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MPFI Engine vs Carburettor Engine

  • Author :
  • TATA AIG Team
  • Published on :
  • 06/12/2023

How can the automobile industry be behind in this technologically advanced era where everyday innovation occurs? Automobile producers worldwide are working on technology that can increase efficiency and reduce emissions. One such innovation which is getting a lot of traction is the evolution of the combustion engine.

MPFI engines are combustion engine types. MPFI engine’s full form is a multi-point fuel injection engine that provides better overall performance to vehicles. Another combustion engine is the carburettor engine, which uses a device or component named carburettor.

The carburettor engine is a conventional technology used in old vehicles, while MPFI is the advanced type of internal combustion engine.

Here in this blog, we will learn the MPFI and carburettor meanings, how they work and the carburettor engine vs the MPFI engine.

MPFI Engine: Meaning, Working, Pros and Cons

MPFI or Multi-Point Fuel Injection engine is an internal combustion type that uses modern fuel injection technology to deliver the right amount of fuel directly into the engine's cylinder through multiple ports.

This type of fuel injection is a very advanced version of the carburettor engine. Compared to other engines, the MPFI engines atomise the fuel and inject directly, leading to better performance.

How does the MPFI Engine Work?

To understand the workings of an MPFI engine, you need to know that this type of combustion engine has port injection located in front of the inlet valve of the engine. The purpose of this injector is to inject the correct or optimum quantity of fuel into the engine, which makes fuel atomise or swirl the chamber, which reduces the fuel condensation.

There are various components of MPFI, such as:

Fuel Pressure Regulator - The work of the fuel pressure regulator is to control the pressure of fuel and smooth injections.

Engine Control Unit - ECU or engine control unit is the essential component of the MPFI engine which controls and manages the various parameters of the fuel injection process.

Sensors - There are various sensors involved in the MPFI engine system, such as oxygen, position, temperature, and more.

Pros of MPFI Engine

There are various advantages offered by the MPFI engine, which are as follows:

Due to the optimal fuel delivery, the MPFI engine offers the right combustion, leading to increased engine torque and power.

Further, optimal fuel delivery and optimal combustion leads to a cleaner environment since harmful exhaust emission is negligible.

These engines have better cold start capabilities because they have temperature sensors that deliver fuel based on engine conditions.

Besides this, this kind of engine has better durability and reliability. Because of this, the MPFI engine has a better lifespan and requires minimal maintenance.

Cons of MPFI Engine

Irrespective of its advantages, there are some cons of this engine, such as:

Due to the higher components used in this internal combustion engine, its cost is very high.

Another disadvantage of the MPFI engine is its complex design compared to traditional carbureted engines.

Carburettor: : Meaning, Working, Pros and Cons

A Carburettor is basically a device used in an internal combustion engine that combines the fuel and air before it enters the engine combustion cylinder. It is a very old and effective fuel induction method in a vehicle. Karl Benz developed the very first carburettor.

How Does the Carburettor Engine Work?

The working of the carburettor engine uses the venturi effect principle. The main component of a carburettor engine is a carburettor, which is in the shape of a pipe attached to the combustion cylinder. This pipe allows air to pass through the narrow portion known as venturi. This narrow portion creates a low-pressure area, and the velocity increases.

Further, the low pressure draws fuel from the float chamber, which gets mixed with incoming air, leading to the combustion process.

There are various components of carburettor, such as:

Venturi- It is a pipe-like structure that allows fuel and air to pass through it. Different kinds of venturi are available, such as vane venturi, variable carburettor venturi and more, depending on the velocity and pressure needed.

Throttle valve- The working of this valve is to regulate the quantity of air-fuel mixture entering the combustion cylinder.

Choke- The purpose of the choke is to regulate the proportion of fuel in the combustion mixture.

Float chamber- It is the storage chamber that stores fuel and provides it when needed. It also has a float valve to control the fuel amount.

Mixing Chamber- This is the chamber where the mixture of fuel and air gets mixed and turns into a combustion mixture.

Metering System- It is another carburettor engine component that controls the fuel flow in the nozzle.

Idling System- It is the system that connects the float chamber with the venturi.

Strainer- The work of a strainer is to refine the fuel that enters the float chamber.

Throttle Return Check- Its function is to check the throttle speed, and high speed can lead to engine stalling or misfiring.

Anti-Dieseling Solenoid- The purpose of the anti-dieseling solenoid is to prevent pre-ignition, which affects the engine performance.

Automatic Mixture Control- The last carburettor engine component is automatic mixture control, which has a plunger-kind shape that controls the mixture.

Pros of Carburettor Engine

Some of the benefits of a carburettor engine are:

The design of the carburettor engine is straightforward, and that's why it is very easy to maintain and has a low price.

