BMW (UK) Ltd Product Marketing January 2007 Page 27
The new BMW 5 Series Engines – 523i/525i/530i
All 6-cylinder petrol engines will now be powered by the new N53 engine which combines dynamic and sophisticated driving performance with efficient fuel consumption and reduced emissions. The HPI combustion process (High- precision direct injection) in the N53 is characterised by its central location of the injector and spark plug in the combustion chamber. The location of these components and the piezo technology of the injector enable a reduction in fuel consumption by an average of 14% compared to VALVETRONIC in the NG6 engines (eg. N52 engine).
Innovations of the new N53 engine
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B High-precision direct injection with 200bar pressure Piezo injector High pressure pump Magnesium crankcase Electrical water pump Oil level sensor Differentiated suction unit (DISA) I - V A N O S