Tech Department: Piezo Fuel Injectors Explained. If you’ve ever seen the sparks created by someone munching Wint- O- Green Life Savers in a darkened room, you’ll have witnessed this phenomenon: Certain crystalline materials, such as sugar, produce minute amounts of electricity when you squeeze them. There’s even a word for it: “piezoelectric,” which describes electricity resulting from pressure. But the process is also reversible, in that these same materials expand slightly when electricity is applied to them. There are numerous places in a car where piezoelectric expansion can come in handy. Bosch, Continental, and Delphi, among others, have harnessed this peculiar property of expanding piezo material—rather than the usual electromagnet—to open the fuel- injector nozzle and precisely spray fuel into both gasoline and diesel engines. Making these devices work, however, isn’t easy. A slice of piezo material two- hundredths of an inch thick expands only about 0. That two- hundred- thousandths of an inch is not nearly enough to move an injector’s pintle, which is the part that seals the nozzle and must open to inject fuel. The stack produces 0. But because this motion is in the wrong direction—down, not up—the addition of two tiny levers allows the expansion of the piezo stack to cause the pintle to be lifted and the fuel spray to begin. When the injection is complete, the voltage cuts off, the piezo stack shrinks, and a spring closes the pintle. How HEUI Injectors Work. A hydraulic electric unit injector applies the relationship between force, pressure, and area in order to create relatively high fuel. Piezoelectric injectors offer more-accurate control over fuel delivery. Explore the benefits of this engine technology at Car and Driver. Back to dieselmann's Page PowerStroke Page Tech Page. Diesel Injector Service; For all of your diesel engine needs: Injection systems, filters, O-ring kits. How Does An Injector Driver WorkforceHow Does An Injector Driver WorksFor one thing, they open and close much faster than conventional injectors. That makes for more precise control of the injection interval, which determines how much fuel is sprayed into the engine. Piezo units also provide feedback by producing minute fluctuations in the electricity used to activate them. For example, if the engine- control computer calls for an injector- opening time of 0. Such precise fuel metering makes for improved combustion, which leads to better fuel economy and reduced emissions. For one thing, by applying a little less electricity, the piezo crystals expand less so the injectors can open partway. A smaller opening means a longer injection time, which is beneficial when trying to accurately inject a tiny amount of fuel, such as when a car is nearly coasting. Because they act so quickly, piezo injectors also can inject several times (as many as seven in some diesels) during a single combustion cycle. This flexibility can reduce emissions in all engines as well as limit soot in diesels. And Continental, for one, says that its piezo units don’t cost more than the less capable conventional equivalents.
Piezo injectors are one of the key devices that will keep internal combustions competitive against these pesky electric upstarts for years to come. Fuel Injector Service - - Pro Flow. We offer advanced Fuel Injector Diagnostics, Testing & Cleaning Service. Your fuel injectors’ Fuel Distribution, Fuel Droplet Formation, Fuel Atomization and Fuel Delivery, are all visually and physically checked and tested as a starting point, rather than a last resort. The injectors are then Ultrasonically cleaned and the rubber sealing rings, plastic protection caps and filter baskets are replaced, before re- testing, ensuring all the injectors are performing as a matched and balanced set. Without “Fuel Injector Diagnostics”, it is impossible for garages to correctly, economically or efficiently, solve problems with Fuel Injected engines. Servicing Injectors will also save time and money on Service and Repair bills, prolong the life of Inlet & Exhaust Valves, Piston Compression Rings, Oxygen Sensors and the Catalytic Exhaust System. Our state- of- the- art ASNU equipment is approved World Wide by: Bosch Gmb. H and Delphi Automotive. Attention Motorsports Enthusiasts. You may have a national level race machine, or a stock machine for street use and the occasional track day. For less than the price of a rear tire, you can know if your fuel injectors are flowing equally and as much as they can, with a good spray pattern. Don’t spend $2. 50 and up for dyno time without knowing if you have totally clean injectors that will flow equally with good spray patterns. Mapping devices control only the lower injectors at one time (or all upper and all lower with Bazzaz) and this results in some lean cylinders and some rich cylinders as the dyno attempts to correct the OVERALL air/fuel ratio. Ultrasonic fuel injector cleaning and bench flow testing gets the fuel injectors flowing back to factory spec for better atomization of the fuel. This results in max power, better throttle response and a cooler operating motor. Get started today by giving us a call at: (8.
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