Best Spark Plugs for Racing: Reviews 2021 (Recommended!)

by Chris Lewis.

Despite its small size, a spark plug is one of the most important components of any car engine. That is why choosing a replacement for it can be a bit tricky given all the options you have.

Do you think your race car engine is in need of a spark plug replacement? If it is, no need to worry because we are here to help!

We have done our research and come up with a list of the 8 best spark plugs for racing. Not just that, we have also included a buying guide and answered some questions you may have about this.

Without any further ado, let us get to it!

Image Name Ratings
Bosch Automotive 9723 Iridium Spark Plug
Price Check
4.5 / 5.0
4 New NGK Laser Iridium Racing Spark Plugs RE7CL RE9BT Mazda RX-8 1.3 R2
Price Check
4.8 / 5.0
Autolite AR3910X Racing Spark Plug
Price Check
4.6 / 5.0

Top 8 Best Spark Plugs for Racing

When you are racing, you need everything to be in good shape and condition, which includes your spark plug as well. This is why you need the best product for the job. Here, we have put together a list of a few spark plugs that we believe are the best for racing.

 Top 8 Best Spark Plugs for Racing
Top 8 Best Spark Plugs for Racing

1. Bosch Automotive 9723 Iridium Spark Plug

Bosch Automotive 9723 Iridium Spark Plug
Bosch Automotive 9723 Iridium Spark Plug

The first product on our list is the Bosch Automotive 9723 Iridium spark plug, where its manufacturers are known for their quality and reliability. These are made to be able to not only provide you with great performance but also a long time of service.

First of all, this thing has an ultrafine wire Iridium center electrode pin, which does an excellent job of giving you the greatest performance.

It has a nickel-plated shell featuring rolled threads and does not require any anti-seize. Not just that, the shell even offers protection from corrosion.

This thing does not require high voltage, thanks to the fine wire firing pin. There is a copper core electrode that offers much better heat transfer when needed. It also has a ribbed insulator design, which does a good job of preventing any flashover.

Moreover, this here is a highly durable product that has been made using 360-degree continual laser welding to make it easy to fuse the firing pin.

Overall, this is a great product worthy of praise. It delivers excellent performance and offers great ignitability. If you are looking for something to replace your old spark plugs, you should definitely check this one out.


  • Excellent ignitability and performance
  • Quite durable
  • Nickel shell offers protection from corrosion
  • No gapping needed


  • Complaints about some spark plugs not being authentic

2. 4 New NGK Laser Iridium Racing Spark Plugs RE7CL RE9BT Mazda RX-8 1.3 R2

4 New NGK Laser Iridium Racing Spark Plugs RE7CL RE9BT Mazda RX-8 1.3 R2
4 New NGK Laser Iridium Racing Spark Plugs RE7CL RE9BT Mazda RX-8 1.3 R2

This product on our list is quite a popular one among many users of Mazda RX8. If you are looking for the best priced quality spark plug for your race car, this can be just what you need.

NGK spark plugs are said to last about 25% longer than almost any other spark plugs. This particular product here is no exception to that. Here, the components are made using iridium and have fine thread electrodes that help make this thing very efficient.

If you want your race car to run better with more power, this spark plug is perfect for that job.

This thing has gotten many positive reviews from users, and with good reason. The manufacturers of this product gave it a 0.6mm thread with an iridium tip.

This tip not only makes sure the spark plug is durable, but it also features an electrode that reduces the effects of electrical quenching.

These spark plugs do an excellent job at improving your car's ignition and work to increase your acceleration.

For the price, you may not get a better product for your sports car. These low maintenance and affordable spark plugs offer great performance and promise reliability.


  • Very affordable
  • Great quality and reliable
  • Increases acceleration
  • Quite durable


  • Does not fit all car applications

3. Autolite AR3910X Racing Spark Plug

Autolite AR3910X Racing Spark Plug
Autolite AR3910X Racing Spark Plug

Autolite Racing Spark Plugs are well-loved by many professional race car drivers, and this particular model is no different. It is the perfect one to go for if you have a Honda, Predator, or an Animal racing engine. This thing is powerful enough to outmatch any stock plug that you get with these engines.

Like the others from this line, the AR3910X model also contains a Yttrium-Enhanced Alloy that enhances durability with less pre-ignition. This is done by allowing up to an 8 percent reduction in side-wire temperature.

These can also be found designed for colder heat ranges so that there is room for performance modifications and handling more intense situations.

You will not need to worry about corrosion either, as this thing is coated in an anti-corrosive nickel plating.

This thing will make sure your car runs much more smoothly with better mileage. With the cut background electrode, you will notice that the ignitability is better, and there is a faster flame kernel growth.

All in all, this is an excellent spark plug that is perfect for racing. If you are looking for a good quality product that is also reliable, this can be just the thing you need. So, what are you waiting for?


