Best NGK Spark Plug Reviews 2022

The inconsistency in ignition means the engine's average output suffers greatly. You will get less horsepower and torque output, resulting in great losses in speed and distance.

Initially, the spark plug is bound to work properly. But the spark plug may lose its consistency with time. At that particular moment, replacing the stock spark plug is the only way left to get back the engine’s efficiency. Experts suggest one should replace a spark plug every 30,000 to 50,000 miles.

If you are thinking about replacing the stock ignition spark plugs to get back the efficiency, NGK is one of the trustiest brands of many.

This article contains the list of the seven best NGK spark plugs to redeem the efficiency of your vehicle's engine. Without any further I say, let' get started with the presentation-

Best NGK Spark Plug

Our Top Picks

Overall best: NGK BKR5EIX-11 Iridium IX Spark Plug, standard

A reasonable price and enough longevity should please you without having any doubts.

NGK # 6994 LASER IRIDIUM Premium Spark Plugs IZFR6K

The inclusion of Iridium on the central electrode and Platinum on the ground electrode will prevent fast wearing.

NGK (7090-4PK) BKR5EGP G-Power Spark Plug

The fine wear electrode will deliver better acceleration and fuel economy at a decent price range.

NGK (6962) Spark Plug - BKR6E, One Size

The unique V-cut central electrode will ensure better ignitibility to make the system more efficient.

NGK 6619 Iridium Spark Plugs LFR6AIX-11

An Iridium-based sparkplug never disappoints with quality.

NGK DPR7EIX-9 Iridium IX Spark Plug

DPR7EIX-9 will always ensure extreme ignition capability.

NGK 3951 Pack of 8 Spark Plugs (TR55)

TR55 is popular for delivering optimum acceleration and engine efficiency.

How does a spark plug work?

If a four-stroke engine delivers 5000rpm at max, it means that the crankshaft rotates 5000 times per minute. It requires two crank rotations to complete a four-stroke cycle. That means the engine completes almost 2500 four-stroke cycles in a minute. All four strokes are intake, compression, power, and exhaust.

Fuel and air need to insert into the cylinder during the intake stroke. The spark plug ignites compressed air and fuel at the end of the compression stroke, allowing the piston to create power. Finally, burned gasses are forced out of the cylinder through an exhaust pipe.  

The spark will ignite the fuel anytime between 0 and 500 microseconds.  An ideal spark plug should ignite the fuel immediately. If the fuel ignites later, the expanding gases must fill a larger area, resulting in less pressure on the piston. As a result, the engine will deliver less horsepower and torque output.

Best NGK Spark Plugs

1. NGK BKR5EIX-11 Iridium IX Spark Plug, standard

Specifications

Thread diameter

14mm

Thread pitch

1.25mm.

Seat type

Gasket.

Reach

19mm(3/4’’)

Hex size

5/8’’ (16mm)

Central electrode material

Iridium

Central electrode type

Fine wire.

Ground electrode material

Nickel.

Resistor

Yes

Torque specs

Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

Longevity

50k miles

The BKR5EIX is our top pick on this list. This iridium spark will generate high-efficiency ignition through the fine wire central electrode. On top of that, the Iridium alloyed material will require a high-end melting point. As a result, the spark plug will comply with most high-tech and high-performing modern-day vehicles.

Furthermore, the trivalent metal plating on the spark plug makes the product completely rust and corrosion-resistant. A great thing about this spark plug is the pure alumina ceramic insulator. As a result, the device will deliver optimum strength and superior heat transfer to make your engine more efficient and workable.

Moreover, the inclusion of the copper core will remove the heat with proper dexterity to retain the safety of the engine. Again, the triple sealing process will be handy to prevent all kinds of leakages to make the piston faster and more dynamic.

Finally, BKR5EIX will never disappoint you with its long-time service. You can expect almost 50k miles of runtime through this essential spark plug gear.

PROS

  1. Getting a longer runtime is now possible through this iridium spark plug. You will get nearly 50k miles of efficient runtime from this device.
  2. The inclusion of perfect central and ground electrode material will ensure the fastest ignition to make the system more dynamic.
  3. The perfect sealing mechanism of the plug will be handy to protect the system from all kinds of damages.

Note

All these sparkplugs are compatible with a large number of automotive, Power Sports, lawnmowers, outdoor power equipment, and racing carts. Do check the compatibility before confirming the purchase to ensure essential fitment.

2. NGK # 6994 LASER IRIDIUM Premium Spark Plugs IZFR6K

Specifications

Thread diameter

14mm

Thread pitch

1.25mm.

Seat type

Gasket.

Reach

19mm(3/4’’)

Hex size

5/8’’ (16mm)

Central electrode material

Iridium

Central electrode type

Fine wire.

Ground electrode material

Platinum 

Resistor

Yes

Torque specs

Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

Longevity

100k miles.

This one is even better if you consider the runtime or longevity. The IZFR6K can ensure longevity for a record distance of 100K miles. Install the item once to relieve all the tensions from your head regarding the maintenance.

