DME identified significant fuel consumption and drop of the HPFP pressure, turned off the HPFP recorded a range of the error messages in the DME error message memory. The engines successfully run even in a Stratified charge! Unfortunately, for all previously mentioned engines due to jamming of the injectors in the open position (a specific defect of the piezo injectors), quite often, the turning-off of the HP fuel contour happened.
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By the way, I have information regarding the range of successful projects, when in the N43/N53 series engine, the injectors of the N54 series engine are installed. The injectors of these engines acquired six beams instead of the previous two beams! It provides better fulfillment of cylinders with the fuel. Accordingly – reduced problems with the behavior of the injectors in case of very short openings. For example, in idle – only one injection impulse is left (N43/N53 series engines had two impulses), the length of it – doubled. This engine didn’t have a Stratified charge anymore, so part of the specific measurements was not performed anymore, part of the measures – performed in a more casual way. Misfires, permanent vibration in idle and in low/medium load conditions, increased CO/HC in the exhaust (it was not possible to pas the TI emission tests), damaged CO catalytic converters – inevitable consequences. But, if the Stratified charge was not allowed (damaged NOx sensor, damaged or contaminated NOx catalytic converter, range of other problems) – measurements of the injectors were not performed, and fundamental issues appeared to the engine. Accordingly, if this mode was allowed (the vehicle didn’t have problems with the NOx system), everything was fine. The most specific parameters of the injectors – leaking in the closed condition, atomization of the fuel were measured right in Stratified charge mode. Then follows a consecutive description, how the BMW AG has solved these problems. Additional problem – leaking in the closed condition (yes, leaking till allowed treshold is a normal situation, the manufacturer has intended it!). And the story can begin.Īs I already have mentioned in many other entries, the weak spot of the piezo injectors – a wide scattering of the parameters by short opening times (it means, in idle and in low load driving conditions). At this moment, piezo injectors appeared in the BMW petrol engine. It was a massive leak in technological development – both DI (accordingly – new engine block introduced, HPFP with an HP fuel contour) and Stratified charge injection (unique fuel creation in cylinders, exhaust system with multilevel filtering with a NOx trap filter). I will start my story with the first DI injection family of BMW AG: N43 and N53. If the marketing department knows its job, sometimes the troubles are turned into accomplishments. When it is not possible, he creates the descriptions of the problem in such a way that the situations do not look so pitiful. Why I put an accent to “is available”? Because it is clear that each manufacturer tries to hide his problems. Whether you are working with Danio rerio (zebrafish), Xenopus, Drosophila or Caenorhabditis elegans, we can help you customize a microinjection system for your application.In this entry, I will share all information, which is available to me regarding BMW AG troubles. In addition, we offer an electroporator for transfection procedures. The setup you choose depends on the size of your microinjection aliquots, the volume to be injected and the size of needle or glass tip you choose. WPI offers a variety of pumps along with special syringes, stereotaxic frames, glass capillaries and needles. LED lighted microscope base with a PZMIII Stereo Microscope and an articulating mirror Microinjection pump like the PV850 Microinjector with External Pressure Source
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A stereotaxic frame setup may be required. Typically, microinjection is performed under a microscope. For example, genetic material may be inserted into a living cell, a drug introduced into an eye or brain, or fluid injected into a muscle. Microinjection processes use either metal microinjection needles or glass micropipettes to inject small liquid volumes.