Best Spark Plugs

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.

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.

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.

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.

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.