Multi Point Fuel Injection System

4268 Words Mar 19th, 2013 18 Pages



Chapters Page No.

Introduction 3

Objectives 5

History and Development 6

Supersession of carburetor 10

Basic function 13

Fundamentals of fuel injection 15

Various injection system 18

Conclusion 22

Reference 23

I was commuting with my friends back from college one evening when one of them asked me: What is an MPFI Engine?
You must have seen cars with specifications which mention words like MPFI and CRDI or CRDE. To an automotive engineer or enthusiast, it means something, but for a common man, it may not make much sense.
MPFI means –
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Because of its greater immunity to wildly changing g-forces on the engine, the concept was adapted for use in gasoline-powered aircraft during World War II, and direct injection was employed in some notable designs like the Junkers Jumo 210, the Daimler-Benz DB 601, the BMW 801, the Shvetsov ASh-82FN (M-82FN) and later versions of the Wright R-3350 used in the B-29 Superfortress.


The term Mechanical when applied to fuel injection is used to indicate that metering functions of the fuel injection (how the correct amount of fuel for any given situation is determined and delivered) is not achieved electronically but rather through mechanical means alone.
In the 1940s, hot rodder Stuart Hilborn offered mechanical injection for racers, salt cars, and midgets.
One of the first commercial gasoline injection systems was a mechanical system developed by Bosch and introduced in 1952 on the Goliath GP700 and Gutbrod Superior 600. This was basically a high pressure diesel direct-injection pump with an intake throttle valve set up. This system used a normal gasoline fuel pump, to provide fuel to a mechanically driven injection pump, which had separate plungers per injector to deliver a very high injection pressure directly into the combustion chamber.
[pic] [pic]
Goliath GP700 Carrera 3.0

Another mechanical system, also by Bosch, but injecting the fuel into the port above the intake valve was later used
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