How Many Spark Plugs in a V8? Simple and Quick Answer

You know that the spark plug is a very important part of a car engine. In internal combustion engines, spark plugs have a very important duty. But also people are curious about how many spark plugs are in a V8 engine. Here, you can find detailed and simple answers about this topic. And also we give extra information that you are seeking from us.

How Many Spark Plugs in a V8 Engine? Simple Answer: 8 in Most Cases!

How Many Spark Plugs in a V8
Image Source: Wikimedia.

V8 engine means that the engine has 8 cylinders that produce power. So, in each cylinder of the engine, ignition takes place. To provide this ignition, there must be an igniting source which we call to spark plug.

So every cylinder must have at least one spark plug. So this makes V8 engines have 8 spark plugs. But why we said, “in most cases”? Because different kinds of engines have double spark plugs for each cylinder.

What is the Difference between Double Spark Plug and a Single Spark Plug?

There is a reason that car brands are used double spark plugs for each cylinder or single spark plugs. The main difference comes from the efficiency of the engine. Because the ignition of the air-fuel mixture takes place more efficiently with two spark plugs. So, we can ignite less air-fuel mixture with two spark plugs that make the engine much more efficient.

Also, we can improve the accuracy of the more air-fuel mixture inside the cylinders. So, in some sports car engines, engineers are used double spark plugs. This is a very important thing to consider in general.

But also, there is a downside of the double spark plugs that we need to consider. The most important downside is the increased maintenance costs. Because the ignition system becomes more and more complex and maintenance becomes harder.

So while you are designing a sports car or a high-end car, you can add double spark plugs to the cylinders by exchanging the low maintenance costs. And if we think about that sports car owners do not care about slightly higher maintenance costs, some car brands made it.

So in a V8 engine, if you add double spark plugs for each cylinder, the total number of spark plugs will be 16. This is a very important thing to consider in general.

Why are Maintenance Costs Higher for Twin Spark Plug Systems?

To understand it, we need to understand how the ignition system of a car works in general. The working principle of the ignition system is very simple. There are spark plşugs that provide electricity to air-fuel mixture for burning. But the electricity must be provided inaccurate times.

To achieve it, we give the electricity with the help of a distributor system that gives the electricity at specific times to each spark plug. The distributor mechanism works with the help of the timing belt of the engine. As you understand that the timing belt “times” the sparking of the spark plugs in specific periods. So, it is very important to know the timing of the engine is very important.

Also, the distributor takes the electricity from the battery of the car. So there are cable connections between the distributor and battery, distributor and spark plugs. And if the number of spark plugs increases, the total number of cable systems and the capacity of the distributor mechanism increases. This makes the ignition system very complex system. And this increases the total maintenance costs of the general cars.

What are the V8 Engines That Have 16 Spark Plugs?

  • Mercedes CL55 AMG: Some models of Mercedes are generally known for the use of double spark plugs on the cylinders. And this model has V8 engines that have two sparkplugs for each cylinder which makes 16 spark plugs.
  • 2006 Dodge Charger R/T: Also Dodge is another important example of a high-end car manufacturer that uses double spark plugs in the engines. 
  • 2013 Dodge Ram 5.7L: RAM trucks are very common in the US. And they generally have very large engine capacities. This model has V8 5.7L engines that very commonly use twin spark plugs.
  • Jeep Grand Cherokee 5.7L: Another big off-road or SUV application that uses double spark plugs.

So, in general, the use of 16 spark plugs is common in the high-end section cars of the brands. So, they eliminate the question of “the maintenance costs” for the people who can afford them.

How to Count the Spark Plugs in an Engine?

It is very basic. You just need to counter the black plugs that are attached t the engine cylinder heads. These plugs are the system that provides electricity. And also these plugs are connected to the distributor system. And you can count the number of plugs on the distributor to find how many sparks plugs these engines have.

So it is very simple to this.

How Many Spark Plugs that Diesel V8 Engines Have?

Yes, it is a tricky question. But we need to state that diesel engines do not have spark plugs. They are working with glow plugs. Glow plugs are systems that have minimal coils that heat up when an electrical current goes through them. So, the working principle of diesel is kinda different.

So, there are no spark plugs in V8 diesel engines. Diesel engines have 8 glow plugs.

Last Words on How Many Spark Plugs in a V8

So this is the general information that we can state about this topic. We did not want to branch the topic too much more broad area. And we give the exact information that you need related to this topic.

If you have additional comments and questions about this topic, please leave them below. Your precious feedbacks are very important to us!


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Uğur Uygun

Hello everyone, I am Uğur. I am a mechanical engineer who has experience in different R&D departments of HVAC companies. With my best friend, I decided to build this website to share out knowledge and experience. And also, I am interested in automotive. So, I am writing about automotive and automotive-related articles here. Sharing my knowledge and experiences on these topics is a very big pleasure for me. I am willing to answer all of the questions people have about these topics.

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