Comparison between CRDI and TDI engine

These are the fuel injection system in a diesel vehicle. A fuel injection system plays a vital role in the design of a car. The car owner should know about the technology used for the injection system and his / her car. The terms like CRDI and TDI are very common in automobile engineering.

CRDI stands for "common rail direct injection", and
TDI stands for "turbocharged direct injection".

Most of the car brands in India uses CRDI as fuel injection system in their cars. Brands like Mahindra, chevrolet, tata etc. uses CRDI Technology in their car design. The world wide famous brand Volkswagen uses TDI fuel injection Technology in their vehicles.

Also Read:

What is CRDI- Common Rail Direct Injection System

What is CR4 Engine Technology

Diffrence  Between CRDI And TDI Technologies

CRDI ( Common Rail Direct Injection )

CRDI or common rail direct injection system is a method of injection of fuel into the engine cylinders of petrol and diesel engines.In the engines, a high pressure common rails used to inject the fuel in individual valves.In the modern generation engines this fuel injection system is used mostly because of technological advancement.In this method a common and single line is used to inject the fuel. This common line is connected to all the fuel injectors in the system, this common line is known as common rail.

CRDI Diagram

Robert Huber is the name behind initial development of CRDI. He developed its prototype in 60’s decade. Few more names come after him for the further development of this technology.After Robert Huber, Dr. Marco Ganser worked on it. In the 90’s decade this technology is used in the production vehicle in japan.The first public passenger vehicle with this technology is used in 1997 in model Alfa Romeo 156 2.4 JTD.This technology was used in the marines and engine locomotives for a period of time.

In the system the advance solenoid fuel injectors will be used instead of using conventional injectors.In this system a common fuel distribution pipe is used to distribute the fuel evenly for all cylinders. That is why the system is called common rail system. This helps to maintain the pressure and the fuel can be stored here. So the supply and storage is maintained constant to the solenoid injectors by the common rail.In the modern engine with CRDI the injectors are used with turbocharger to increase the efficiency. It helps to reduce emissions and improves power output.

TDI ( Turbocharged Direct Injection )

Tdi has the facility of turbo charging and direct fuel injection into the engine cylinder. The fuel injector injects the fuel into the engine and spray it in the combustion chamber. The direct injection atomises the fuel and transfer it to the combustion chamber. Turbocharger present and system increase the amount of air during combustion or when intake of fuel takes place. It helps in better combustion.

An intercooler is provided in the TDI that help in lowering the temperature. Due to this the amount of fuel injected can be increased for combustion.TDI has less open surface which helps cut down the heat losses and ultimately increase the engine efficiency.

This useful Technology was developed by volkswagen group. Most of the vehicles of volkswagen group uses this technology in their vehicles. Volkswagen uses this technology in the commercial vehicle and marine engines. With the use of this technology vibes great power and more efficiency.


1. CRDI  has a high pressure pump inject the fuel so it do not require a turbocharger, but TDI uses turbocharger from exhaust to increase the engine power and efficiency.

2.If we compare the efficiency orbit Technologies, CRDI seems to win. The reason is that CRDI uses sensor and has injector pipe to provide the fuel as per the necessity. So in this criteria CRDI is better than TDI.

3.The cost of TDI engine is less than crdi. but CRDI is more efficient so it will save more fuel and money. in other words, operational cost of CRDI is economical. 

4. CRDI Technology can be used for any vehicles of any brand, but TDI is specially developed exclusively for Volkswagen group.

5.The design of TDI Technology is simpler than the CRDI.

6.Maintenance of TDI is cheaper than the CRDI.

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