11/18/2023 0 Comments Bosch piezo injectorIn a piezo injector, the electronic engine management system sends an electrical signal to the valve, much like the solenoid operated valve. Since this movement is a downward motion, a lever and spring setup inside the injector allows the pintle to open and close. The actual movement is microscopic, but enough to make the piezo element act as the valve. This translates into precise fuel metering and allows for multiple injector events to occur each combustion cycle.Ī piezo element only expands a miniscule amount, so hundreds of slices are stacked on top of each other so that the net movement is only about 0.004 inch. Modern BMW piezo injectorsĪlthough manufacturers such as Bosch, Siemens, and Delphi are all working on a solenoid based injector design that will perform as well as the piezo type, we will focus on the latter as these injectors are what you will encounter most often.Īccording to Bosch, which introduced piezo injectors to the industry, a piezo actuator acts up to five times faster than a standard injector solenoid and the motion is frictionless. But before we get into that, let’s delve into what makes the modern BMW injector work. BMW made the switch to direct injection for good reason - namely, improved fuel efficiency, lower emissions, better performance, and cooler cylinder temperatures. In 2007 BMW introduced the N54 engine featuring direct injection and turbocharging on the 335i model.īMW’s current lineup features almost all turbocharged and direct injected engines. However they did not implement DI in automotive applications until the mid 2000s. Direct injection is not all that new.īMW used direct injection in airplane engines in the 1930s. Port injection has been phased out and you will mostly see the direct type injectors in the field. When we discuss BMW fuel injectors we will focus primarily on the direct injection type or GDI. Understanding new technology is the key to successful repairs.
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