Best Spark Plugs

Review & Comparison, Last Update May 31, 2019
Spark plugs are small but mighty. These little devices create the ignition for the combustion necessary to start your car. The best spark plugs will be able to offer improved spark while reducing the travel time from the spark to the combustion gases. ...Read more ...Read less
BEST 2019
PROS
CONS
OUR VERDICT
Kit Contents
Material
Seat Type
Reach
Hex Size
Warranty
 
PROS

The 360-degree continuous laser weld works wonders fusing the corrosion-resistant metal firing pin to the base, adding durability points. The nickel-plated shell comes equipped with rolled threads, so you don't have to rely on the usual anti-seize lubricants. The ribbed insulator design is able to prevent the flashover issue. 

CONS

The check engine light occasionally shows up for no reason. 

OUR VERDICT

Bosch 9614 double iridium plugs are definitely the best plugs on the list. They might just be the best that the market has to offer today. These things are ridiculously durable. Their performance is off the charts. Among other things, the sparks give you reduced voltage for reliable ignition.

detailed parameters
Kit Contents

Pack of 4 spark plugs (pack of 10 and pack of 1 also available)

Material

Iridium Center Electrode Tip with copper center core

Seat Type

Gasket

Reach

0.75"

Hex Size

5/8"

Warranty

7 years

PROS

The company's DiamondFire electrode technology is able to create a superior spark, with the resulting flame front extending further into the cylinder, producing much more localized pressure. The plug presents the flame kernel to the piston more directly, reducing the travel time from the spark to the combustion gases.

CONS

The price doesn't entirely correlate with the quality. 

OUR VERDICT

Provided you don't mind forking over the dough for it, E3.36 Powersports Spark Plug is as good as they come. It will give you a longer plug life, reduced emissions, increased fuel efficiency, and improved power. As far as we're concerned, this is the best plug for sports cars and motorcycles.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Nickel Alloy Center Electrode Tip with a copper center core

Seat Type

Gasket

Reach

0.75"

Hex Size

5/8"

Warranty

5 years

PROS

The 0.6mm laser welded fine platinum tip does an excellent job reducing the required voltage. The result is a consistently stable spark and improved spark life. The trivalent metal plating has excellent anti-corrosion and anti-seizing properties. The triple gasket seal works wonders eliminating the combustion gas leakage.

CONS

The center electrode is very fragile.

OUR VERDICT

NGK 7090 BKR5EGP G-Power presents arguably the best platinum spark plug at an economical cost. These little tools will be able to keep your engine up and running much longer than your average plugs. Since they come at the same price, there's very little reason to settle for less.

detailed parameters
Kit Contents

Pack of 4 spark plugs (pack of 1 also available)

Material

Platinum Center Electrode Tip with a copper center core

Seat Type

Gasket

Reach

0.75"

Hex Size

5/8"

Warranty

1 year

PROS

The model is able to offer superior engine idle stability as well as the smoothest performance. Iridium allows for small, efficient electrode designs, making reliable cold starting and quick acceleration possible. The one-piece suppressor seal is able to help block the radio frequencies that can affect the vehicle electronics.

CONS

The tapered seat type is a little less durable than the gasket type. 

OUR VERDICT

ACDelco 41-101 will work very well for experienced drivers. Using these plugs, you'll be able to improve your engine's efficiency as well as your overall interactions with it. The fine-wire electrode works wonders burning away carbon deposits on the tip as they form.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Iridium Center Electrode Tip with a nickel center core

Seat Type

Tapered

Reach

0.75"

Hex Size

5/8"

Warranty

7 years

PROS

The copper never fails to improve conductivity and heat control for better overall wear. The company's very own Heat-Active technology allows the alloy to maintain stable operating temperature under all load conditions. Its throttle response is very quick.

CONS

The hex size is a little less popular, so make sure you have the right wrench. 

