How Many Spark Plugs in a V8? Informative Guide

Is your v8 engine not functioning accurately? Do you think the spark plug are the main culprit? So, how many spark plugs in a v8 engine? This article will exactly tell you about the number of plugs is equipped for a V8 engine.

Most engines require a single spark plug for each cylinder. So, a V8 engine with eight cylinders will have eight plug. But, Hemi V8 engines require 2 spark plugs per cylinder. Thus, they need a sum of 16 spark plugs for one engine.

How will you know the quantity of the parts your engine has? It depends on the type of vehicle you own since cars’ engine varies from one to another. Read this post about this topic.

spark plugs in a v8 engine

How Many Spark Plugs in a V8?

Do you want a straightforward answer of the question? Then read the instruction manual. It is the fastest and easy way.

Twin Spark System

Most engines either come with dual ignition or a twin spark system. Twin spark engine is used many latest model engines such as Dodge, Mercedes, Alfa Romeo, etc.

So, the use of twin spark engines has what advantages? The twin-spark system burns the air and fuel mixture not only efficiently but also thoroughly. Hence, you gain maximum efficiency.

What’s more, it prevents engine knock and backfiring¬†since the maximum air and fuel mixture is efficiently consumed by the engine.

However, you spend double on a twin spark system than dual ignition because each cylinder needs two spark plugs. But still, you don’t have to break your bank account as it comes at a low price than other motor parts.

One of the most well-known engines is Chrysler’s 5.7-liter HEMI V8. So, how many spark plugs in v8 Hemi? The twin-spark system is used in this engine type. Two 5.7 Hemi spark plugs are required for each cylinder.

How many cylinders in a Hemi engine? This type of engine has eight cylinders, so 16 Hemi spark plugs are equipped for this engine.

Dual Ignition System

Earlier in 1914, most V8 motors would have a dual ignition system. Alfa Romeo was the first company who used it. Later, they introduced the twin spark engines for their automobiles.

Another Way to Learn How Many Spark Plugs

Wondering how many plugs are in a van? You can figure out it another way whether the engine has 8 or 16 spark plugs.

Raise the hood of your vehicle and locate the spark plug wires. Generally, each spark plug has a wire. So, eight wires mean 8 plug, and sixteen wires mean sixteen spark plugs.

In addition, give a close inspection of the ignition coil. A set of two spark plugs is remain in one ignition coil to provide sufficient power.

You can remove the ignition coil and check out whether two plugs are connected to a cylinder. If yes, they are dual spark plugs, and your automotive engine has sixteen in total.

How Often to Change Spark Plugs?

According to most experts, it is best to change spark plugs after completing every 30,000 miles. However, the manufacturer’s recommendation may vary. It could be more or less. Following the manual instruction is the best approach.

But few exceptions still exist. For example, you have not used your vehicle for several years, and you can’t remember the last time you have replaced spark plugs. In such a case, replacing those is better. You won’t experience engine failures.

Since spark plugs are inexpensive than other auto components, you don’t have to spend much. After changing the parts, take note of the mileage. Try to replace plug by following the equal interval based on the automaker recommendation.

How Many Spark Plugs in A Diesel?

The utilization of spark plugs on diesel engines is not necessary. What is the purpose of diesel engines not having plug? The answer is that diesel engines are different from gasoline engines.

The primary visible difference between these two engines is their different fuel. However, their internal functionality is not also similar.

A gasoline engine is supported by a spark-ignited system, while a compression-ignited injection system supports a diesel engine.

Besides, the combustion system for these two types of engines also varies. You can’t run a diesel engine without automation. However, igniting a gasoline-powered engine is possible regardless of its condition.

Do all cars have spark plugs? Most automobiles have spark plug. Only diesel automobiles don’t have any. Since diesel vans are disappearing, you can say most vehicles have either 4, 8 or 16.

Frequently Asked Question

Why do the V8 have 16 spark plugs?

A V8 engine features 8 cylinders, so 8 cylinders have 16 spark plugs with 2 for each of them. The primary reason for having more spark plugs for this engines is that it solves emission issues. Initiating two flame fronts from two plugs improves engine efficiency. It also guarantees complete combustion.

spark plugs in a v8 engine

How often should you change spark plugs?

It is best to follow the automaker instruction manual to clearly view the accurate time frame. The interval period may vary based on their spark plug quality and how they get contact while using the vehicle.

Where is the spark plugs in V8?

For most V8 engines, those are mainly located at the upper level of the cylinder top.

How Many Spark Plugs Does a Diesel Have?

A diesel engine doesn’t have any spark plugs as a compression-ignited injection system operates it.

Wrapping Up

Are you still thinking of how many spark plugs in a V8 engine? If your Hemi engine has a twin spark system, it will have 16 spark plugs for 8 cylinders. However, if your car has a dual ignition system, it will likely have 8 plugs for 8 cylinders. Hopefully, you got a clear view of this question from this article. Thanks for reading!


Shafiqule Islam is a graduated Mechanical Engineer. He has both on hand and managerial job experience of 15 years in automobile maintenance field. He served as Captain in Electrical and Mechanical Engineering Corp of Army, Technical Head in Taxi Cab business, Head of Plant in Car assembly plant. He is writing automotive contents to share his expertise knowledge to car lovers for solving their vehicle issues.

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