What Is A CRDI Engine?

Most of the people who used to be called “gearheads” will at least be familiar with the term CRDI and how it applies to engines for cars and trucks. The letters stand for common rail direct injection, which is a fairly recent design for diesel engines that may also be suitable for passenger automobiles. Though originally intended for commercial use, this design is now in wide use around the globe.

The method is chosen by more and more manufacturers and by individual users because it is fuel efficient as other diesel technologies were. However, CRDI has also provided a tremendous boost in diesel-engine performance. The improvement is mainly due to the common-rail design, which has tubes that connect all the injectors. These injectors are based on the direct-injection concept, as was the case in the past. But the common-rail design was quite a step forward.

CRDI EngineFuel in the common tube or “rail” is under a set amount of pressure which causes the fuel to be “atomized” or broken down to its smallest particles. This allows the fuel to combine with the air much more efficiently. With proper direct injection, fuel use is highly efficient, with much less waste fuel escaping the system unused.

The newest electronic technology has also allowed CRDI engines to better control the amount of fuel used, the pressure within the system and the timing of both the injection of fuel and the electronic charge applied to make the fuel burn. Injectors in the common rail direct injection engine have controls on the injector heads that allow slight variances in the amount of fuel put into the cylinders.

As is the case with almost all automobiles, trucks and motorized equipment today, a “computer” or electronic “brain” controls the various factors, including amount of fuel, timing of injection, timing of the charge and the pressure within the tubes or common rails. According to those who have used this technology in both test and commercial applications, the CRDI method greatly reduces engine and vehicle vibration, allows the engine and vehicle to run more quietly and reduces the cost of operation significantly.

For the most part, traditional, classic carburetion engines have been replaced by such methods as MPFI or multi-point fuel injection designs for gasoline engines and CRDI or common rail direct injection for diesel engines. MPFI was first developed some years ago in response to the call for more fuel-efficient engines. The need for better emission standards made MPFI popular, since it allowed for better gas mileage in automobiles.

CRDI for diesel vehicles has improved performance by as much as 25 percent, according to some studies. This gives the vehicle more power and makes the technology more attractive for passenger vehicles. These engines run much more smoothly, with efficiency greatly enhanced by higher pressure possible in the common-rail or tube design. While the CRDI engine is a little more expensive than previous technologies, the savings in fuel cost can help recoup the initial expensive over time.

Category: Cars & Vehicles

39 Comments on “What Is A CRDI Engine?”


George K Verghese,Kaippanickal wrote:

Fine information to all who have eager to know about CRDi & Multipoint Injection.

neeraj naik wrote:

what a innovation?
i am an automobile student.
i like to know about the operation of crdi&mpfi engine
how can crdi engines run smoothly?

rohit samant. wrote:

explain with example the actual operation in crdi engine.
i am an automobile student.

PAVAN GAWANDE wrote:

WHAT IS THE ACTUAL FANCTION EACH SENSOR & ACTUATOR IN CRDI ENGINE
I AM AN AUTOMOBILE STUDENT

pankaj sindhu wrote:

1. crdi stands for……………………………..
2. how improve efficiency of an engine
3 why hybrid system is used in crdi engines

ghotra wrote:

gud info about crdi

Sukhwinder Dhindsa wrote:

I want the training of crdi system. Where from I can get this training near the Punjab state beacause I belongs to Punjab?

mrinal neogi wrote:

I want to know about new tecnology of crde engine

muzir wrote:

I want to Know CRDI Engine Maintannce

sonu wrote:

further details,working

sujin wrote:

explain with example the actual operation in crdi engine

sandeep wrote:

crdi is looking easy to mount and fit because of rail type shape rather to use housing wires for the use of injection.

Revanth reddty wrote:

what a innovation?
i am a mechanical student.
i like to know about the operation of crdi&mpfi engine
how can crdi engines run smoothly?

Mayur Gupta wrote:

fine information about the crdi-engine!
sir, can you explain it with some good and detail diagrams please?

mayur wrote:

good information

ajeet wrote:

crdi might be used for reducing the fuel exhaution per ltr to great extent

Fahad wrote:

I am automobile engineering student. How is fuel injected in it? What is its working principle?

vv vv wrote:

the diffrent typ of fuel injuction

Ambar Nimbalkar wrote:

Needs example for more clerification.

