HKS Rotary Applications M-Series Spark Plugs Heat Range 10.5 - 50003-M525RE

HKS M-Series Super Fire Racing spark plugs are high performance Iridium plugs designed to handle advanced levels of tuning and provide Improved ignition performance, durability and anti-carbon build-up.

The Iridium alloy is used because of its durability and reliability. On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity. With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration. The Iridium plugs are available for multiple applications and offered in ?colder? heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered. M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load. All spark plugs are sold individually.

Features:

• 0.6mm Iridium Alloy Center Electrode
• Outer Electrode with Platinum Chip
• Short Type Outer Electrode (Anti-Vibration)
• Thermal Edge
• Prevent Carbon Build Up
• Heat Range: 10.5
• RE Type
• Thread Size: 14mm x 12.7mm
• Wrench Size: 20.8mm

• Mazda Rx-7 1979-1991
• Mazda Rx-7 FD3S 1993-2002
• Mazda Rx-8 2004-2009

• Pictures for marketing purposes only, actual product may vary