  • Great quality product
  • Ideal for Honda and predator motors
  • Quite durable
  • Anti-corrosive nickel plating to prevent rust


  • A bit expensive

4. NGK 7090 BKR5EGP G-Power Spark Plug

NGK 7090 BKR5EGP G-Power Spark Plug
NGK 7090 BKR5EGP G-Power Spark Plug

Are you looking for an affordable but durable spark plug? Well, then your search is over because the NGK7090 BKR5EGP is just that. This G-Power spark plug will boost your car's performance and improve fuel efficiency with many fast starts.

First of all, this thing features a 0.6mm laser welded fine Platinum tip that decreases the required voltage. This results in higher durability and keeps the spark consistently stable.

These are designed to provide the best performance to your engine without costing too much. You will find that your mileage and startup has improved, with a reduction in auto emissions.

To reduce flashovers and boost the throttle response, the manufacturers have made sure to include a specially designed insulator nose with corrugated ribs. Much like the previously mentioned products, this one too is resistant to corrosion, thanks to the trivalent metal plating.

It also has a triple gasket seal, which means you will not need to worry about combustion gas leaks.

These spark plugs have been made using some of the best materials that make sure the electrodes stay sharp for a very long time. Not just that, these things are said to even prolong your engine life by reducing the chance of pollutants getting into the engine.

Even though they are made to be used on any application, you should still check for compatibility before getting one of these for your car.


  • Quite affordable
  • Long-lasting
  • Does not require maintenance
  • Boosts engine life


  • Complaint about the product being cheaply made

5. Denso (4504) PK20TT Platinum TT Spark Plug

Denso (4504) PK20TT Platinum TT Spark Plug
Denso (4504) PK20TT Platinum TT Spark Plug

Much like the previous product, if you are still looking for the best spark plug for racing that is also inexpensive, then the Denso 4504 might just be the one for you. This is a solid, all-rounder spark plug that will offer you excellent performance and great durability.

To begin with, this thing has a dual platinum construction and features a twin tip technology with an 11 mm platinum center electrode and an 11 mm titanium ground electrode.

You will find that these plugs give a reliable spark, resulting in smooth combustion of air and fuel mixture. This means that you will get better fuel efficiency, greater acceleration, and quicker starts with a more reliable engine.

Not just that, it even features a purified alumina powder insulator, which is used to increase thermal conductivity to boost longevity. So, the material can go through extreme stress without getting heavily affected.

One issue to note here is that the gap on some of the plugs seems to have been set incorrectly. Just make sure you take a good look at it and adjust it the correct way.

However, it is not the biggest issue when you look at how great the spark plugs are. For the incredibly affordable price, you will hardly find a better spark plug. So, do make sure to check out this product before making a purchase.


  • Features a twin tip technology
  • Offers smooth combustion and faster starts
  • Inexpensive
  • Purified alumina powder insulator increases thermal conductivity


  • Gap on some plugs may be incorrectly set

6. Champion Copper Plus 570 Spark Plug

Champion Copper Plus 570 Spark Plug
Champion Copper Plus 570 Spark Plug

Champion spark plugs are known to significantly improve the performance of your car, and the 570 model is no different. With this, you will be getting a great quality product at quite an affordable price.

This thing has a copper core center electrode that allows much better control of the plug's heat range, resulting in more consistent engine performance and boosts longevity.

You will not have to worry about corrosion either, as it has an ultra-seal coated shell that fights against rust. To give you the best of performance, this thing has been made to ISO and SAE standards.

The manufacturers of this product have included a SAC-9 semi-conductor resistor, which helps with suppression. Even the spark focus is much sharper, thanks to the electrodes made of platinum alloy.

There is not much flashover with this thing, and it even improves throttle, and all of this is due to the corrugated insulator nose. The SAC-9 semi-conductor resistor actually helps suppress radio frequency, which is good since it can create issues with the car's electronic components.

Overall, these spark plugs are absolutely great. They have been specially made for older components to boost engine performance and improve mileage. Not just that, the spark plug also gives better acceleration.


  • Will last quite a long time
  • Improves mileage and boosts engine performance
  • Allows higher control of plug's heat range
  • Sharp spark focus


  • May produce misfire error codes

7. E3 Spark Plugs E3.111 Premium Racing Spark Plug

E3 Spark Plugs E3.111 Premium Racing Spark Plug
E3 Spark Plugs E3.111 Premium Racing Spark Plug

Performance is one of the most important things to consider when buying the best spark plug for racing. Luckily, the E3.111 premium racing spark plug does not disappoint in that case. This model is truly one of the best, and after the end of this review, we hope you will agree!

First things first, this spark plug can be used as a replacement for a wide range of racing applications. This thing has been designed to provide you with more power and a reduced fuel combustion rate.

Not only will you get faster starts, but also a much smoother acceleration, which will only improve your racing experience.

Here, the ground electrode gives quick flame propagation, which ensures the total burn of your fuel and air mixture and thus, results in much smoother acceleration.

This thing has a pure copper core, which means that not only is it highly durable, but it can also transfer heat much better and faster.

Misfires can cause some serious problems, so to prevent that, this plug features multi-rib insulators. It has been designed to have some room for performance modifications.