OUR VERDICT

Champion RJ19LM is an excellent replacement spark plug. It will be able to fit many different customers looking to put the plug into many different vehicles. Plus, the company is probably the biggest name in the business.

detailed parameters
Kit Contents

Pack of 1 spark plug (pack of 8 and pack of 4 also available)

Material

Nickel Alloy Center Electrode Tip with a copper center core

Seat Type

Gasket

Reach

0.375"

Hex Size

13/16"

Warranty

1 year

Bosch 9614 Double Iridium

Sparkling Performance

Bosch 9614 Double Iridium Spark Plugs aren't necessarily different but they are good. These things were engineered with high performance and long life in mind. The ultra-fine wire design and laser welded tapered ground electrode are the biggest contributors to that performance part. The 360-degree continuous laser weld works wonders fusing the corrosion-resistant metal firing pin to the base, adding durability points.

The iridium center electrode and the ground electrode, on the other hand, are responsible for making the pugs able to go the distance.

The nickel-plated shell comes equipped with rolled threads, so you don't have to rely on the usual anti-seize lubricants. The ribbed insulator design is able to prevent the flashover issue that so many mediocre plugs have been known to cause.

No gapping is required here, meaning that you get that optimal spark game going on with no adjustment necessary.

The fine wiring pin is able to reduce the voltage requirement.

About the only issue we have with these plugs is that the check engine light occasionally shows up for no reason.

With all that in mind, Bosch 9614 double iridium plugs are the best spark plugs on the list and some of the best plugs on the market right now. These things are ridiculously durable. Their performance is off the charts. Among other things, the sparks give you reduced voltage for reliable ignition.

Review of Bosch 9614 Double Iridium Spark Plug

Additional Info

    Manufacturer


 

E3 E3.36 Powersports

DiamondFire Electrode

E3.36 Powersports Spark Plug is excellent. We've but one issue with the model - it is a little expensive considering that the price they're asking is for 1 plug. That being said, it is not too expensive and the plug is damn good.

The company's DiamondFire electrode technology is able to create a superior spark, with the resulting flame front extending further into the cylinder, producing much more localized pressure.

In other words, the plug is able to present the flame kernel to the piston more directly, reducing the travel time from the spark to the combustion gases. It starts quicker and nearly eliminates the inhibiting carbon deposits' performance, giving you increased plug life and outstanding convenience in general.

Other than that, we could highlight the two legs that support the ground electrode's special geometry, aiding in heat dissipation for extended electrode life. Plus, the fact that the electrode is secured to the shell with these legs makes the component more resistant against shaking and vibrations.

The spark's faster flame propagation presents many benefits, including but not limited to less fuel being wasted, resulting in improved fuel efficiency.

All in all, provided you don't mind forking over the dough for it, E3.36 Powersports Spark Plug is as good as they come. It will give you a longer plug life, reduced emissions, increased fuel efficiency, and improved power. As far as we're concerned, this is the best plug for sports cars and motorcycles.

Review of E3 E3.36 Powersports Spark Plug

Additional Info

    Manufacturer


 

NGK 7090 BKR5EGP G-Power

High-End Performance at a Budget Price

NGK 7090 BKR5EGP G-Power plugs are very different compared to the previous entry. These automotive spark plugs are as affordable and cost-effective as they come. Considering the price, these plating alloy plugs will not fail to deliver improved performance with better fuel efficiency, lower emissions, and quicker starts.

The 0.6mm laser welded fine platinum tip does an excellent job reducing the required voltage. The result is a consistently stable spark and improved spark life.

The company's configurations pertaining the insulator noses work like a charm improving throttle response and preventing the usual fouling issue with corrugated ribs on the insulator to reduce flashover as much as possible.

As much as these things matter, the trivalent metal plating probably takes the cake. Its excellent anti-corrosion and anti-seizing properties are the reason these affordable plugs are able to deliver high-end durability, all while the triple gasket seal works wonders eliminating the combustion gas leakage.

