Suppliers pushing competing diesel injector types to clean up diesels
The traditional electromagnetic solenoid injector is well developed but most companies don't believe they can be improved enough to achieve new requirements. The piezo injectors have more potential for development, but are more expensive to make. They also have a noise advantage over the solenoid injectors, especially at the extremely high 29,000 psi pressures being used in modern diesel engines. The critical deciding factor will be the upcoming Euro 6 diesel emissions standard. If the solenoid injectors are not able to meet the next generation standard, expected to go in effect for 2014, then piezo injectors will likely be only choice.
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