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Sequential multi port injection9/8/2023 ![]() Thus, when the intake valve opens, the cylinder receives a ‘batch’ of fuel, so to speak. To ensure the engine receives the fuel it needs, a batched MPFI system injects fuel when the intake valve is open as well as when it is closed. At these high RPMs, standard sequential fuel injection systems won’t be able to adequately spray the fuel required by the engine to ensure combustion. Batched MPFI systemīatched MPFI systems are employed in race cars that function at high engine RPM speeds. This results in negligible fuel idling outside the intake valves and the maximum fuel is burnt for power generation, improving efficiency, power and reducing emission. In a sequential multi point fuel injection system every injector nozzle works independently and they are timed like spark plugs to spray the fuel immediately before or as their respective intake valves open. Types of Multi Point Fuel Injection System Sequential MPFI system The engine speed and load vary the pressure in the intake manifold. Meanwhile, the control diaphragm and pressure spring control the inlet valve opening and the amount of fuel that can return. The fuel pressure regulator is connected to the fuel rail and governs the fuel flow. In the system, multiple fuel injectors are situated upstream of the cylinders’ intake valves. As every cylinder has a specific injector, there is a negligible possibility of fuel condensation outside the intake manifold. These fuel injectors inject an optimum quantity of fuel into the combustion chamber, which also results in better atomization and swirl of fuel in the combustion chamber. In multi-point fuel injection (MPFI) technology, every cylinder in the combustion chamber of the engine is given an injector at the front of their inlet valves (outside the intake port), which is why it’s also called ‘Port Injection’. Due to the absence of electronic control, a carburettor cannot properly measure the air-fuel ratio with changing air pressure and fuel temperature Image Courtesy: LEARN AND GROW The carburettors mix the air-fuel in the required ratio, and supply it to the intake manifold. How Does the MPFI System work?īefore MPFI let’s learn a bit about carburettors. In this article, we learn what MPFIs are and how they function. The multi point fuel injection system is one of the best engineering marvels ever produced, and today, every petrol and CNG car, irrespective of its price, comes with MPFI. While carburettors used to do this duty until the mid-90s, it was in the late 90s when multi point fuel injection systems made their way to the Indian market, and then rapidly popularised themselves for their best efficiency. This allows a much more precise fuel control for better performance, fuel economy and emissions.By all odds, the engine is the most important part of any car, and its life very much depends upon the way fuel is supplied to it. With more sophisticated Sequential Fuel Injection (SFI) systems that were introduced later would fire each injector separately, normally just after the intake valve is opening. Most of the EFI systems used in the late 1980′s and early 1990′s operate by firing all injectors simultaneously with every revolution of the crankshaft. In today’s vehicles, all production fuel injection systems are fully electronic with computer controls and electronic injectors (EFI). ![]() In the late 1970′s fuel injection systems such as the Bosch L-Jetronic systems replaced mechanical injectors with electronic injectors. When air flows through the intake manifold, the intake manifold remains dry and there are no problems with fuel puddling or fuel separation causing uneven fuel mixtures in the center and end cylinders. MultiPort Injection allows the fuel mixture to be uniform in all of the cylinders for better fuel economy, emissions and performance.Įarly production Multiport fuel injection systems were mechanical rather than electronic and date back to the 1950′s. ![]() MultiPort Injection systems use separate fuel injector for each cylinder so that fuel can be sprayed directly into the cylinder head intake port. ![]()
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