E3 Diamond Fire Spark Plugs E3.56 : E3 Diamond Fire Spark Plug E3.56 (2024)

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:

  • 1985-1994 Nissan Maxima
  • 1985-2010 Toyota Corolla
  • 1986-1986 Pontiac Parisienne
  • 1986-1990 Chevrolet Caprice
  • 1985-1985 Oldsmobile Toronado
  • 1985-1990 Oldsmobile Custom Cruiser
  • 1986-2005 Toyota Celica
  • 1987-1989 Nissan Pathfinder
  • 1988-2011 Honda Civic
  • 1991-1991 Isuzu Stylus
  • 1995-1997 Toyota Previa
  • 1996-2000 Lexus SC400
  • 1984-1989 Nissan 300ZX
  • 1986-1987 Buick Regal
  • 1987-1989 Pontiac Safari
  • 1988-1991 Honda CRX
  • 1988-2009 Toyota 4Runner
  • 1989-1992 Toyota Cressida
  • 1990-1990 Peugeot 405
  • 1990-2004 Subaru Legacy
  • 1991-1993 Nissan NX
  • 1992-2003 Lexus ES300
  • 1986-1991 Acura Integra
  • 1987-1990 Cadillac Brougham
  • 1987-1998 Saab 9000
  • 1988-1989 Mazda 323
  • 1990-1991 Lexus ES250
  • 1995-2000 Dodge Stratus
  • 1998-1998 Mazda Protege
  • 1999-2004 Suzuki Vitara
  • 2000-2000 Chrysler Cirrus
  • 2001-2004 Nissan Frontier
  • 2001-2010 Toyota Highlander
  • 2002-2006 Acura RSX
  • 2002-2007 Suzuki Aerio
  • 2003-2009 Lexus GX470
  • 2001-2006 Lexus LS430
  • 1996-1998 Suzuki X-90
  • 1997-2001 Plymouth Neon
  • 2001-2007 Lexus GS430
  • 2002-2004 Kia Spectra
  • 2002-2008 Toyota Solara
  • 2002-2010 Dodge Ram 1500
  • 2002-2010 Lexus SC430
  • 2004-2008 Acura TL
  • 2006-2010 BMW 550i
  • 1984-1989 Nissan Stanza
  • 1985-1985 Oldsmobile Delta 88
  • 2002-2004 Audi A6 Quattro
  • 2002-2006 Audi A4 Quattro
  • 2003-2006 Subaru Baja
  • 2005-2008 Acura RL
  • 2005-2009 Toyota Tundra
  • 2006-2008 BMW 750i
  • 2004-2012 Mitsubishi Eclipse
  • 2005-2010 Jeep Grand Cherokee
  • 2006-2009 Mitsubishi Raider
  • 2010-2011 Kia Soul
  • 2011-2011 Ram Dakota
  • 2010-2012 Lexus HS250h
  • 1986-1989 Suzuki Samurai
  • 1989-1999 Nissan Sentra
  • 1990-1995 Ford Taurus
  • 1995-2002 Suzuki Esteem
  • 1995-2004 Toyota Avalon
  • 1996-2008 Toyota RAV4
  • 1997-2000 Lexus LS400
  • 1997-2005 Dodge Neon
  • 1999-2005 Saab 9-5
  • 1999-2008 Suzuki Grand Vitara
  • 2004-2006 Lexus ES330
  • 2005-2005 Saab 9-2X
  • 2005-2009 Toyota Sequoia
  • 2005-2010 Scion tC
  • 2006-2008 BMW 750Li
  • 2007-2009 Acura MDX
  • 1989-1990 Nissan Pulsar NX
  • 1989-1991 Sterling 827
  • 1990-1992 Infiniti M30
  • 1995-1995 Honda Passport
  • 1998-2000 Lexus GS400
  • 1998-2001 Suzuki Swift
  • 1998-2007 Lexus LX470
  • 1998-2007 Toyota Land Cruiser
  • 1999-2003 Lexus RX300
  • 1999-2003 Saab 9-3
  • 2000-2004 Subaru Outback
  • 2001-2006 Toyota Sienna
  • 2002-2005 Ford Thunderbird
  • 2003-2003 Mitsubishi Outlander
  • 2003-2010 Kia Rio
  • 2004-2011 Mitsubishi Endeavor
  • 2006-2008 Lexus RX400h
  • 2006-2010 BMW 650i
  • 2006-2010 BMW X5
  • 2006-2010 Jeep Commander
  • 1985-1987 Oldsmobile Cutlass Salon
  • 1985-1988 Oldsmobile Cutlass Supreme
  • 1985-1990 Buick LeSabre
  • 1986-1998 Saab 900
  • 1986-1998 Toyota Supra
  • 1987-1988 Sterling 825
  • 1990-1993 Mazda Miata
  • 1994-1995 Geo Tracker
  • 1996-2000 Plymouth Breeze
  • 1998-1998 Kia Sephia
  • 1999-2004 Subaru Forester
  • 2000-2006 Lincoln LS
  • 2002-2004 Audi A6
  • 2002-2005 Audi A4
  • 2004-2006 Lexus RX330
  • 2005-2008 Suzuki Reno
  • 2007-2013 Honda Fit
  • 2008-2010 Kia Rio5
  • 2008-2010 Mitsubishi Lancer
  • 1985-1989 Buick Electra
  • 1986-1990 Acura Legend
  • 1987-2011 Toyota Camry
  • 1988-1990 Honda Prelude
  • 1993-2004 Subaru Impreza
  • 2002-2012 Jeep Liberty
  • 2003-2006 Mitsubishi Montero
  • 2004-2006 Suzuki Verona
  • 2004-2010 Dodge Dakota
  • 2005-2006 Suzuki XL-7
  • 2008-2011 Dodge Nitro
  • 1984-1998 Nissan 200SX
  • 1985-1985 Buick Riviera
  • 1985-1995 Toyota MR2
  • 1986-1986 Cadillac Fleetwood
  • 1987-1989 Nissan D21
  • 1989-1998 Suzuki Sidekick
  • 1992-1994 Lexus SC300
  • 2003-2012 Toyota Matrix
  • 2004-2009 Dodge Durango
  • 2004-2009 Mitsubishi Galant
  • 2005-2007 Honda Accord
  • 2008-2012 Scion xB
  • 2011-2012 Ram 1500

    The advanced E3 DiamondFire design increases combustion pressure and increases power in the engine.