Roshan wrote:

i am mechanical engg student ,i would like know ,whether a normal diesel engine can be modified to crdi…ones….? any related sites would also help…. explain fesiblity….of doing so…. explain sensors required…

B.S.GILL wrote:

i am an injector pump mechanic in shillong i also repair CRDI systems. please be kind enough to tell me more about the sensor functions.
your reply is keenly awaited.

mona wrote:

hello sir,
please give me more information about CRDI & MPFL engine…..
how it works???
what is the mechanism in it??

rohan dev wrote:

hi..am an electical engineer doin my MBA… how innovative was the crdi technology in the industry? who developed the idea behind it and when was it introduced commercially? pls give insight… THANKS

M Somasekhar wrote:

please give me more information about CRDI & MPFL engine…..
how it works?
what is the mechanism in it?

Santhosh wrote:

Hi sir thanking for your details verymuch about CRDI

VISHAL wrote:

great information.

but i want to know which engine is superior among CRDI ENGINE AND TDI ENGINE.

Julius G wrote:

Yessss!!!
i love this engine with CRDI design yow!
i have Hyundai accent, diesel fuel
the CRDI gives me ahhh so much fuel efficient
it can run 30km per litter of diesel wow really amazing….
and not only that
it has a lot of torque

premjil m wrote:

i am an automobile sudent
difference bw crdi&mpfl
simple idea abt crdi

Nick Exton wrote:

BIG MISTAKE!

Yea sure, with Electronic Injection you can get much more power compared to a Mechanical Injection Equivalent. But the whole point about diesels is that they are reliable work horses and can go where petrols dare to venture! But alas no. In my opinion, Electronic Injection is a big mistake as far as reliability and durability are concerned.

Look at the Vehicles’ that the army use to depend upon in battle, do you see them using Electronic injection? Thought Not!

Danish wrote:

father of engines..!

shashank sharma wrote:

I am comfortable about your site,but one thing is to say that why cant you show the manufactures who are using and developing vexing engines in world wide ..

arif shaikh wrote:

The Diesel engine was invented by Rudolf Christian Karl Diesel, a German inventor born in France. He designed a single 3 m iron cylinder with a flywheel at its base which ran on its own power for the first time in Augsburg, Germany on 10 August 1893.

above answer is for rohan………

Ray G wrote:

Nick, times are a changing, most heavy truck makers now offer CRD engines in their line up, the military also now use CRD engines in light weight vehicles and personnel carriers, I agree diesel engines have always had a reputation for reliability due to the lack of complicated electrics but alas the the world can’t take all that smoke and soot any more. I own one of the Hyundai U2 engines in the compact I30 model. It’s without doubt the most fun you can have driving, without being chemically enhanced. The torque and fuel mileage from the 1.6 ltr engine are unbelievable, makes my old 2.5 Ltr Subaru engine seem like a gas guzzling tractor in comparison. Plus you have to love that gentle turbo whistle at idle, yeehah.

AKHIL. R. S wrote:

A New Method
I am a mechanic technician. How to work a Petrol Engine like as a Diesel Engine . Remove the spark plug and distributer and install a FIP same like Diesel Engine and its attomizers. The opening pressure is 200 to 230 kg/cm2. The opening timing is set to (four cylinder) 1|4 (the Ist piston at TDC). This engine give more fuel efficiency.

bosch wrote:

Electronic Injection you can get much more power compared to a Mechanical Injection Equivalent. But the whole point about diesels is that they are reliable work horses and can go where petrols dare to venture! But alas no. In my opinion, Electronic Injection is a big mistake as far as reliability and durability are concerned.

Look at the Vehicles’ that the army use to depend upon in battle, do you see them using Electronic injection? Thought Not!

Bhavesh Khatra wrote:

Difference between CRDI and MPFI

CRDI- Common rail direct injection, generally used in diesel engine.
MPFI- Multi point fuel injection, generally used in gasoline engine.

giriraj wrote:

What is the function of the injector?

Praveen wrote:

I am a mechatronics student.
I want to know how can electronics be implemented in CRDI or MPFI engines ?

Bharath wrote:

I am a automobile student. I want to know how can electronics be implemented in CRDI or MPFI engines?

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