Introduction : A multi-point injection system, also called port injection, has an injector in the port (air-fuel passage) going to each cylinder.
Gasoline is sprayed into each intake port and toward each intake valve. Thereby, the term multi-point (more than one location) fuel injection is used.
Multipoint fuel injection (MFI) locates an injector immediately upstream of each inlet valve, which enables better control of the air/fuel mixture to each cylinder.
Ever since the World saw the first single cylinder petrol engine driven Car, a Carburetor became synonymous with it.
Later on with the advent of multi-cylinder Engines, so did the Distributors.
During the last Century, both evolved considerably till the ‘Euro-II’ like Pollution Norms got the better of them.
For, the Carburetors worked on a fundamental principle of ‘reaction’, which could easily get stifled for so many reasons.
Whereas man, as always, wanted to be literally in the Driver’s Seat, all the way along.
Thus, as the cliché of necessity being the mother of invention goes, a System of controlled-feeding of Fuel + Air + Ignition Spark to the ICE Cylinders in the early 80s evolved.
A system like that had to be based on its ‘needs of the moment’, such as the load on it, engine rpm/road speed etc.
Such a ‘system’ had to ensure that the Pollutants were kept to a bare minimum all over its operating range.
Not to mention squeezing the maximum mileage out of the last drop of fuel that went into it. Thus Fuel Injection systems were born replacing nearly a century old Carburetors.
It all started with Single Point Fuel Injection Systems virtually an electronic replica of the Carburetors but soon led to Multipoint Fuel Injection Systems.
The 1990 Subaru Justy was the last car sold in the United States to have a carburetor; the following model year, the Justy had fuel injection.
But fuel injection has been around since the 1950s, and electronic fuel injection was used widely on European cars starting around 1980.
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