What is CRDi in Engines?

Vociferous Writers
2 min readJun 21, 2021

We generally see some engine badge on the back of the car. These are generally written to identify the type and model of the car. A very common badge that we have seen on the backside of the cars is CRDi. These type of badges is seen in diesel engines. This is the name of the system i.e Common Rail Direct Injection (CRDi). This system is used for the even distribution of fuel from the fuel tank to the engine cylinder.

The earlier method of the travel of the fuel from the fuel tank was through camshaft. This means that the power of the engine depends upon the speed of the engine. Thus power obtained at low speeds was very low. To overcome this problem, engineers developed a proper system i.e. CRDi. In the earlier method, fuel did not get atomized inside the combustion chamber and thus resulting in poor performance of the engine. Whereas in the newly developed CRDi system, proper atomizing of fuel occurs even at low speeds.

How does it work?

Let us understand how CRDi actually works. First of all, we need fuel in the gas tank. Then ensuring enough fuel in the tank, when we start the engine, the fuel pump gets activated and it transfers fuel from the tank to a common line known as the rail, which transfers fuel at higher pressure to the injectors. Due to high pressure, fuel gets atomized and proper mixing of fuel with air occurs, thus resulting in more power even at low speeds. These injectors are connected to ECU (Electronic Controlling Unit) which monitors the pressure at injection and also the timing of injection.

Benefits of CRDi

1. We get more power at less speeds

2. Better fuel efficiency i.e. more mileage

3. Lesser vibrations

4. Less engine noise (Our favorite)

I hope you would have gained some insights regarding the CRDi engine badge and what actually a CRDi is. If you love our content then pls do comment, which will give us the motivation to work harder and bring more interesting short blogs. Also, there is an insider tip [Adding your valuable comments is free here].

Written by: Tanmay Shah (Instagram: @tanmay_012)

Vociferous Writers (Instagram: @vociferouswriters)