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Fuel Injection San Diego Experts Explain the Basics of CRDI

Fuel Injection San Diego Experts Explain the Basics of CRDI

Common rail Direct Injection or CRDI is a system used to inject fuel into the cylinders of a diesel engine directly, via a single line known as the common rail. This line is connected to all the fuel injectors inside the engine.
Traditional fuel-injection systems used in diesel engines relied on building up pressure for every injection cycle. The new systems maintain a constant pressure level at all times so that it is available through the fuel line at all times. The engine regulates the pressure depending on the load and the speed of the engine.

An electronic unit or ECU adjusts the pressure using sophisticated sensors placed throughout the engine. This way, injection and compression are independent and fuel can be injected when needed. This helps reduce dangerous emissions and saves valuable fuel.

The History of CRDI

The prototype was first developed by Swiss engineer Robert Huber in the late 60’s. The technology was further developed by Dr. Marco Ganser. It was first used in Japan in the mid 90’s in car production. While the modern CRDI systems operate on the same principle, the main difference is that injectors are operated electronically rather than manually. 


CRDI is most commonly used in marine diesel engines as well as locomotive ones. However, more and more car models are using this model as well, ranging from mid-range to premium cars. Many manufacturers are beginning to employ CRDI as standard, including Fiat, Honda, Hyundai Motors and many others. Premium manufacturers have also started adopting the system but branded it under a different name.

How Does CRDI Work?

As we previously mentioned, common rail gets its name from the rail that supplies all the fuel injectors inside the diesel engine. The rail is basically a pressure accumulator which stores the fuel. This accumulator then supplies the fuel injectors with pressurized fuel. The injectors are controlled by an electronic regulator called the ECU. When the injectors are activated, a valve opens and the fuel is delivered into the cylinders at the desired pressure. 

Pros and Cons of CRDI Systems

Saying that CRDI revolutionized diesel engines is not by any means an overstatement. In fact, engines equipped with this technology are as much as 25% more powerful than ones utilizing a traditional injection method. More importantly, using this system reduces dangerous emissions, making these engines better for the environment.

However, their biggest disadvantage is that they are more costly than engines with the traditional injection system. They also require more maintenance and spare parts can be difficult to find.
Fortunately, PCE provides premier service for marine diesel engines. If the CRDI system in your engine is giving you trouble or just needs routine maintenance don’t hesitate to get in touch with our fuel injection San Diego experts at (619) 235-0961.

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