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E3 Diamond Fire Spark Plug E3.58

Spark Plug, Diamond Fire, 14 mm Thread, 0.750 in Reach, Gasket Seat, Resistor, Each
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Race car drivers will tell you that the single sharp edge on spark plug electrodes wears out too fast for long term use. The E3 DiamondFire design presents multiple sharp edges to the circular sharp edge of the center electrode, which allows the spark to naturally seek the path of least resistance. The problem is that each time a spark jumps between two opposing spots of the electrode pair, the local resistance increases. After a few sparks, the local resistance becomes so high that the spark seeks alternate sites to initiate from and land on.

Multiple sharp edges give the spark more paths to follow, thus reducing wear on each part of the electrode. The E3 prototypes we tested outlasted all non-platinum spark plug in longevity even though they were made from mild steel. For production plugs, we use a special high-temperature alloy with a high nickel content plus additional elements to make an extremely long-lived electrode pair.

The E3 design also keeps its "freshness" much longer than standard plugs. DiamondFire plugs create more power while using less fuel (brake specific fuel consumption) than any other design. During our testing, we discovered that standard plugs degrade quickly, losing up to 10% of their power after just 50 hours of use (about 1, 200 miles in a typical car). This is why race car drivers change spark plugs between heats: The multiple sharp edges of the E3 DiamondFire design create better combustion when new and keep their edge "sharpness" for a considerable time.

Additionally, the three legs that support the special geometry of our design move heat out of the ground electrode, which helps the electrode last longer. The center electrodes are forged with a copper center core surrounded by a nickel alloy sheath and tip. The copper pulls heat out of the center electrode's tip, which also helps durability. The copper core is virtually equal to platinum in extending electrode life.


E3 Spark Plug Flame Kernel Shape:

  • Flame moves toward piston and bulk air/fuel mixture - less quenching on cylinder walls
  • Reduced time delay in flame growth - shorter path to piston head
  • Faster flame growth compared to standard plugs
  • Larger flame kernel moves heat faster into combustion chamber
  • Larger flame front creates more localized pressure, making a faster pressure rise in cylinder during the power stroke
  • Vehicle Applications:

  • 1977-1978 American Motors Gremlin
  • 1978-1980 American Motors Pacer
  • 1978-1983 Jeep DJ5
  • 1980-1987 Jeep Wagoneer
  • 1978-1978 American Motors Matador
  • 1978-1983 Jeep CJ5
  • 1978-1986 Jeep CJ7
  • 1988-1989 Eagle Premier
  • 1993-2004 Jeep Grand Cherokee
  • 1993-2004 Chrysler Concorde
  • 1986-1992 Jeep Comanche
  • 2001-2006 Volkswagen Golf
  • 2001-2002 Chrysler Prowler
  • 2004-2006 Dodge Ram 1500
  • 2008-2010 Chrysler Town & Country
  • 1978-1980 American Motors AMX
  • 1980-1988 American Motors Eagle
  • 1981-1985 Jeep Scrambler
  • 2007-2008 Dodge Sprinter 3500
  • 2008-2010 Dodge Avenger
  • 1987-2006 Jeep Wrangler
  • 1993-1997 Eagle Vision
  • 1994-1996 Chrysler New Yorker
  • 2009-2010 Dodge Journey
  • 1978-1987 Jeep J10
  • 1979-1983 American Motors Spirit
  • 1984-1986 Jeep Grand Wagoneer
  • 1994-2001 Chrysler LHS
  • 1997-2001 Plymouth Prowler
  • 1999-2004 Chrysler 300M
  • 2001-2008 Volkswagen Beetle
  • 2004-2008 Chrysler Pacifica
  • 2007-2010 Chrysler Sebring
  • 1978-2001 Jeep Cherokee
  • 1993-2004 Dodge Intrepid
  • 2005-2008 Dodge Magnum
  • 2005-2010 Chrysler 300
  • 1992-2006 Dodge Viper
  • 1996-2002 Dodge Dakota
  • 2006-2009 Volkswagen Rabbit
  • 2006-2010 Dodge Charger
  • 2007-2008 Dodge Sprinter 2500
  • 2008-2010 Dodge Grand Caravan
  • 2009-2010 Dodge Challenger
  • 2009-2014 Volkswagen Routan
  • 1978-1983 American Motors Concord
  • 2001-2007 Volkswagen Jetta
  • 2007-2011 Dodge Nitro

  • PROP 65

    This product can expose you to chemicals including Chromium, which is/are known to the State of California to cause cancer and birth defects or other reproductive harm


    • E3PE3.58
    • E3PE3.58
    • 894489000589
    • E3 Spark Plugs
    • Available
    • Same Day Shipping!
    • New

    Shipping Information

    • Item Requires Shipping
    • 0.1 lbs.
    • W1.0000” x H0.9000” x L3.5000”
    • Orders over $149 ship free. Oversize items are excluded.

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