You should consider various factors when upgrading your spark plugs, especially if going for aftermarket products. Top of your considerations should be spark plug material, with options like copper, platinum, ruthenium, and iridium.
The last two ensue a fierce debate, ruthenium vs. iridium spark plugs, among the automobile mechanics and owners. You might want to use ruthenium or iridium plugs if you are looking for resilient components suitable for high-performance applications.
An in-depth look at the two spark plugs will reveal the key differences. While ruthenium belongs to platinum group, iridium resists friction the best. They also differ in price and iridium electrodes spark plugs are more expensive than their ruthenium counterparts.
Let’s walk you through an in-depth analysis of the pros and cons of the said spark plugs. Read on.
Function of Spark Plugs in the Ignition System
Before looking at the two different spark plug types, it is prudent to understand the key role of spark plugs in the ignition system. The spark plug’s design incorporates various elements that contribute to its overall functionality, mainly park provision in the combustion chamber. The primary components are the shell, electrodes, and insulator.
The shell is the plug’s metallic housing that provides structural support and electrical grounding. It contains threads that ensure a firm seal when fitted into the combustion chamber. The ceramic insulator separates the electrodes from the shell, preventing short-circuiting and electrical leakage.
Spark plugs have two electrodes, the center and side or ground electrodes. The center electrode connects to the terminal via an internal wire and assumes the role of a cathode, as it emits electrons. This electrode is typically the hottest part of the spark plug; thus, it is easier to generate electrons.
The ground electrode emerges from the shell and extends to the other end of the plug, where it meets the center electrode. Most spark plugs have one side electrode, but there can be as many as four.
Having many side electrodes translates to longevity. The main downside of multiple side electrodes is the resultant shielding effect, which may lead to a shielding effect, causing a weaker burn and poor fuel economy.
The gap is the space between the ground and center electrodes, and its size is responsible for the spark’s heat and intensity. Some spark plugs may have insulation ribs for heat dissipation and electrical insulation.
Spark Generation
How do spark plugs work? They get electrical current from the spark plug wire coming from the ignition system. When the electrical current reaches the plug, it ionizes the air-fuel mixture in the gap, creating a conductive path that allows for current flow, generating an electrical spark. This spark initiates combustion in the combustion chamber.
Apart from spark generation, spark plugs are also crucial for heat dissipation. The ceramic insulators transfer heat away from the combustion chamber.
What Is Ruthenium Spark Plug?
We start our comparison with ruthenium spark plugs, whose popularity is immensely growing courtesy of their impressive ignitability. The ignitability of these spark plugs guarantees maximum combustion, translating to excellent power generation and fuel efficiency. Furthermore, they ensure minimum emissions, which is good for the environment.
Durability is the other selling appeal of the ruthenium plugs. They are primarily built from ruthenium, a precious metal in the platinum group, which is very hardy. The spark plugs are resilient and resistant to electrical corrosion and erosion.
The standard ruthenium spark plug lifespan is in the neighborhood of 100000 miles. You can use them for a long time without worrying about replacements.
The durability and resilience of these spark plugs make them perfect for high-performance vehicles. Unlike ordinary plugs, rutheniums have a relatively low voltage requirement, which won’t stress the ignition system.
Presently, NGK, a leading spark plug brand, is among the few names dealing in such spark plugs. NGK ruthenium spark plugs are products of the brand’s proprietary ruthenium technology. Two types of plugs are under this category: the HX double fine electrode (DFE) and projected square platinum electrode (PSPE). The former is ideal for low-heat engines, while the latter targets engines producing more heat.
Pros of Ruthenium Spark Plugs
Ruthenium spark plugs are among the most reliable, guaranteeing a long service life courtesy of their robust construction. With a 100000-mile lifespan, you save on constant replacement costs.
Here is a summary of the perks of ruthenium spark plugs.
- Impressive ignitability, translating to boosted engine performance
- Durable and resistant to electrical corrosion and erosion
- Compatible with various vehicles, particularly the performance-oriented types
- Assurance of complete combustion; thus reduced emissions and excellent fuel economy
- Resistant to high temperatures, courtesy of a high boiling and melting point
Cons
Ruthenium plugs are costlier than traditional spark plugs. The price is justifiable, considering the quality of the material and overall performance. The other downside is that getting the plugs can be challenging, as the technology is still in its crawling stages. While designed to work with various cars, ruthenium spark plugs may fail to work adequately with some models.