Flashover is always a common problem with most spark plugs. But IZFR6K with its corrugated ribs will prevent flashover to a great extent to give you a smooth and tidy experience. Like the previous one, this Iridium spark plug also comes with a three-way sealing. As a result, there will have less chance of leakage and damage.

This laser spark plug can deliver up to 5kOhm resistor value to ensure an optimum range of safety. Moreover, the IZFR6K uses Iridium on the central electrode and Platinum on the ground electrode to make the ignition speed faster and more dynamic.

Again, the perfect metal plating on the spark plug will give it a precise finishing. As a result, there will have less chance of corrosion or rust damage. If you are looking for a device that will provide improved fuel efficiency and lower emissions, the IZFR6K will beat any of its competitors.

PROS

  1. IZFR6K will ensure better fuel efficiency and lower emissions to ensure high-end service.
  2. The inclusion of Iridium in the central electrode and Platinum in the ground electrode will prevent fast wearing.
  3. The longer runtime of the plug will keep you tension-free for a long time.

3. NGK (7090-4PK) BKR5EGP G-Power Spark Plug

Specifications

Thread diameter

14mm

Thread pitch

1.25mm.

Seat  type

Gasket.

Reach

19mm(3/4’’)

Hex size

5/8’’ (16mm)

Central electrode material

Platinum

Central electrode type

Fine wire.

Ground electrode material

Nickel.

Resistor

Yes

Heat range

5

Longevity

40k miles.

If you are looking for a device that is budget-friendly with decent quality, this G-Power spark plug from NGK should be the ideal choice to grab. Truths to be spoken, you will get less runtime with this item. The G-power spark plug can run 40k miles fluently before replacement. If you consider the price, 40k miles should not be a bad range at all.

The G-power spark plug uses Platinum on the central electrode and Nickel on the ground electrode. As a result, the ignition time will be much faster than usual. On top of that, the trapezoid cut ground electrode will be handy to reduce quenching to a great extent to make the system more efficient.

Furthermore, the fine-wear platinum central electrode will be handy to reduce the voltage level. As a result, the starting process will be faster than before. Moreover, you will get better acceleration power and fuel economy to save some of your bucks.

Finally, the spark plug with a copper construction will remove the heat to a great level to maintain safety. Choose this one to enhance the power of acceleration and to be more economical with your budget.

PROS

  1. The spark plug will help to reduce the voltage level to enjoy a fast start with the fine-wear platinum central electrode.
  2. The economical budget of the device should always please you with the quality.
  3. You will get better acceleration and more fuel economy through this item.

4. NGK (6962) Spark Plug - BKR6E, One Size

Specifications

Thread diameter

14mm

Thread pitch

1.25mm.

Seat type

Gasket

Reach

19mm(3/4’’)

Hex size

5/8’’ (16mm)

Central electrode material

Nickel

Central electrode type

V-type

Ground electrode material

Nickel (standard)

Resistor

Yes

Heat range

6

Longevity

30k miles.

The NGK BKR6E spark plug is for those who prefer having better ignitibility. The unique V-Cut central electrode will allow the spark to move fast to the edge of the electrode so that the spark can develop at a rapid pace. Furthermore, the inclusion of the essential electrode will reduce the percentage of quenching to a great extent.

Furthermore, the plug is quite protective with the trivalent metal plating. The perfect construction will protect the surface of the plug from all kinds of rust and corrosion attacks.

The spark plug also comes with a pure alumina silicate ceramic insulator. As a result, the heat shift process will be more dynamic and versatile to keep the system efficient. You will always remain safe from all kinds of leakage-related problems through the triple sealing process.

Moreover, the spark plug uses Nickel on both electrodes to deliver better ignition speed. As a result, the ignition process will be much faster than usual. By the way, the spark plug can run up to 30k miles fluently before the next replacement.

PROS

  1. This spark plug is much economic at a price of under 4$ dollars.
  2. The heat transfer process will be much faster with the pure alumina silicate ceramic insulator.
  3. The unique v-cut central electrode will ensure better ignitibility.

5. NGK 6619 Iridium Spark Plugs LFR6AIX-11

Specifications

Thread diameter

14mm

Thread pitch

1.25mm.

Seat type

Gasket

Reach

26.5mm (1.04")

Hex size

5/8’’ (16mm)

Central electrode material

Iridium 

Central electrode type

Fine wire

Ground electrode material

Nickel (standard)

Resistor

Yes

Heat range

6

Longevity

50k miles.

This LFR6AIX-11 is an Iridium-based spark plug to make your experience great with the service.  First of all, the inclusion of the fine wire iridium central electrode will ensure high-end durability and stability while generating the spark.

Furthermore, the high melting point of the Iridium alloyed material will provide extreme support to all the high-performing engines. The spark plug uses standard Nickel on the ground electrode, ensuring optimum transmission between the two electrodes.

Like a typical NGK spark plug, the LFR6AIX-11 also comes with a stable copper core. As a result, the heat removal process will be more dynamic and versatile. On top of that, the three-way sealing will prevent all kinds of breakage and deterioration.

The runtime of this item is also up to the mark. The spark plug will deliver you a continuous service of up to 50k miles. If your first choice is an Iridium-based spark plug, the LFR6AIX-11is always an excellent product to give a try.

