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Tech Corner


  • Basic Overview Of Electronic Fuel Injection The purpose of Multi-Port Electronic Fuel Injection (MPI) is to supply a precise amount of fuel to an engine’s cylinders in order to properly operate the engine at a particular moment.  Since the engine’s condition is constantly changing (RPM, load, temperature, etc.), the amount of fuel that is injected into each cylinder must change along with the engine’s requirements. [read more...]

  • Fuel Injectors A fuel injector is basically an electronic solenoid valve which, when activated, allows pressurized fuel to escape through a nozzle. [read more...]

  • Injector Spray Styles There are several types of Multi-Port fuel injectors.  In general, all injector designs are similar.  Some are optimized for specific characteristics such as fuel metering, valve response time, low pulse width linearity, and so on. [read more...]
  • Injector Compatibility with ECU's  — Fuel injectors are controlled by one of two possible injector control circuits called drivers: saturated (high impedance) and peak-and-hold (low impedance or current regulated). [read more...]
  • Injector Size (Flow Rate) SelectionA formula can be used to help determine an injector flow rate for a particular engine application. This formula is only as accurate as the input values used in the calculation.  It is at this point that you must determine an honest and realistic horsepower estimate. [read more...]
  • Injector Flow Rates at Different PressuresOnce an injector is manufactured, the flow rate can not be altered.  Flow rates can only be changed on a limited basis by raising or lowering the system’s fuel pressure set point (the measured pressure with no vacuum or pressure on the regulator to manifold port). [read more...]
  • Fuel Pressure and Manifold VAC/Press InterfaceOne of the most commonly confused functions of the fuel supply system is the interaction of manifold Vac/Press and the fuel pressure regulator.  Simply stated, the function of the fuel pressure regulator is to maintain a constant pressure at the fuel injector’s metering orifice. [read more...]
  • Importance Of Injector Flow MatchingInjector flow-matching, also called blueprinting, is an excellent means to improve the engine’s performance and efficiency.  Since each cylinder is essentially metered individually, it only makes sense that the engine would perform better if each cylinder received the exact same amount of fuel.  [read more...]
  • EFI Fuel Pump SelectionVarious factors must be considered when selecting an electric fuel pump for an EFI system, or if you are just trying to determine whether your existing fuel pump can handle horsepower increases to the powertrain. [read more...]
  • Fuel Pressure Leak-Down TestAn area often overlooked is the performance of the fuel system not while the engine is running, but when it is shut off. If you experience hard starts especially restarting a short period after shutting off the engine, then one possibility is a leaking fuel system. [read more...]


Coming soon...more tech articles.


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