What Is Iridium Spark Plug?
Iridium spark plugs have a center electrode built from iridium, one of the densest metals in the platinum group. The sturdiness of this material boosts the service life of the spark plugs, with a lifespan extending past 100000 miles.
A definitive feature of these spark plugs is their small electrode tip. The small end requires low voltage to ignite a spark; hence, there is less stress on the ignition unit. Additionally, iridium plugs have high ignitability, which is crucial for complete combustion in the chamber. Optimum combustion guarantees engine power, reduced fuel consumption, and low emissions.
The robustness of these plugs makes them an excellent fit for high-performance vehicles. They can withstand the high heat and pressure in the engines of such cars without wearing out.
Iridium spark plugs have been around for a while, and brands such as NGK, Bosch and Denso stock them.
Are double iridium sparks better? Double iridium spark plugs are mainly produced by Bosch and feature an iridium firing pin and ground electrode. The laser-welded iridium enhances the spark plugs’ performance, up to four times that of ordinary copper plugs.
Pros of Iridium Spark Plugs
Iridium spark plugs stand out from ordinary plugs due to their high boiling and melting point, which are responsible for their robust operation. These spark plugs can withstand high operating temperatures and electrical corrosion. They are ideal for extreme-performance vehicles, as the heat the engines produce is manageable.
Here are other advantages of iridium spark plugs.
- They are compatible with most vehicles, especially high-performance ones
- High ignitability
- The spark plugs promote fuel efficiency and emission control
- A long lifespan of over 100000 miles
- Low voltage requirements; thus, enhance ignition system health
Cons
Iridium spark plugs are among the priciest varieties, costing even more than other precious metal plugs like platinum and ruthenium. While they have been around for a considerable time, their availability is pretty limited, with only a few brands stocking them.
Ruthenium vs. Iridium Spark Plug Differences
The central part of this discussion looks at how these two types of spark plugs contrast. We can see they have several similarities, such as being precious metals with high boiling and melting points, which is crucial for their high-performance applications. Let us look at their differences to see which stands out in various facets, as highlighted below.
1. Performance
You judge a spark plug’s excellence by its performance, and we can see that both ruthenium and iridium plugs bring their A-game. They have high melting and boiling points, with iridium’s values being slightly higher than that of ruthenium, specifically the melting point. The two spark plug materials can withstand high heat, which makes them ideal for performance-oriented cars.
With a higher melting point, Iridium will do well in such vehicles, extending its excellence to supercharged and turbocharged engines. Platinum vs. iridium vs. ruthenium spark plugs, how do they fare in performance? All the materials are platinum group metals and offer better functionality than traditional copper spark plugs. Platinum is the least performer, and it may be a close tie between iridium and ruthenium plugs, with iridium having a slight edge courtesy of its heat resilience.
2. Ignitability
Not veering far from performance, we compare ruthenium vs. iridium spark plug ignitability, where we look at how well they light up the air-fuel mixture in the combustion chamber. Both iridium and ruthenium plugs perform well in combustion and are renowned for their high ignitability.
Iridium is the victor in ignition capability due to its thin electrode point, which provides a concentrated spark. On the other hand, ruthenium plugs offer reliable and consistent sparks, even in challenging conditions, making them ideal for cold starts.
3. Durability
Ruthenium and iridium are robust metals, a quality they pass to their respective spark plugs. The two plugs are durable and will serve you for ages before prompting a replacement. As per brand reports, ruthenium plugs have a longer lifespan than their iridium counterparts, with both having values around 100000 miles.
Ruthenium plugs can clock more than 100000 miles, though this is still a claim as they are still new in the market. Iridium plugs can run between 60000 and 110000 miles, depending on the brand and vehicle. We have to wait and see if ruthenium plugs live up to the hype of longevity.
4. Fuel Efficiency
Good spark plugs will enhance fuel efficiency, which is precisely what iridium spark plugs do. They beat their ruthenium counterparts due to their great ignitability, boosted by a small electrode tip. The ignitability also enhances emission control.
