The DENSO IW31 Iridium Spark Plug is designed for dependable ignition performance in demanding automotive and powersports applications. Manufactured by DENSO and identified by manufacturer and vendor part number 5319, this spark plug uses a high-strength iridium center electrode engineered to withstand temperatures up to 4,000°F. The IW31 model is suitable for applications requiring a durable, high-performance iridium plug with reduced voltage demand and consistent spark delivery.
Its fine 0.4 mm iridium electrode helps lower the voltage required for ignition while supporting efficient firing performance. A 360-degree laser-welded electrode construction creates a secure seal that resists wear under severe operating conditions. The ground electrode incorporates a tapered cut and U-groove design, creating a larger flame center area to promote reliable combustion and stable engine operation.
Use the DENSO IW31 Iridium Spark Plug as a direct replacement when vehicle or equipment fitment specifications call for model IW31 and part number 5319. Confirm thread, heat range, reach, and application requirements before installation to ensure proper compatibility. This DENSO spark plug is built for long-lasting service and consistent ignition performance in engines exposed to high temperatures and demanding conditions.
Features:
- Brand: DENSO
- Model: IW31
- Manufacturer part number: 5319
- Vendor part number: 5319
- Type: Iridium spark plug
- Temperature resistance: Withstands temperatures up to 4,000°F
- Electrode design: Fine 0.4 mm iridium center electrode helps reduce voltage requirements
- Welding construction: 360-degree laser-welded electrode seal resists wear
- Ground electrode: Tapered cut and U-groove design supports a larger flame center area
- Fitment: Intended for applications specifying DENSO IW31 spark plug model and part number 5319