Difference Between the Fuel Injector and Spark Plug [PDF]

Download the PDF below!

Hello readers, In the last article, we had discussed the Components and Classification of IC Engines whereas, in this session, we will be discussing the Difference Between the Fuel Injector and Spark Plug in a detailed way along with their definitions.

What is a fuel injector?

As the name indictes that it injects the fuel into the combustion chamber in suitable intervals.

In C.I Engine, there will be no spark plug and instead of it, the Fuel injector is replaced but due to the high compression ratio employed by the air in the engine cylinder, the combustion will takes place due to the presence of heat in the air and the fuel injection from the top of the engine head.

fuel Injector in ci engine

The Fuel injector is the advance of the Carburettor because at whatever the speed it might be, the carburettor will be sending the same amount of fuel into the combustion chamber whereas the Fuel Injector decides the suitable amount of fuel supply depending upon the speed of the vehicle.

Now, let's talk about Spark Plug...

What is a Spark Plug?

A spark plug is a component which is located in the cylinder head is used to ignite the fuel at the end of the compression stroke and at the beginning of the expansion stroke in the engine cylinder.

Dissected modern spark plug showing the one-piece sintered alumina insulator. The lower portion is unglazed by Industry Shill.

The main aim is to produce the spark in the combustion chamber for the ignition of charge (fuel and air mixture) present in the cylinder. The proper location of the spark plug in the cylinder head and the distance between the reciprocating piston provide correct timing for Ignition.

You can see the Spark plug in the case of Internal Combustion Engines.

Now, let's understand the major difference Between the Fuel Injector and Spark Plug.

Difference Between the Fuel Injector and Spark Plug

The Difference Between the Fuel Injector and Spark Plug was presented below in the tabular column.

Fuel InjectorSpark Plug
The Fuel Injector is used in C.I.Engines.The Spark Plug was used in S.I Engines.
Only Air is used in the cylinder and the fuel is injected from the top of the cylinder head.Air-Fuel mixture is used in the S.I. Engines.
There is no need for a spark plug in the case of C.I. Engines. Only Compressed air and fuel injection are responsible for the ignition.The Spark plug is used to ignite the air-fuel mixture entering into the combustion chamber for the conversion of reciprocating motion into rotary motion of the piston.
The fuel injector is costlier than the spark plug. The spark plug is cheaper than the fuel injector.
The maintenance is very less compared to the spark plug.Inspection is done for the formation of corrosion on the spark plug else it encounters starting problem in vehicles.
Difference Between the Fuel Injector and Spark Plug

So these are the Differences Between the Fuel Injector and the Spark Plug. If you have any doubts, you can contact us and we will reply to you within 24 hrs.

More Resources:

Differences between SI and CI Engine [With PDF]
Difference between Shaper and Planer Machine [PDF]
Difference Between a Refrigerator, Heat Pump, and Heat Engine [PDF]

References [External Links]:

Print Friendly, PDF & Email

About Mohammed SHAFI

Mohammed Shafi is the founder, managing editor, and primary author of Mechanical E-Notes. He is an Assistant Professor (Department of Mechanical Engineering) at the Sreenidhi Institute of Science and Technology. He has a 6 years of vast experience in design, research, and data analysis. Shafi has co-authored two journals 1. Dynamic and Fatigue Analysis on Tillage Equipment  2. Welding Procedure and Testing Analysis on Mixing and Nodulizing Drum.

Continue Reading

Supercharger: Definition, Types, Parts, Working Principle, Advantages and Disadvantages, Applications

Supercharger is an air compressor used for forced induction of air into an internal combustion engine whereas Turbocharger works on the exhaust gases from the cylinder for better efficiency. In this article, I will be explaining about Supercharger: Definition, Parts, Working Principle, types, Advantages and Disadvantages, Applications in a detailed way. Before discussing in detail, let's […]

10+ Properties of Molding Sand [With PDF]

The Properties of molding sand are adhesiveness, cohesiveness, flowability, collapsibility, refractoriness, permeability, reusability, Grain size, grain shape, dry strength, Porosity etc.. Before looking at the properties of molding sand or Characteristics , we look into the definition of sand casting. Definition of Sand Casting: It is a process in which the liquid molten metal is […]

Manual Transmission Parts and Function [PDF]

In the last session, we had discussed Epicyclic Gearbox, Overdrive in Automobile and Torque tube drive. Whereas in todays session, we will discuss Manual Transmission Parts and Function in a detailed way. Manual Transmission Parts and Function: Before discussing the Manual Transmission and function , Let's discuss What is Manual Transmission and How does it […]

[Notes] Wheels and Tyres: Definition, Types, Advantages, Disadvantages, and Applications [With PDF]

The wheels and tyres have to take the cushioning effect and the vehicle load so that they can cope up with the steering control. In today's article, I will discuss in detail about wheels and tyres along with its advantages, disadvantages and applications. What is a Wheel? A wheel is a circular object having a […]

Difference between Boiler Mountings and Accessories [PDF]

Boiler Mountings and Accessories play a key role while running any boiler i.e. whether it is a water tube boiler or a Fire-tube boiler. Hello Readers. In the last class, we had discussed detailed information on Boilers along with high-pressure boilers. Therefore, in today's class, we will discuss the difference between boiler mountings and accessories […]

What are the Components of an IC Engine?

Hello readers, In today’s article, I will discuss some important components of an IC engine with their functions.  Internal Combustion Engine aka IC Engine is a heat engine which works on either the Otto cycle or diesel cycle. In this type of engine, the combustion of the fuel occurred inside the engine. And produced thrust […]

Lamont Boiler: Definition, Parts, Working, Advantages, Disadvantages & Applications [PDF]

Lamont Boiler is a Water Tube boiler and it is also a high-pressure boiler. Before knowing about any type of boiler, we need to know what actually is a Boiler? In the last article, we had discussed in detail the types of boilers like Babcock and Wilcox boiler Cochran Boiler Benson Boiler Hello Readers, in […]

Benson Boiler: Definition, Parts, Working, Advantages, Disadvantages & Applications [Notes with PDF]

In the last session, we discussed Lamont Boiler, In today's session, we will discuss Benson Boiler along with its Definition, Parts, Working, Advantages, Disadvantages & Applications. So let's dive into the article! Benson Boiler Definition: Benson Boiler is a high pressure, drumless, supercritical water tube boiler that makes use of forced circulation but has a unique […]

Types of Axles: Front Axle, Rear Axle and Stub Axle [PDF]

An Axle is a shaft for rotating wheels of the vehicle. One end of the axle is connected to the differential via Sun gear and the other end is connected to the wheels. In the last article, we had discussed Synchromesh Gearbox and Epicyclic Gearbox which comes under manual and Automatic Transmissions. In today's class, […]

Torque Tube Drive: Parts, Working Principle, Advantages, Disadvantages and Applications [PDF]

In the Torque Tube Drive, the spring takes the weight of the body, side thrust, and the remaining i.e.Torque reaction, driving thrust and the braking torque was taken by another member which is called the Torque Tube. In the last class, we had discussed Hotchkiss Drive in a detailed way whereas, in today's class, we […]