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CHAMPION 7318 Specifications
Insulator Height0.12 In.
Thread Diameter0.551 In.
Hex Size0.625 In.
Reach0.75 in.
Ground Electrode Quantity1
Manufacturer Heat Range12
Thread Diameter14.000 mm
Hex Size15.880 MM
ClassificationChampion Double Platinum
Electrical Terminal TypeNon-Removable Nut
Center Electrode Tip MaterialPlatinum Firing Tip
Ground Electrode Core MaterialPlatinum Pad Surface
Plug TypeRC12PMPB4
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

Which Spark Plug Is Right For You?

Material Cost Performance Lifespan Highlights
$$$ · Ultimate Ignitability & Durability
· Fast Throttle Response & Best Cold Starts
$$ · Improved Starts & Acceleration
· More Power & Better Fuel Economy
Double Platinum
$$ · Improved Efficiency
· Good For Waste Spark Systems
$ · Reduced Carbon Build-Up
· Good for Coil-On-Plug Systems
$ · Good Conductor
· Least Durable

Corona vs. Flashover
Alternate/OEM Part Number(s): RC12PMPB4

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