Best Spark Plugs – Top 5 Best Spark Plugs
Best Spark Plugs – MaintainYourRide Recommends:
Introduction – Top 5 Best Spark Plugs
Choosing the best spark plugs for your engine can have a profound impact on performance and efficiency. Fouled or damaged spark plugs can cause running lean/rich, misfiring, engine knock, and even lack of power in a particular cylinder. Any of these issues can cause the Engine Control Unit (ECU) to put the car in “limp-mode” where timing is severely retarded in order to protect the engine from further damage.
When changing your spark plugs, be sure to closely examine the combustion chamber/igniter side of each of the plugs. This can give a great indication of the health of your engine and how efficiently the ECU acting. As shown in the infographic below, there are many different stories your plugs can tell. If you notice severe damage such as oil on the plugs or melted/broken electrodes, we recommend you take your car to a local mechanic for immediate inspection.
Choosing the Best Spark Plugs
There are a few different things that you need to consider when determining the best spark plugs for your car, truck or SUV:
First, consulting your vehicle manual to determine the manufacturer recommendation for the type of spark plugs is very important. It may make the decision for you and drastically cut down on the amount of time you shop around.
If the manufacturer does not recommend a specific brand or type of plug, you have significantly more flexibility in your choice. Certain brands of plug have reputations for working better with different car manufacturers. For instance, NGK plugs have a reputation for working very well with Japanese vehicles – Honda, Acura, Toyota, etc as well as some older American-made vehicles. However, they don’t have quite the same reputation with European-made automobiles which tend to prefer Bosch plugs.
*** If you have a stock, unmodified engine, you don’t need to worry about this part. ***
The term Heat Range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. It has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. Within that range it is cool enough to avoid pre-ignition and plug tip overheating (which can cause engine damage), while still hot enough to burn off combustion deposits that cause fouling.
When a spark plug is referred to as a “cold plug”, it is one that transfers heat rapidly from the firing tip into the engine head, keeping the firing tip cooler. A “hot plug” has a much slower rate of heat transfer, which keeps the firing tip hotter.
A stock, unaltered engine will run within the optimum operating temperature range straight from the manufacturer, but making modifications such as adding a turbo or supercharger, increasing compression, timing changes, use of alternate fuels, or nitrous oxide, can alter the plug tip temperature, necessitating a colder plug.
In identical spark plug types, the difference from one full Heat Range to the next is the ability to remove 70°C to 100°C from the combustion chamber.
Iridium vs. Platinum vs. Copper Plugs
“Copper spark plugs” is a term mistakenly used for a standard material spark plug. A standard material spark plug traditionally uses a nickel-alloy outer material fused to a copper core. Almost all spark plugs use a copper core center to conduct the electricity, jump the gap, and promote heat dissipation.
However, as an outer electrode material, copper would not be a good choice, as it is soft and has a low melting point (resulting in a plug that would last minutes, not miles). Nearly all spark plugs, including precious metals iridium and platinum, have a copper core.
When one talks in terms of nickel alloys, platinum and iridium, one is referring to its durability, or how long a spark plug will last before it needs to be replaced. Platinum and Iridium plugs are significantly stronger and hold up longer.
Generally, Copper (Nickel-alloy) plugs ($) are standard durability (up to 40,000mi/65,000km), Platinum plugs ($$) have great durability (up to 80,000mi/130,000km), and Iridium plugs ($$$) have the best durability (up to 120,000mi/190,000km).
Top 5 Best Spark Plugs for 2017
Autolite has provided the automotive aftermarket and Original Equipment manufacturers the highest quality ignition products for over 100 years. These plugs are specifically designed for each application to meet or exceed OE quality and performance.
Autolite Iridium XP Spark Plugs have an iridium-enhanced 0.6mm fine-wire design and proprietary platinum sidewire technology, these spark plugs provide better durability and a more focused ignition for better overall ignitability and optimum performance.
Averaging over 4.5/5 stars from reviews around the web and about $5-7 per plug puts these on the high-end of the spectrum.
ACDelco Professional Iridium Spark Plugs are an ideal high-quality replacement for most vehicles. They are the latest in spark plug technology and a great replacement for your vehicle’s original components.
The design features iridium coating which provides smoother idle and improved performance. The fine-wire electrode provides better ignition of the fuel which helps to burn away carbon deposits from the plug which can cause premature wear.
Slightly lower average than some of the 4.5 star options, these plugs still rate very highly and are a great choice if you’re willing to spend a bit more to gain the increased longevity of iridium technology.
DENSO was a pioneer in Platinum Spark Plug Technology.
The Platinum TT originated from DENSO’s latest original equipment spark plug technology, the Super Ignition Plug (SIP). Until recently, this OE iridium Twin-Tip design could only be found in the most technologically advanced automobiles.
The TT features a Titanium-enhanced alloy ground electrode and a 1.1mm platinum center electrode. This provides enhanced flame propagation for increased engine efficiency as well as reduces quenching to generate a more powerful spark.
Over 4.5 stars from reviewers around the web, these plugs are a solid #3 option at $3-5 per plug.
The design features more platinum in the center electrode with two yttrium-enhanced ground electrodes which helps reduce gap wear and oxidation while providing a more powerful spark. Platinum+2 uses surface air gap technology. The spark first travels over the surface of the insulator nose and then arcs across the air gap to a ground electrode for a longer spark, without increasing the voltage requirement.
We examined hundreds of reviews and got an average of 4.8 stars. These affordable plugs are a great option if you want to save a few bucks ($2-4 per plug).
NGK is by far the most highly recommended brand of spark plugs by experts around the world. A large number of automotive manufacturers use NGK plugs from the factory which speaks to their reliability and performance.
NGK Spark Plugs feature a trivalent metal plating that provides superior anti-corrosion and anti-seizing properties. The Platinum coating provides great protection and durability giving these plugs a change interval of up to 60,000mi/95,000km.
These plugs have the highest rating with 4.8/5 stars over thousands of reviews from reviewers across the web. They are also extremely affordable with a price of approximately $3-5 per plug.
How to Install Spark Plugs
Installation difficulty of Spark plugs varies greatly depending on the application. Certain cars provide very easy access to the spark plugs making the job take less than 20 minutes with basic tools. Other cars are a bit more difficult based on things like crowded engine bays, the angle of the cylinder heads on the engine, and may even require special tools. We recommend searching Google or YouTube for a guide specific to your Make, Model and Year.
Generally, there are a few basic steps that apply to all Spark Plug change jobs and some common tools that you’ll need.
Tools: New Spark Plugs, Socket Wrench, Socket Extension, Spark Plug Socket, Anti-Seize Compound
Can Spark Plugs be Cleaned?
Technically, they can be cleaned. However, there is not much to gain from cleaning them. They are constantly being combusted inside the cylinders of the engine so most of the gunk on there is going to be burned on. With plugs as cheap as they are, there’s no reason not to just go ahead and replace the entire set if you notice some issues.
MYR Recommended Overall Best Spark Plugs – NGK G-Power Platinum Spark Plugs
MYR Recommended Value – Bosch Platinum+2 Spark Plugs
MYR Recommended Performance – Autolite Iridium XP Spark Plugs
You might also want to consider upgrading your car battery as well. Aging batteries sometimes provide inconsistent voltages which can adversely affect the performance of the engine and cause premature wear of the spark plugs. The Best Car Battery Buyer’s Guide is a great resource for finding the right battery.