The durability department's only weak link is the relatively fragile center electrode.

Apart from that, NGK 7090 BKR5EGP G-Power presents arguably the best platinum spark plug at an economical cost. These little tools will be able to keep your engine up and running much longer than your average plugs. Since they come at the same price, there's very little reason to settle for less.

Review of NGK 7090 BKR5EGP G-Power Spark Plug

Additional Info

    Manufacturer


 

ACDelco 41-101 Professional Iridium

Small, Efficient Electrodes

ACDelco 41-101, on just about every level, is a professional iridium spark plug. The model is able to offer superior engine idle stability as well as the smoothest performance. The aforementioned chemical element is the biggest contributor to the model's performance. It allows for small, efficient electrode designs, providing every opportunity for reliable cold starting and quick acceleration.

As much as it is about the materials though, there are other design elements here that play their part too. For one, we cannot overlook the fine-wire electrode that works wonders burning away carbon deposits on the tip as they form.

Other than that, it is the little things, like the one-piece suppressor seal that is able to help block the radio frequencies that can affect the vehicle electronics. The seal meters spark energy, extending electrode life and preventing combustion leakage.

However, the product doesn't come without its flaws. This is the tapered seat type spark. No matter how you slice it, the type is always at least a little less durable than the gasket type.

Long story short, ACDelco 41-101 will work very well for experienced drivers. Using these plugs, you'll be able to improve your engine's efficiency as well as your overall interactions with it. They are probably the longest-lasting tapered sparks, offering great mileage and performance well above the recommended norm.

Review of ACDelco 41-101 Professional Iridium Spark Plug

Additional Info

    Manufacturer


 

Champion RJ19LM (868) Copper Plus

Other Applications Too

Champion RJ19LM (868) is another addition to the list that comes at an affordable price. This spark plug doesn't necessarily present anything we haven't seen before but its performance is everything we've come to expect from quality spark plugs.

The model's copper center core is able to resist fouling as well as offer improved corrosion-resistance. The copper never fails to improve conductivity and heat control for better overall wear.

The nickel alloy center electrode tip has its moments too. The company's very own Heat-Active technology allows the alloy to maintain stable operating temperature under all load conditions. Its throttle response is very quick. All in all, the tip is able to offer a focused spark for maximum power in the shortest time span.

With its 0.375" reach, the spark plug is particularly versatile. It works just as well with passenger cars and sports cars as it does with lawn, garden, snow, and marine applications. The only problem on the versatility front is that the 13/16" hex size is a little less popular, so make sure you have the right wrench.

All things considered, Champion RJ19LM is an excellent replacement spark plug. It will be able to fit many different customers looking to put the plug into many different vehicles. Plus, the company is probably the biggest name in the business.

Review of Champion RJ19LM (868) Copper Plus Spark Plug

Additional Info

    Manufacturer


 

What Is a Spark Plug?

A spark plug is a device that delivers the electric current from the car's ignition system to the combustion chamber present in any spark-ignition engine. It ignites the compressed fuel-air mixture using an electric spark, all while keeping the combustion pressure "locked" within the engine. A plug like that will have a metal-threaded shell that is electrically isolated from its central electrode with a porcelain insulator.

Now, it is all very technical and there's a decent chance you're already familiar with these basics and don't necessarily need our help in that regard. As far as the selection part is concerned, there are many things that differentiate quality plugs from subpar products.

Any ribbed insulator design will always prove a good place to start as it will be able to prevent the flashover issue that so many mediocre plugs have been known to cause and/or fail to mediate. You can never go too wrong with fine wiring tips as these little components excel at reducing the required voltage. All in all, as long as the plug is able to offer reliable cold starting and quick acceleration, you shouldn't have too many issues making it work.

Using OBD2 scanners, you'll be able to inspect your car anytime, anywhere. New jumper cables will not necessarily hurt too, so you might want to consider adding them to your shopping cart.

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Publish Date: 2019-05-31 12:15:48