Abstract— The use of CRDi and MPFi is becoming more and more significant in the automotive industry. Gone are the days when vehicles used to be only. CRDI vs TDI. If you have your own motor or car, you are cool; but what is the use of having one if you don’t know anything about engines?. EFi stands for Electronic Fuel injection (EFi) whereas MPFi or MPi stands for Multi -Point Fuel Thus, there is a fundamental difference between the earlier generation carburetor Read more: How CRDi technology works?>>.

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The central on-board computer that helps determine the amount of fuel needed according to the driving conditions.

Sorry, your blog cannot share posts by email. The engine control unit , located within the engine compartment, follows a map, or program that gives the criteria for how much fuel is delivered in various situations.

Directly injected into the cylinder without mixing first; costs more; very clean system since intake is dry. This includes the amount of fuel to be released, the timing of injection, the npfi of the charge, and its pressure within the common rails. This mixture provides the combustive power that drives the vehicle down the road.

Common Types of Fuel Injection Systems A multitude of fuel injection system types exist, though most fall into three distinct categories: Get New Comparisons in your inbox: The computer determines this according to the driving conditions at the time applied to a map, or program within its systems that details how much fuel the fuel system delivers at any particular time and condition. The actual fuel injection process of the multi-point system broke down into three types of injection methods, sequential, batched, berween simultaneous.

Simultaneous means the fuel arrives at each cylinder at the same time.

Common Rail Direct Injection – CRDi Technology Working Explained

Direct injection, on the other hand, delivers the fuel directly to the combustion chamber. Expensive to maintain in case of repairs. You agree that we have no liability for any damages. Drawback of MPFI over carburetor is. Sensors Sensors located within the vehicle fuelling system help the engine control unit determine when certain functions need to happen.


Sequential is timed to coincide with the intake stroke of each cylinder.

Differences Between CRDI and TDI | Difference Between | CRDI vs TDI

Batched, which means the fuel injection system delivers the fuel to the cylinders in groups. These combustive explosions, on the order of hundreds of times per minute, impart this explosive energy to the crankshaft, which in turn drives the wheels of the vehicle, setting it in motion after applying the gas pedal.

It has a common rail design with the tubes connected to all injectors. A DFI system, on the other hand, can produce fuel pressures from around to as high as 26, PSI, which is a big difference and, if care is not taken while servicing a DFI engine, a dangerous amount of pressure. Uniform air-fuel mixture and higher fuel efficiency. Your email address will not be published.


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When purchasing vehicles with different fuel injection system types, shoppers need to keep in mind the key differences. Though CRDI is just a bit more expensive than other diesel engine technologies, you can save a lot in the fuel costs since less fuel is wasted. The sections below detail the various components found in a modern EFI system, including injector, fuel begween, engine control unit, and sensors. Conclusion When shopping for a fuel injection system and fuel injection system parts, shoppers need to keep in mind the type of fuel injection system their vehicle already has installed.

This in turn lowers the emission levels put out by the vehicle.

Differences Between CRDI and TDI

Due to the high fuel pressures involved, DFI systems deliver their fuel quickly, as a common fuel rail feeds each cylinder at the same time. What started out as a single-point injection system grew to utilize a multi-point injection system and then evolved to the current preferred injection method, direct injection.


The fuel injector sprays the fuel betdeen its delivery point in accordance with these computer instructions. This site uses Akismet to reduce spam.

For help on searching the eBay marketplace using keywords, read over eBay’s Search Tips page on how to shop for fuel injection systems. Notify me of follow-up comments by email.

Compression Ratio When it comes to compression, the higher the compression produced, the more horsepower an engine can put forward as power to run the vehicle. Fuel Injection System Types Description Throttle Body Single-point injection system; costs less; simplest fuel injection system available Multi Point Fuel Injection Injects fuel into each cylinder’s intake valve; can be in sequence, simultaneously, or in groups Direct Fuel Injection Directly injected into the cylinder without mixing first; costs more; very clean system since intake is dry While there are more than just the above three fuel injection systems available, the three detailed systems are used with motor vehicles, whereas the others find more common use in aircraft engines and those of high-end sports cars.

How does TDI work? User assumes all risk of use, damage, or injury. TDI uses direct injection. As mentioned earlier, an MPFI system can operate either using a sequential, batched, or simultaneous injection delivery system.

A DFI system delivers the fuel to within the combustion chamber, combining the fuel and air as the air is drawn into the chamber on the intake stroke.

And if you have any questions after reading through the product listing, contact the mpfu directly by clicking on the Ask a Cgdi link on the specific listing page. It is the head which controls several factors. Delivery of the fuel to the combustion chamber represents the main difference between the two fuel system types. To keep your motor or car at its best performance, you must know something about it so that you may take the appropriate actions or measures when things go wrong.