Another advantage of a carburettor engine is that it can survive in extreme conditions, such as rough terrain and extreme temperatures.

Further, carburettor engines can work with lower-quality fuel, which is why these vehicles are employed in various regions.

Lastly, the carburettor engine doesn't require much electricity to work or function. However, it requires electricity to start.

Cons of Carburettor Engine

Some of the popular disadvantages of carburettor engines are:

These engines are considered less fuel-efficient than other technologically advanced engines.

The performance of these engines is poor because of lower torque and power output.

These engines' harmful gas emission is high, leading to air pollution.

The air-fuel mixture is not optimised in the carburettor engine.

Difference Between Carburettor Engine and MPFI Engine

Both the engine, Carburettor and MPFI have different workings. Let's cast light on the carburettor engine vs the MPFI engine.

Comparison Table: MPFI Engine vs Carburettor Engine
Parameters Carburettor Engine  MPFI Engine
Fuel Efficiency  Low High
Emission Control  Poor Effective
Maintenance  Low Medium
Cold Starts Challenging Smooth
Cost  Low High

Fuel Efficiency- The first parameter difference between a carburettor engine and an MPFI engine is fuel efficiency. MPFI engine has better fuel efficiency compared to carburettor engine because it provides the precise or right quantity of air-fuel mixture to the combustion cylinder. This leads to the optimal combustion of the fuel and less wastage. This improves the vehicle's overall mileage. While in the carburettor engine, the quantity of fuel-air mixture is imprecise, leading to wastage of fuel.

Emission Control- As mentioned earlier, the MPFI engine has high fuel efficiency, leading to lower fuel waste. This means the MPFI engine has a lower emission rate of harmful gases. Because of this, these engines are environment friendly, while the carburettor engine generates high emissions of toxic gases such as hydrocarbons, nitrogen oxides and more.

Maintenance- Another parameter for comparison between MPFI and carburettor engines is maintenance. The MPFI engine uses advanced components such as sensors and an electronic control system that monitors the engine performance and further detects and resolves the issue in advance. On the other hand, the carburettor engine requires timely maintenance, but due to its simpler design, the work can be done by any mechanic easily.

Cold Starts- MPFI engines are equipped with modern technology, so their cold starts are very smooth compared to the carburettor engine. The MPFI engine has an ECU or engine control unit that adjusts the mixture of fuel and air based on the temperature. Due to this, the ignition process is very smooth, even in low temperatures. However, the carburettor engine requires warm-up during the cold weather.

Cost- One significant difference between carburettor engines and MPFI engines is cost. The carburettor engine has a simple design and procedure, making it readily available at a lower price. However, the MPFI engine has complex components, and these components have relatively high prices, making it an expensive internal combustion engine.

Importance of Car Insurance Policy For MPFI or Carburettor Engine Vehicle

Deciding between a carburettor and an MPFI engine can be difficult, but as long as you drive a four-wheeler in India, you must have a basic third-party car insurance policy. The insurance provides vehicle protection against third-party liability. However, since vehicles today are very advanced, vehicle owners prefer a comprehensive car insurance policy that protects against various man-made and natural risks.

Not just this, the car insurance policy from Tata AIG has various add-ons such as engine cover, daily allowance, and roadside assistance to enhance vehicle protection.

We offer a network of 7500+ garages nationwide with our car insurance policies that offers cashless repair services to policyholders. We offer a list of 17 add-ons, such as key replacement, tyre secure and more, for policyholders from which they can choose based on their requirements. Additionally, we offer a quick and easy car insurance claim process.

Anyone can buy our budget-friendly car insurance plan in just three easy steps from the website.


Fuel injection is modern-day internal combustion engine technology and is widely preferred because of its benefits. That's the reason why newer vehicles have MPSI engines. The MPFI engine is widely used in petrol variant vehicles.

Some vehicles still use a carburettor engine, but these engines are phasing out. So, finding its components can be problematic in the market in case of repair.


Are carburettor engines still in use?

Many old vehicles used to have Carburettor engines, but this engine has not been in use since the introduction of Fuel injection technology.

Which engine uses a carburettor?

A carburettor engine is generally in use with petrol variant vehicles

Can a carburettor be better than a fuel injection?

Carburettor engines rely on conventional technology, but new fuel injection has advantages such as better fuel emission, less environmental impact and more.

What type of fuel does an MPFI engine require?

MPFI engines can use a variety of fuels such as ethanol, petrol and more to function properly. Regular and timely maintenance of such vehicles, such as cleaning fuel injectors, filters, valves and more, is necessary for better overall performance.

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