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How Many Spark Plugs In A V8 Engine? (+5 FAQs)

March 23, 2022

Want to know how many spark plugs in a V8 engine?
Most V8 engines have eight spark plugs

However, it’s not always that simple. Some can have sixteen spark plugs, depending on the engine design.

So in this article, we’ll discover how many spark plugs a V8 engine has and how to tell if you have a twin spark engine (which has something to do with those extra spark plugs). 

We’ll also answer some FAQs about spark plugs, like how to tell if you have faulty spark plugs, how often you should replace them, and more.

This Article Contains:

How Many Spark Plugs In A V8 Engine?

Whether you have a Dodge Charger, a Chrysler, a Mercedes AMG, or an Alfa Romeo, the total number of spark plugs in your car’s engine depends on two things: The type of engine and the number of cylinders you have. 

Most V8s have eight spark plugs — one per engine cylinder. 

However, twin spark engines with no distributor, and newer HEMI engines with MDS (Multiple-Displacement Systems), will have two spark plugs per engine cylinder — so sixteen in total.

Interestingly, this is only true for a gasoline engine. A diesel car’s engine utilizes a glow plug instead. A glow plug doesn’t ignite the air-fuel mixture in the diesel engine combustion chamber. Rather, superheated compressed air in each cylinder fires the fuel.

Therefore, you need to know what type of engine you have.

How To Tell If My V8 Comes With A Twin Spark Engine?

The easiest way to check if you have dual ignition technology in your gasoline engine is to look inside your owner’s manual. 

Alternatively, you can visually inspect your car’s engine. Here’s how:

Note: Earlier generations of the HEMI V8 engine utilized the ignition coil, distributor, and spark plug cables with one spark plug per cylinder. The modern 5.7 HEMI engine with 2 spark plugs per cylinder was introduced in 2003.

With that said, let’s check out how many spark plugs some common V8s have:

Car MakeNumber Of Spark Plugs In V8
2015 Ford Mustang GT8
2003 5.7L HEMI Chrysler 16
2003 Mercedes CL55 AMG16
2006 Dodge Charger R/T16
2008 Chevrolet Corvette8
2016 Ford F1508
2013 5.7L Dodge Ram 16

If you’re still unsure how many spark plugs your V8 engine has, ask your automotive dealership or a professional mechanic for help.

Now, let’s look at some FAQs on spark plugs.

5 FAQs About Spark Plugs

Here are five FAQs about spark plugs and their answers:

1. What Are The Signs Of A Faulty Spark Plug?

Here are some common problems associated with a bad spark plug:

If your plugs, the spark plug gap, or any electrical connector linking them to the ignition system is faulty, these tiny electrodes won’t do their job, and you’ll need a spark plug replacement. 

A bad spark plug won’t ignite the air-fuel mixture in your cylinder’s combustion chamber — causing misfires and making driving a challenge.

2. What Kinds Of Spark Plugs Are There?

You’ll typically find spark plugs made from these four different materials:

Note: When buying a new spark plug for your gasoline engine, it’s recommended you get an Original Equipment Manufacturer or OEM plug. Cheap aftermarket plugs can cost more than OEM spark plugs in the long run, as OEM spark plugs tend to have a better fuel economy.

3. How Often Do I Need To Change My Spark Plugs?

How long your spark plugs last depends on what type of spark plugs you have.

Check your owner’s manual if you’re unsure which plugs your V8 motor has.

4. What Are The Benefits And Drawbacks Of More Spark Plugs?

There’s no correct answer when it comes to wanting a dual ignition system or not. What matters is the engine design.

Generally, more plugs result in a cleaner burn — meaning increased fuel efficiency. 

However, modern single spark engines have a better fuel economy, fewer emissions, greater torque, and more horsepower than when Alfa Romeo invented dual ignition technology in 1914.

So, the benefits of having more of these electrodes in a V8 or V6 engine have diminished in recent years. Unfortunately, the increased cost of fixing a more complicated V8 or V6 engine hasn’t.

5. How Do I Replace Spark Plugs? 

Changing spark plugs yourself can be a DIY project. 

However, it’s always better to let your mechanic do it for you, especially if you don’t have any spark plug removal experience. Spark plugs can be notoriously difficult to detach after many miles in the engine, and a mistake could cost you a new cylinder head.

Here’s a general guideline for spark plug removal: 

Final Thoughts

Depending on your V8 engine, you either have eight or sixteen spark plugs. Consult your car owner’s manual or physically count the number of spark plug cables or coil packs your V8 motor has.

Once it’s time for a spark plug replacement, it can be a DIY project. However, you should always err on the side of caution and avoid changing spark plugs yourself to prevent damage to your car.

So how do you do that?
Well, you could always reach out to RepairSmith and let our ASE-certified technicians replace them for you.

RepairSmith is a mobile maintenance and auto repair solution with competitive and upfront pricing, available 24/7. And you can easily book us online.

Contact us now, and our mechanics will drop by your driveway and do a spark plug replacement in no time!