm
- Seat type: Gasket
- Reach: 19 mm (3/4 in)
- Hex size: 5/8 in (16 mm)
- Terminal type: Solid
- Overall height: ISO
- Gap: 0.031 in (0.8 mm)
- Center electrode material: Iridium
- Center electrode type: Fine Wire
- Center electrode size: 0.7 mm
- Center electrode projection: Projected
- Ground electrode material: Platinum
- Ground electrode type: Standard
- Ground electrode quantity: 1
- Resistor: Yes
- Resistor value: 5k Ohm
- Heat range: 20
- Torque specs, cast iron: 26-30 lb-ft
- Torque specs, aluminum: 15-22 lb-ft
- Warranty: 12 Months
- Fitment: Automotive
Vehicle Fitment
Mitsubishi
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Eclipse GS — 2005
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Eclipse GT — 2005
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Eclipse GTS — 2005
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Eclipse Spyder GS — 2005
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Eclipse Spyder GT — 2005
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Eclipse Spyder GTS — 2005
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Endeavor Limited — 2004-2006
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Endeavor LS — 2004-2011
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Endeavor SE — 2007-2011
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Endeavor XLS — 2004-2005
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Galant DE — 2004-2007
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Galant ES — 2004-2007
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Galant GTS — 2004-2007
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Galant LS — 2004-2006
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Galant Ralliart — 2007
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Galant SE — 2005-2007
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Lancer DE — 2008-2010, 2013
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Lancer ES — 2008-2015
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Lancer ES Sportback — 2013-2014
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Lancer Evolution Final Edition — 2015
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Lancer Evolution GSR — 2008, 2010, 2013-2015
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Lancer Evolution MR — 2008, 2010, 2013-2015
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Lancer Evolution MR Touring — 2010
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Lancer Evolution SE — 2010
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Lancer GT — 2013-2015
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Lancer GT Sportback — 2013-2014
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Lancer GTS — 2008-2010
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Lancer GTS Sportback — 2010
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Lancer Ralliart — 2009-2015
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Lancer Ralliart Sportback — 2010
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Lancer SE — 2013-2015
