MPFi V/S CRDi. V/S. in petrol engine for gaining more uniform Air Fuel blending fuel is injected at various point in the path of air. but in case of DTSI(digital twin. Know everything about Multi Point Fuel Injection (MPFI) system on CarTrade Blog. Fi EFi MPFi GDi. EFi stands for Electronic Fuel injection (EFi) whereas MPFi or MPi stands for Read more: How CRDi technology works?>>.

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It also brings a significant reduction in the noise and vibrations of conventional diesel engines.

EFi vs MPFi vs GDi: How Electronic Fuel Injection Technology Works? – CarBikeTech

CRDI principle not only lowers fuel consumption and emissions possible; it also offers improved comfort and is quieter than modern pre- combustion engines. Conventional direct injection diesel engines must repeatedly generate fuel pressure for each injection.

To improve pulverization, the fuel must be injected at a very high pressure, so high that normal fuel injectors cannot achieve it. More accurately measured and timed mixture spray in the combustion chamber significantly reducing unburned fuel gives CRDI the potential to meet future emission guidelines such as Euro V.

Then, a specially designed oxidizing catalyst converter locating near the entrance of the particle filter unit will combust the remaining unburnt fuel come from the “post- combustion”. Whereas ordinary diesel direct fuel-injection systems have to build up pressures a new for each and every injection cycle, the new common rail line engines maintain constant pressure regardless of the injection sequence.

Expensive to maintain in case of repairs. ,pfi is no glow plug since the injection pressure is high. In short, “post-combustion” cuts pollutants.


That is where the common fuel line rail comes in. This technique allows fuel to be injected as needed, saving fuel and lowering emissions. Fuel rail is an accumulator which stores the high pressure fuel and releases it to the injector nozzle based on inputs from ECU.

Common-rail engines are thus clearly superior to ordinary motors using either direct or indirect fuel-injection systems. Uniform air-fuel mixture and higher fuel efficiency. A few advantages of MPFI over carburetor is.

The powerful microcomputer makes the whole system more perfect and doubles the torque at lower engine speeds. Particle emission is always the biggest problem of diesel engines. CRDI system is more complex when compared with MPFI, but yet is more efficient, offers more power and has good response to no or part engine loads which makes the diesel engine deliver more power even at low engine RPM.

EFi vs MPFi vs GDi: How Electronic Fuel Injection Technology Works?

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Imperfect pulverization leads to more unburned particles, hence more pollutant, lower fuel efficiency and less power. The engine’s electronic timing regulates injection pressure according to engine speed and load. Newer CRDI engines feature maximum pressures of bar. This division of labor necessitates a special chamber to maintain the high injection pressure of up to 1, bar. Conventional non-CRDI Mechanical indirect injection engines are very sluggish and noisy to operate, in which the pump pressure forces the injectors to open to spray the fuel and hence abnormal spray patterns resulting in rich black smoke from the exhaust.

Benefited by the precise timing, common-rail injection system can introduce a “post-combustion”, which injects small amount of fuel during crdii expansion phase thus creating small scale combustion after the normal combustion takes place.


Without being introduced to an antechamber the fuel is supplied directly to a common rail from where it is injected Krunal P. MPFI came into play as a means to meet emission norms set by various countries and in addition it also helps in deriving out good vehicle performance and minimum quantity of fuel.

Drawback of MPFI over carburetor is. When the timing shuts the solenoid valves, fuel injection ends immediately. Sensor data from the camshaft and crankshaft provide the foundation for the electronic control unit to adapt the injection pressure precisely to demand. Common rail refers to the single fuel injection line on the CRDI engines. Jose Perez, Fiat Multiair Technology Announced, technologyannounced-more-power-less-fuel-less emissions.


The process is called regeneration. Engine crank not necessary during cold start. The common rail upstream of the cylinders acts as an accumulator, distributing the fuel to the injectors at a constant pressure of up to bar. In the CRDI system developed jointly by Mercedes-Benz and Bosch, the electronic engine management system continually adjusts the peak fuel pressure according to engine speed and throttle position. In this system it is seen that the CRDI engine developed more power and also increased the fuel efficiency.

As a result, mpri only pulverization is improved by the higher fuel pressure, but the duration of fuel injection can be shortened and the timing can be more precisely controlled.

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