CHAMPION
More Information for CHAMPION 7405
{Alternate Inventory Numbers: RN14PMP}
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CHAMPION 7405 Specifications
Insulator Height0.12 In.
Thread Diameter0.551 In.
Reach0.75 in.
Hex Size0.812 In.
Ground Electrode Quantity1
Manufacturer Heat Range14
Thread Diameter14.000 mm
Hex Size20.000 MM
ClassificationChampion Double Platinum
Electrical Terminal TypeNon-Removable Nut
Center Electrode Tip MaterialPlatinum Firing Tip
Ground Electrode Core MaterialPlatinum Pad Surface
Plug TypeRN14PMP
Resistor TypeYes
Double Platinum Power
Champion Double-Platinum Power spark plugs have platinum on both the center and ground electrodes. The center electrode is platinum fine wire that is riveted onto the nickel alloy center electrode. The ground electrode has a platinum pad welded to its surface.

This plug design is widely used for a distributorless ignition with a Waste Spark design. In this kind of ignition system, one bank of spark plugs fires from the center electrode to the ground and the other bank fires from the ground electrode to the center.

Features & Benefits:
  • More power, quicker acceleration
  • Fine wire center electrode and V-trimmed ground electrode create a sharp spark focus
  • Maintains stable operating temperature under all engine loads
  • Heat-Active™ alloy allows electrodes to reach optimal temperature
  • Platinum conductors on both center and ground electrodes for longer life and minimal wear
This spark plug is pre-gapped, but may require minor adjustments with a Spark Plug Gap Tool / Feeler Gauge to match your engine's specifications. For proper engine performance, gaps should be within ±0.004" of OE-Recommended value.
Which CHAMPION Spark Plug Is Right For You?

Material / Series Lifespan / Durability Performance / Ignitability Efficiency / Fuel Economy
Copper / Nickel Plus
Copper		 ★ ★
Platinum Power
Platinum		 ★★ ★★★★ ★
Double Platinum
Double Platinum		 ★★★★ ★★★★ ★
Iridium
Iridium		 ★★★ ★★★★★ ★★

CHAMPION Warranty Information:
Iridium plugs 7 years - Double Platinum Power 5 years - Platinum Power 3 years - Copper Plus 2 years