

Denso Iridium Racing spark plugs are elite spark plugs for the serious racer that best demonstrate their performance improvement during acceleration. Their 0.4mm iridium-rhodium alloy center electrodes require less voltage to fire (up to 5,000 V less) and produce the hottest, most concentrated spark. Plus, 100 percent pure platinum 0.8mm ground electrodes reduce the risk of melting during harsh racing conditions.
Resistance 5000.0 ohms
Ground Electrode Tip Design Full Platinum
Ground Configuration Slant
Ground Electrode Core Material Nickel
Center Electrode Core Material Copper
Center Electrode Tip Material Iridium
Pre-Gap Size 0.6 MM
Ground Electrode Quantity 1
Hex Size 16.0 MM
Manufacturer Heat Range 27
Seat Type Flat
Reach 19.00 MM
Thread Diameter 12.00 MM
Almost all Iridium Racing plugs contain a monolithic resistor that blocks noise that may affect electronic devices
* Burnished nickel plating on the housing for corrosion resistance; thinner on the threads to reduce head damage
* To withstand severe conditions, a patented 360 degree laser welding process secures the iridium tip
* Between the center electrode and insulator, a patented spark cleaning pocket burns off carbon, restoring electrical resistance
* 20 percent stronger insulator
* Silicone coated insulator surface is isolated from moisture and carbon, preventing a decrease in resistance
* Ground electrode is welded on and gapped without any bending, reducing residual stress and increasing durability
* Enlarged housing end-face chamfer allows slight tuning inaccuracies, improves self-cleaning, and prevents fouling
* Durable, reusable packaging protects spark plugs when not in use
* Handles extreme compression and boost levels
* Maximizes track time, minimizes downtime
* Delivers maximum spark energy
* Withstands temperatures greater than 4000 degrees F
Brand:Denso
Part Number:5731
UPC:042511057319