Spark plugs are essential components for generating the spark required to ignite the air-fuel mixture in the combustion chamber.
This is done by means of an electric current that is conducted to the plugs. The heart of the spark plugs is the side and center electrodes.
At one point in time, the electrodes were made of copper, which was later converted into platinum or iridium. This has led to manufacturers making plugs from all three of these materials. Choosing one of these materials can be confusing if you are not an expert.
When searching for the right spark plug, you must take into account its conductivity. Plugs need an electric current to produce a spark for ignition. One of the best conductors for electricity is copper.
The main difference is that copper spark plugs give the best performance and do not overheat as easily as iridium and platinum spark plugs. Platinum spark plugs have a long service life, but low power. Iridium spark plugs are the most expensive and have a long lifetime and a pretty good performance.
Copper spark plugs
When it comes to electrical conductivity, nothing beats copper. That’s what made copper spark plugs one of the best. In copper spark plugs, a nickel alloy is used for the center electrode. The disadvantage of the nickel alloy is that it is soft, which makes it not very durable.
In addition, it needs a lot of voltage so that the current can flow. Older cars still use copper spark plugs because their electrical requirements are not very high.
The reason why most manufacturers use metal on the sides and in the middle of the electrode is the low melting point of copper. Electrical current is passed through the spark plug body and a spark is created between the gap between the middle and side electrodes. If you are unsure, refer to your service manual to find the correct spark plug specifications for your engine.
The spark is vital to the combustion of air and fuel. The use of metals such as platinum and iridium delays the spark and reduces the risk of misfiring.
Advantages of copper plugs
- Plus are readily available and cheap.
- Plugs have a fast cooling rate that boosts performance.
- Mostly used in older cars.
- Wear out fast at less than 20,000 miles.
Iridium spark plugs
If you are looking for spark plugs that last longer, iridium plugs are the best choice. Iridium is harder and more durable than copper or platinum, but more expensive. In addition, the plugs are perfect for a power-hungry car because the center electrodes are small.
This means that it needs less current to produce a spark. The trend is slowly moving towards greater use of iridium spark plugs.
- The highest melting point of the three plugs.
- Last longer than platinum and copper.
- Most expensive.
Platinum spark plugs
The platinum plugs last longer than the copper plugs, but not as long as the iridium plugs. A platinum disc is melted on the tip, which makes the plugs resistant to deposits. The plugs are suitable for car owners with electronic distribution systems.
In addition to the normal platinum spark plugs we also have the double platinum spark plugs. This eliminates the probability of a wasted spark.
In such cases, your platinum spark plugs will ignite twice: once in the exhaust stroke cylinder and again in the compression stroke cylinder. This spark in the exhaust stroke cylinder is often wasted.
- Long-lasting: can be used for up to 100,000 miles.
- They do not overheat easily.
What will happen if you do not replace the spark plugs?
Spark plugs are indispensable for generating the necessary ignition spark to ignite the fuel and air mixture. However, depending on the type of your plugs – platinum, copper or iridium – you may be forced to change them earlier.
During routine maintenance, you should change the oil filters, engine oil, fuel filters, but you should also check the condition of your spark plugs. The plugs should be changed at intervals of between 30,000 and 50,000 miles. Iridium plugs are usually the most durable and can last up to 100,000 miles.
But when will you know that your plugs have outlived their useful purpose? You can learn more in-depth symptoms of bad spark plugs here.
A worn plug will not send the required charge to the combustion chambers. This means that one of the car’s combustion chambers is not working as usual. Most modern engines have on-board computers that regulate the current to the spark plugs. In this case, the slow acceleration could be due to a defective sensor. Clogged fuel injectors or dirty air filters can also cause slow acceleration. Your mechanic can identify the exact cause of the problem.
When you start having problems with engine misfiring, the culprit is often defective spark plugs. To ignite the fuel-air mixture, the combustion chambers need a charge provided by the spark plugs. The wires connected to the spark plugs could also be damaged, causing the incorrect current to flow.
If your engine misfires, you will hear stuttering or tripping noises from the engine block. This leads to an increase in exhaust fumes and reduced mileage.
High fuel consumption
Since the fuel in the combustion chambers does not ignite completely, you will notice a decrease in gas mileage. If the spark plugs are defective, the gap between the side and center electrode is often too large or too small. This means that no charge is generated for combustion.
In this case, you do not necessarily have to buy new plugs. You can remove existing plugs and either widen or narrow the gap between the electrodes according to the manufacturer’s settings.
Problems starting the car
A well functioning engine should come to life the moment you turn on the ignition key. If your plugs are worn out, you will find that you need to turn on the ignition several times before the engine starts. You may also have problems with your alternator.
Spark plugs are not designed to last forever and should be checked occasionally for wear.
Spark plugs are necessary for effective combustion of the air-fuel mixture. For a very long time, only copper spark plugs were available. While copper is a good conductor of heat, the plugs wear quickly and must be replaced every 20,000 miles.
Platinum spark plugs have a long service life and eliminate the probability of a waste charge. Iridium spark plugs are the best plugs because of their durability but are more expensive than platinum and copper spark plugs.
Hello I’m Magnus, the owner and the writer of this website. I have been working with cars since I was 16 and I’m specialized with in-depth Automotive diagnostics. Also been driving drifting for the last 6 years. I’m here to give you answers to all your automotive questions and I hope that you enjoy our content.