5. Design
Both iridium and ruthenium plugs come in multiple designs to meet different operational needs. The standard design is the center electrode features either metal. Ruthenium spark plugs can be double fine electrode (DFE) or projected square platinum electrode (PSPE).
Ruthenium DFE plugs work well with low-heat emitting engines and are suitable for regular vehicles. On the other hand, PSPE plugs are ideal for hotter engines, like those in performance-oriented automobiles.
Regarding iridium spark plug designs, there is the standard and laser or double iridium spark plug that has two electrodes and is suitable for high performance. We compare the PSPE to the double electrode spark plug on the ruthenium vs. laser iridium spark plugs debate. The two are great if you are targeting more engine power.
6. Cost
The iridium vs. ruthenium spark plug price consideration will help you pick between the two. Iridium spark plugs are typically costlier than rutheniums. The steep price is possibly due to the metal’s high quality and superb functionality.
7. Customer Reviews
What do customers think about ruthenium and iridium spark plugs? Customers rate them highly, primarily because of their stability. You can check out this comment in this forum about the iridium plugs’ impressive functionality, highlighting its 100000-mile+ service life.
On an R8 discussion about ruthenium spark plugs, this contribution discusses how good they are on cars. Several forums talk about the two types of spark plugs, and you should check them out to understand their functionality.
Here is a summary of ruthenium vs. iridium differences
| Feature | Ruthenium | Iridium |
| Metal group | Platinum | Platinum |
| Melting point | 4233 degrees Fahrenheit | 4435 degrees Fahrenheit |
| Boiling point | 7502 degrees Fehrenheit | 7466 degrees Fahrenheit |
| Available designs | DFE and PSPE | Standard and laser (double iridium) |
| Lifespan | Around 100000 miles | Around 100000 miles |
| Cost | Cheaper then iridium | Pricey |
Frequently Asked Questions
Is Ruthenium Better Than Iridium?
Ruthenium is better than iridium in facets like affordability and corrosion resistance. Also, there are claims that it has a longer lifespan, but they are yet to be proved, as ruthenium plugs are still new in the market.
How Long Do Ruthenium Spark Plugs Last?
Ruthenium spark plug lifespan is one of its redeeming factors, and it can serve you for more than 100000 miles. According to many customers, the lifespan is still a claim as ruthenium spark plugs are still new in the scene, and most are yet to reach the 100000-mile mark. However, the claim might be valid considering the performance of these engine components.
What Is The Highest Quality, Longest Lasting Spark Plug Made Of?
You should consider ruthenium or iridium if you are looking for quality and durable spark plugs. The two materials are platinoids, lauded for their impressive resiliency. According to NGK, its ruthenium plugs can last for more than 100000 miles while its iridium plugs last for 50000 to 60000 miles. NGK laser iridium spark plugs have an 80-100k mile range.
Regarding quality and durability, ruthenium is a sure bet, plus it is more affordable.
Are Ruthenium Spark Plugs Worth It?
Ruthenium spark plugs guarantee the best service, especially if you own a performance car. They are robust with high boiling and melting points and can withstand the heat and pressure from your engine without degrading.
Furthermore, they are affordable than their iridium counterparts and can last you for more than 100000 miles.
Why Is Ruthenium So Valuable?
Ruthenium is a precious metal under the platinum group. This metal is hardy and does an excellent job when used on spark plugs, granting it resistance against electrical corrosion. It is quite rare, which contributes to its value.
Are Ruthenium Spark Plugs Pre-Gapped?
Gapping refers to sizing the spark plug appropriately to meet your engine specifications. Ruthenium spark plugs are pre-gapped; thus, you don’t have to adjust the gap when you buy them.
What Type Of Spark Plug Is The Best?
The ruthenium vs. iridium spark plugs comparison looks at some of the best spark plug materials that guarantee long-lasting service. When picking between the two, iridium plugs are ideal for the best ignitability, though they beat their ruthenium counterparts by a slim margin. They are also highly available, with many brands stocking them.
Ruthenium plugs are more affordable, translating to an excellent bargain considering their durability and corrosion resistance. Pick the best between the two and ensure you go for a reputable brand.