5/3/2023 0 Comments Direct injector reampMany customers want to know why we do not test direct injectors at operating pressure. Why flow testing direct injectors at 72.5 psi or 5 Bar You will only be be responsible for return shipping. If the injector does not perform up to spec or we can not clean them, we will not charge you for the time spent on that injector. Insist your dealer/mechanic/technician send your dirty clogged or leaking direct fuel injectors to Injector RX for cleaning. Most direct injection fuel injectors are difficult and time consuming to remove and re-fit would you fit a set of injectors without ensuring they are working correctly? Our testing equipment allows us to critically examine direct injectors for correct electronic operation in response to changes in mS, RPM and proper atomization as well as the proper cleaning techniques that will allow us to restore your GDI injectors to original specification. A clogged direct injector or a set of dirty direct fuel injectors will cause a range of problems and in some instances even severe engine damage. This can be achieved by following proper injector cleaning and flow testing proceduresįuel Distribution and Atomization is equally critical to the engine’s performance, fuel economy and emission outputs. It is important that direct fuel injectors flow evenly. To maintain this kind of atomization it is important to include direct injection fuel injector cleaning in your maintenance schedule. Conventional injector would have a fuel droplet size of +/- 165 micron, where some GDI injectors would produce a fuel droplet of only +/- 65 micron. ![]() All direct injectors will atomize a much smaller fuel droplet size than a normal MPI injector. The importance of direct injection fuel injector cleaning.ĭepending on the engine requirements, this style of injectors can have varying types of spray patterns. ![]() Another work around is to route the engine breather through an oil catch can. Newer models such as the Subaru BRZ now make use of both direct injection and manifold injection to curb some of these problems. Engines start losing performance after 45000 miles and the only remedy on some models is costly because it requires removal of the cylinder head to remove the dirt buildup from the intake valves and ports. Direct Injection and Carbon Buildup!ĭirect injectors are prone to carbon build up and are affected by the hostile environment in the combustion chamber as well as ethanol, hydrocarbons and additives which forms part of today’s fuels.īecause there is no cleaning agent, such as gasoline, present to clean the valves from any debris the current drawback from direct injection systems in 4 cycle engines is the buildup of carbon and dirt behind the intake valves and ports. These engines use expensive high specification injectors, with Hitachi, Bosch, Denso and Siemens being the major suppliers. No more “Duty Cycle” as we have known it. As the fuel requirement increases, the injector remains at 7mS and the pump pressure increases to meet the demand, allowing the injector to open and close quickly and efficiently. With the sequential firing GDI systems, the injectors only opens to a maximum of 7mS. GDI or Gasoline Direct Injection enables the engine to operate at a stratified charge combustion, described by most of the vehicle manufacturers as an Ultra Lean Burn mode, giving a much improved fuel efficiency, great engine torque and reduced Exhaust Emission levels at low load. Optimax air injector injects both air and fuel at the same time into the cylinder Why use Gasoline Direct Fuel Injectors? To achieve these pressures, the gasoline is pressurized by a high pressure fuel pump that is mechanically driven and electronically controlled.Īlthough Optimax air injectors as well as E-Tec and Ficht injectors are considered direct injectors they operate at much lower fuel pressures. Direct injectors operate at fuel pressures that vary between 450 - 3000 Psi. ![]() Instead of delivering the fuel via an injector in the intake track before the intake valve, GDI or gasoline direct injected engines inject a very fine mist of fuel directly in to the combustion chamber hence the name Direct Injection.
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