    Product Descripton:

  • Spark Plug
  • Diamond Fire
  • 14 mm Thread
  • 0.750 in Reach
  • Gasket Seat
  • Resistor
  • Sold Individually
  • E3 Diamond Fire Spark Plugs E3.56 : E3 Diamond Fire Spark Plug E3.56 (2024)


    Do E3 spark plugs really make a difference? ›

    E3 spark plugs have a unique ground electrode that encourages more turbulence in air/fuel mixture. This leads to a more complete burn of the available fuel and the downstream benefits of improvements in power, fuel efficiency, and reduced emissions."

    Do E3 spark plugs add horsepower? ›

    By simply replacing your existing plugs with premium E3 spark plugs, your ride will have the performance it deserves. Horsepower gains of 4-6% can be expected, depending on engine class size.

    What are Diamond Fire spark plugs? ›

    The DiamondFIRE ground electrode configuration increases the amount of combustion pressure created during each power stroke of an engine, which results in a marked increase in power output, fuel economy, and reduced emissions in all gasoline engines.

    Are E3 spark plugs good for small engines? ›

    E3 Spark Plugs Small Engine Plugs – For More Fuel Economy & Less Emissions. E3 Spark Plugs, with unique DiamondFire technology, deliver higher fuel economy, lower emissions and improve engine performance for all small engines including: blowers, weedeaters, generators, and lawn mowers.

    Do E3 spark plugs increase gas mileage? ›

    Writer Larry Edsall recently undertook a 5,000 mile road trip – one he does annually – and decided to try out the E3 plugs. While E3 claims a 3-5 percent improvement in mileage, Edsall found his dipped from 20.11/19.98 the previous two years to 19.18 with the E3 plugs.

    How many miles do E3 spark plugs last? ›

    How often you change the spark plugs in your vehicle depends upon the type of plugs you use and how you drive the vehicle. Naturally, better plugs and easy driving conditions are optimal. E3 automotive spark plugs offer a 100K mile warranty, or 5 years from the date of purchase.

    Do you set the gap on E3 spark plugs? ›

    E3 spark plugs for automotive applications feature a unique, three-leg ground electrode that is pre-gapped at our factory, specifically designed to meet the O.E. requirements for the vehicles they are listed to fit, so gap adjustments typically won't be necessary.

    Can you use E3 spark plugs in a car? ›

    When your vehicle's plugs are worn down or failing and you need a car spark plug replacement, choose E3 spark plugs with their patented DiamondFIRE ground electrode. E3 automotive plugs were designed to burn fuel more efficiently by burning it more completely.

    What spark plugs increase horsepower? ›

    Copper spark plugs run cooler and provide more power in performance driving situations. They are often installed as original equipment in turbocharged engines and engines with higher compression ratios. Copper spark plugs are also often used in older (pre-1980s) vehicles with a distributor-based ignition system.

    What is diamond fire and how does it work? ›

    A diamond's "fire" is the effect produced when white light disperses into rainbow colors when it hits the diamond's facets (the angled cuts in the stone). There are two main kinds of facets: Physical facets and virtual facets. A physical facet is an actual cut in a diamond.

    Are E3 spark plugs platinum? ›

    *NOTE: Precious metals like platinum, silver and gold are not used on central electrodes for improved electrical conductivity.

    Are E3 spark plugs iridium? ›

    With decades of experience in spark plug engineering and the automotive aftermarket, the principals of E3 Spark Plugs realized that the key to producing a better spark plug did not lie in the use of fancy metals, such as iridium or platinum.

    Is E3 a good spark plug brand? ›

    I love these spark plugs they are very good I use them exclusively on my two and four cycle motors. They come in good packaging and they are built to get your needs taken care of. The E3 Spark Plug E3. 46 made my riding lawnmower engine start immediately, even in cool weather.

    How much horsepower do E3 spark plugs add? ›

    Independent tests have proven that E3 plugs, when compared to competitive spark plug brands, increase horsepower up to 12 hp, depending on engine class.

    What are the benefits of E3 spark plugs? ›

    E3 automotive spark plugs utilize the latest E3 technologies to help engines operate more efficiently by burning fuel more completely. Our patented DiamondFIRE ground electrode gets the flame (or combustion process) started earlier in the combustion chamber before gas is vented off when the exhaust valves open.

    Do Top Fuel dragsters use E3 spark plugs? ›

    It is built to have a very cold heat range, non-resistor, and is used in nitromethane fueled engines typically found in Top Fuel/Funny Car drag racing and similar applications. E3.

    Do high performance spark plugs make any difference? ›

    Investing in high-performance spark plugs is a surefire way to save some money in the long run. Better gas mileage is just the beginning. These premium spark plugs last longer than conventional plugs, which means you'll be able to go a longer time between tune-ups, keeping your maintenance costs down.

    Are higher quality spark plugs worth it? ›

    Premium spark plugs not only meet original equipment specifications, many times they exceed them. If you have your spark plugs replaced by a mechanic or repair shop, insist they use high-quality spark plugs. Premium spark plugs not only meet original equipment specifications, many times they exceed them.


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