what is the diffrence between mpfi and simple fuel injection system? details and advantages of mpfi system.?

Question

i would like to know the diffrence between ordinary fuel injection system and mpfi system.
does mpfi makes diffrence in pick up and mileage and overall performance of the car.

Answer 1

Multi-port fuel injection has a fuel injector dedicated for each cylinder, it is more costly to manufacture, yet more efficient, and fuel delivery is quicker (instant response on gas pedal).

Simple fuel injection works much like a carburetor on top of the engine, a small sprayer injects atomized fuel into the throttle body, it's varied by the cars computer, is not as efficient, and does not have the high performance of multi-port fuel injection, but it works.

Carburetors are no longer used due to tighter emission standards (clean air act 1992), a carburated engine can run lean on some cylinders, and rich on other cylinders (remember when cars had that exhausty gassy smell coming out of them ? well no more ! with fuel injection (especially "Multi-port") a cleaner more efficient "BURN" of the fuel is completed. Most cars now use "Multi-port fuel injection".

Merry Christmas, hope this helped.

Answer 2

Simple Fuel Injection

Answer 3

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Multi-point fuel injection Multi-point fuel injection injects fuel into the intake port just upstream of the cylinder's intake valve, rather than at a central point within an intake manifold, referred to as SPFI, or single point fuel injection. MPFI (or just MPI) systems can be sequential, in which injection is timed to coincide with each cylinder's intake stroke, batched, in which fuel is injected to the cylinders in groups, without precise synchronisation to any particular cylinder's intake stroke, or Simultaneous, in which fuel is injected at the same time to all the cylinders. All modern EFI systems utilize sequential MPFI. Some Toyotas and other Japanese cars from the 1970s to the early 1990s used an application of Bosch's multipoint L-Jetronic system manufactured under license by DENSO.

Answer 4

The simple fuel injection you refer to is a small progression on old carburettor technology that made carburettors cheaper to manufacture. In this case each cylinder still aspirated a fuel-air mixture.

In the case of the MPFI engines (around for over 12 years in India now), each cylinder sucks in filtered air (no fuel), and an injector sprays atomized fuel into the cylinder during the compression cycle, forming a combustible mixture INSIDE the cylinder. Towards the end of the compression stroke, the spark plug ignites the mixture.

Sophisticated engines come with multiple valves, and more than one injection point and sometimes more than one spark ignition point as well within a single cylinder.

Answer 5

Generally speaking most cars are mpfi now. The early fuel injection cars where single point, meaning they only had a single injector operating into a plenum, normally a modified single carb.

Multi point just has one injector for each cylinder, so it can inject fuel closer to the chamber for better dispersion, as well as seperate the four injections for better fuel economy.

There are more parts but it's the more efficient system.

Answer 6

You have got some great answers so far, I have looked at them. The bottom line is that Throttle body, the one that has the injectors mounted on the intake and look like a carburetor are the simplest. There is also some controversy with regard to which works better. On high performance engines, I would prefer multiport, an injector nozzle for each cylinder, for the daily driver, don't need a race motor, I will prefer the throttle body, or as you put it the simple injector, easier to maintain and cheaper to replace.

Answer 7

Multi Point Fuel Injection System in Petrol cars are superior than single point injection system in older vehicles. The main advantage of this system is economy in fuel consumption.

Answer 8

I am not completely sure but I think mpfi is where each cylinder has its own fuel injection and normal fuel injection has what looks like a carb with one or two jets in it. So with mpfi you don't have a normal intake manifold and each cylinder is regulated individually.

Answer 9

This is taken directly from Wikipedia about the types of FI .. hope it helps, click the link for more info! Good luck :)

Throttle-body injection (called TBI by General Motors and CFI by Ford) was introduced in the mid 1980s as a transition technology toward individual port injection. The TBI system injects fuel at the throttle body (the same location where a carburetor introduced fuel). The induction mixture passes through the intake runners like a carburetor system. The justification for the TBI/CFI phase was low cost. Many of the carburetor's supporting components could be reused such as the air cleaner, intake manifold and fuel line routing. This postponed the redesign and tooling costs of these components. Most of these components were later redesigned for the next phase of fuel injection's evolution, which is individual port injection, commonly known as EFI. TBI was used briefly on passenger cars during the mid '80s, and by GM on heavy duty trucks all the way through OBD-I (ending in 1995).

Continuous injection

Bosch's K-Jetronic (K stands for kontinuierlich, or continuous) was introduced in 1974. In this system, fuel sprays constantly from the injectors, rather than being pulsed in time with the engine's intake strokes. Gasoline is pumped from the fuel tank to a large control valve called a fuel distributor, which separates the single fuel supply pipe from the tank into smaller pipes, one for each injector. The fuel distributor is mounted atop a control vane through which all intake air must pass, and the system works by varying fuel volume supplied to the injectors based on the angle of the air vane, which in turn is determined by the volume flowrate of air past the vane. The injectors are simple spring-loaded check valves with nozzles; once fuel system pressure becomes high enough to overcome the counterspring, the injectors begin spraying. K-Jetronic was used for many years between 1974 and the mid 1990s by Lamborghini, Ferrari, Mercedes-Benz, Volkswagen, Ford, Porsche, Audi, Saab, and Volvo. There was also a variant of the system called KE-Jetronic with electronic trim, able to use a catalytic converter.

Central port injection (CPI)

General Motors developed an "in-between" technique called "central port injection" (CPI) or "central port fuel injection" (CPFI). It uses tubes from a central injector to spray fuel at each intake port rather than the central throttle-body. However, fuel is continuously injected to all ports simultaneously, which is less than optimal.

Multi-point fuel injection

Multi-point fuel injection injects fuel into the intake port just upstream of the cylinder's intake valve, rather than at a central point within an intake manifold. MPFI systems can be sequential, in which injection is timed to coincide with each cylinder's intake stroke, batched, in which fuel is injected to the cylinders in groups, without precise synchronisation to any particular cylinder's intake stroke, or Simultaneous, in which fuel is injected at the same time to all the cylinders.

Some Toyotas and other Japanese cars from the 1970's to the early 1990's used an application of Bosch's multipoint L-Jetronic system manufactured under license by ROMIL.

Direct injection

Many diesel engines feature direct injection (DI). The injection nozzle is placed inside the combustion chamber and the piston incorporates a depression (often toroidal) where initial combustion takes place. Direct injection diesel engines are generally more efficient and cleaner than indirect injection engines. See also High-pressure Direct Injection (HDi) .

Some recent petrol engines utilize direct injection as well. Volkswagen and Audi (FSI), Mitsubishi(GDI), Mazda(DISI), Ford(DISI),BMW, Saab, Saturn and GM. This is the next step in evolution from multi port fuel injection and offers another magnitude of emission control by eliminating the "wet" portion of the induction system. See also: Gasoline Direct Injection.