PROS

  1. The fine wire central electrode will deliver up to the mark ignition to make the engine more dynamic.
  2. You will get better acceleration and engine efficiency through this item.
  3. The spark plug will last for more than 50k miles.

6. NGK DPR7EIX-9 Iridium IX Spark Plug

Specifications

Thread diameter

12mm

Thread pitch

1.25mm.

Seat type

Gasket

Reach

19mm (3/4")

Hex size

18mm

Central electrode material

Iridium 

Central electrode type

Fine wire

Ground electrode material

Nickel (standard)

Resistor

Yes

Heat range

7

Longevity

50k miles.

An iridium-based spark plug never disappoints with quality. This DPR7EIX-9 spark plug comes to develop the throttle response so that you can get better acceleration and distance simultaneously. Besides, the Iridium-based construction will deliver superior anti-fouling to make your experience great with the item.

Furthermore, the laser-welded iridium tip of the plug will provide durability and consistency at the same time to make the product more versatile. On top of that, the longer insulator nose with the corrugated ribs will be handy to prevent fouling and flashover.

This one also comes with the typical three-way sealing mechanism to prevent leakage-related issues. On the other hand, the perfect metal plating of the device will prevent rust and corrosion damage.

This one will provide the same runtime as the previous one. You can expect to get almost 50k miles of runtime through this exclusive plug. Finally, the essential heat range of the plug should provoke you to grab the item to get better performance.

PROS

  1. The Gasket seat type should ensure versatility in terms of performance.
  2. The longer insulator nose will prevent fouling to a great extent.
  3. The acceleration and efficiency rate of your engine will develop to another level.

7. NGK 3951 Pack of 8 Spark Plugs (TR55)

Specifications

Thread diameter

14mm

Thread pitch

1.25mm.

Seat type

Tapered

Reach

18mm (.709")

Hex size

5/8" (16mm)

Central electrode material

Nickel

Central electrode type

V-Cut

Ground electrode material

Nickel

Resistor

Yes

Heat range

5

Longevity

30k miles.

Our final recommendation for a spark plug from NGK is the TR55. This one is a unique spark plug with 14mm of thread diameter. Unlike the typical gasket seat type, this one comes with a tapered seat to provide more stability.

Moreover, the unique V-cut central electrode will deliver optimum performance by enhancing the ignition capability. The device can withstand extreme temperatures to keep the system safe and secure for a long time.

Besides, the nickel-based ground electrode will make the balance between the two electrodes to deliver the most convenient experience. 

By the way, the package includes six spark plugs inside of it. A single plug will provide almost 30k runtime. That means purchasing the whole package can keep you tension free another two to three years.

PROS

  1. The tapered seat type will provide more versatility.
  2. The perfect Hex size will deliver extreme ignition capability.
  3. The combination of the proper central and ground electrode will provide essential quality.

Buying guide

Never miss out checking these aspects before purchasing a spark plug for your vehicle-

Central electrode

The electrode of a spark is probably the most important part to consider. The electrode provides the necessary power to ignite the spark. Iridium, Platinum, and Nickel are the most common types of central electrodes you would notice while confirming the purchase. Most modern-day spark plug demands iridium central electrode to deliver better efficiency.  If you have the budget, you may go with Iridium based spark plug to be more dynamic with the process. We are not saying that Platinum or Nickel is not up to the mark. They can also deliver quality service. But you may have to sacrifice the runtime a little.

Ground electrode

The central electrode and the ground electrode are both interconnected. If you are paying attention to the central electrode, it becomes compulsory to check the ground electrode, too. Choose the perfect type and material to ensure the fastest transmission between the two electrodes. Choosing a better electrode will help you to accelerate the engine performance to another level.

Longevity

Experts always suggest replacing a spark plug after every 30,00o to 50,000 miles.  It depends on the longevity of the spark plug you are using. On average, the maximum runtime a spark plug can deliver is around 100k miles. On the other hand, the minimum runtime will be near 30k miles. Choose a plug that will deliver up to the mark runtime so that you can get better runtime and distance without sacrificing efficiency.

Essential sealing

An essential sealing protects the engine from all kinds of damage and deterioration.  Double-check whether the spark plug you are choosing comes with essential sealing or not. A precise sealing will be handy to get better efficiency and protection simultaneously. Besides, the perfect metal plating on the plug will protect the surface from corrosion or rust-related damages. Spend some extra time on research so that you no longer have to suffer after installing the product.

Fitment

A spark plug is usually compatible with a large number of automotive, Power Sports, or other vehicles. That is why they are most of the time universal so that you don't have to panic with the installation. But still, you should not ignore checking the compatibility. Checking the compatibility will provide smoothness while completing the installation.

Final words

We have tried our best to deliver the most up-to-date and versatile NGK spark plugs on the market. If you are facing trouble with your vehicle’s engine efficiency and acceleration, try replacing the old stock spark plug with a product from our list. We hope you will love the experience to consult with us again for your next replacement. Until then, take care of your vehicle.

Last Updated on January 1, 2022 by sajjad

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