What is Common Rail Direct Injection ( CRDI ) ?

CRDi means Common Rail Direct Injection. This is a new technology for diesel engines - suitable for both passenger cars and commercial vehicles.

CRDi, which has been sourced from the US-based Detroit Diesels, is extremely popular in the US and Europe because of its higher fuel efficiency, improvement in drive quality and its quieter operation. CRDi technology is based on direct injection technology and have "rails" which inject pressurized fuel directly into the engine cylinder. This significantly improves engine efficiency and reduces noise and vibrations.

In CRDi unit, a tube (common rail) connects all the injectors and carries fuel at a constant high pressure of 1,300 bar. The CRDi engine squirts a small amount of fuel into the engine before the actual charge and one afterwards. The high pressure in common rail ensures that when injected, the fuel atomizes to a very high degree that mixes evenly with the air, ensuring maximum combustion. Also, the injectors have variable control heads which allow a "very precise" dose of diesel into each cylinder. CRDi electronically controls the engine pressure, fuel quantity and injection timing to give better fuel efficiency.

Advantages:
* 30-35% more mileage
* 25% more power than normal DI engine
* 70% more torque than normal diesel engine
* less Noisy
* more driving comfort
* more environment friendly

Disadvantage:
* high initial cost, spares and labor.

FIAT has set the record of producing large-scale CRDi engines for the first time. Globally, Bosch is the leader in CRDi with over 75% of the market share, followed by Siemens VDO, Delphi (Lucas) and Denso.

Hope you enjoyed this information.


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