With this thing, you will find that your car starts just as quickly as it runs well. However, this increase in power does come at a cost. As good as the spark plug is, it can also be a bit expensive. If you think that will not be an issue for you, do consider getting this plug for your vehicle.


  • Offers smooth acceleration
  • More power and lower fuel combustion
  • Prevents misfires
  • Quick start


  • A bit expensive

8. Autolite APP104 Double Platinum Spark Plug

Autolite APP104 Double Platinum Spark Plug
Autolite APP104 Double Platinum Spark Plug

Finally, the last product we have for you is the Autolite APP104 double platinum spark plug. This is an affordable spark plug that is perfect for everyday car use. If you are looking for a good and inexpensive spark plug, you can give this one a shot.

You will likely not face any gap issues here as this thing has a full platinum tip, which makes sure there is no gap erosion.

To boost fuel economy and ensure a longer engine life, this plug does a good job of improving the engine performance. With just one look, you will see that it is quite a high-quality product.

There is a necked-down center electrode that fires pretty quick and clean without using a lot of voltage so that the start can be easier and faster. Not just that, this ensures even the acceleration is smoother and faster.

It has an iridium-enhanced 0.6mm fine wire design with a platinum side wire technology, which helps enhance durability and improve ignition, resulting in an overall performance boost.

This is truly a very good product that does not leave much room for disappointment. The best part is that it is incredibly inexpensive, so it is perfect for anyone on a budget.


  • Improves fuel combustion and boosts performance
  • Very affordable
  • Quick and easy start
  • Made using good quality materials


  • May not be best for racing

What to Look for While Buying Best Spark Plugs for Racing?

Now that you know all about these products, you probably have an idea of which spark plug you want to buy. However, not all spark plugs are exactly the same, and so there are some things you need to consider before you go out and buy one.


One of the most important things to look out for is the material used to make the spark plug. Copper is usually the ideal choice and what most of the standard plugs are made of. That is why if you have a car of an older model, you should probably go for a copper one.

You can find out what type of spark plug you need from your owner's manual for the engine. The other types of spark plugs are platinum and iridium, which are best suited for more modern engines that do not have distributors.

Platinum is a good choice when it comes to performance, durability, and cost. Although iridium plugs are the best at everything, they are also the most expensive.


There are some spark plugs that are just made to be more durable than others. When buying a new one, you obviously do not want a plug that will need to get replaced after a short time of use.

So, you should go for something that is well made and will last longer. For that, platinum or iridium plugs are a better choice due to their premium coating, which makes them wear-resistant.

Heat Range

You will see that a spark plug that is a good heat insulator is classified as 'hot.' On the other hand, if it is referred to as 'cold' then it is able to transfer more heat out of its tip and lower its temperature.

Usually, there is a number to show the heat range of the product, where some use descending numbers for colder plugs while the others go the other way around for the hotter plugs.


The gap of a spark plug is basically the space between the center and side electrodes of each plug.

This is a very important thing to consider when trying to figure which spark plug to buy. So, try to pick one with a fixed gap; otherwise, just make sure to adjust the gap on each plug before you install them.

How to Install a Spark Plug?

Installing a spark plug does not need to be difficult. If you are unsure, we prepared a short guide and some steps that you can follow.

Step 1: Wipe the Spark Plug Hole Completely Clean

The very first thing you need to do is take a freshly washed dry cloth and wipe away from the spark plug hole.

Step 2: Coat the Threads of the Plug

Next, you need to take just a bit of oil and lightly coat these threads in the plug. Just make sure you do not get any on the electrodes.

Step 3: Thread the Plug in with Care

Take the plug and start threading it into the engine, turning it in a clockwise motion. Make sure you do it by hand to avoid ruining the threads.

Step 4: Engage

Turn at least two whole turns.

Step 5: Slip in the Plug Socket Over the Spark Plug

Make sure you do not plug it in too tightly. When you secure the ratchet, follow up by continuing to rotate the plug in a clockwise motion till you feel resistance.

Step 6: Inspect

Lastly, give the plug a quick little inspection to see if everything is alright. Measure the gap in your spark plug or see if the cable seems frayed or worn, in which case you should replace it.

After that, take some lubricant and apply it inside the boot before pushing it over the terminal and pressing it in position.

Racing Spark Plugs vs Regular: Which One Should You Buy?

Spark plugs are usually more or less the same. However, they can have some defining features and clear differences. The same holds true when you compare racing spark plugs with regular ones. What type of spark plug you need depends on your vehicle and what you intend to use it for.

For racing, a racing spark plug would be a better choice. This is because the racing ones are able to endure more mechanical and thermal shock. The electrodes in these plugs are specially made to enhance sparks.

This means not only is there greater combustion reliability, but it also delivers more power due to having lower resistance.

As a result, you get a more powerful spark with a smoother ignition and complete combustion. However, the electrodes used here tend to be made of more expensive materials such as platinum or iridium.

Final Words

Well, that is pretty much all you need to know about these spark plugs. Did you find any that you liked? Carefully go through each of the products before you make a decision.

We hope with this list of the best spark plugs for racing, you are able to find one that is just right for you. Good luck!

About Chris Lewis.

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