Table of Contents
What is sequential direct injection?
Basically, a SFI (sequential fuel injection) system has a fuel injector for each cylinder. DI (Direct Injection) is the next evolution of fuel injection where the fuel is injected after the intake valve directly into each cylinder at over 3000 psi.
Is sequential fuel injection better?
Sequential Fuel Injection This system is more efficient than a multiport system because changes to the fuel mixture are instantaneous. Most of today’s engines have sequential fuel injection systems. The ECM controls the injectors by pulse width, the length of time the injector sprays fuel into the port.
What’s the difference between SFI and MFI?
sfi = sequential fuel inj or throttle body which means all the air and fuel go through the t-body together. mfi=multi port inj which means each cylinder has its own seperate fuel injector,no more valves or anything but it does add up to about 15 or 20 more hp and is usually a little better on fuel mileage.
What is multi port fuel injection system?
A sequential fuel injection is a type of multi-port fuel injection system in which each injection valve will open just before the cylinder intake valve opens. So in essence, the individual injectors work by themselves because they are fired individually.
What is multi point fuel injection?
Multi-point fuel injection, or MPFI, is a gasoline delivery system that uses four individual fuel injectors to evenly disperse gas into an engine´s combustion chambers. MPFI was developed to succeed the older single-point fuel injection systems.
What is central sequential fuel injection?
The Vortec Central Sequential Fuel Injection system utilizes a unique fuel injector for each cylinder. The injector coil is located in the central ‘spider’ with a tube sending the injected fuel to a poppet nozzle in the port of each cylinder.
What is sequential port injection?
Sequential Fuel Injection. Sequential fuel injection, also called sequential port fuel injection (SPFI) or timed injection, is a type of multiport injection. Though basic MPFI employs multiple injectors, they all spray their fuel at the same time or in groups.