The New Six-Cylinder Naturally Aspirated Boxer Engine from Porsche

Autoren

Dipl.-Ing. Markus Baumann, Dipl.-Ing. Thomas Wasserbäch, Dr.-Ing. Ralf Schmidt, Dr.-Ing. Frederic Lauer, Dr. Ing. h.c. F. Porsche AG, Weissach

Zusammenfassung

Following on from the 9A2 flat engine modular system newly introduced in 2015 with the four- and six-cylinder turbo engines for use in the Porsche 911 and 718 models and then further developed in 2018 for the eighth generation of the 911 (type 992), a newly developed six-cylinder naturally aspirated engine has now been added to the 9A2 flat engine family from Porsche. The tried-and-tested modular system principle permits the manufacture of many components on the same production lines as well as compliance with the highest quality standards. The basic design of the combustion process with centrally arranged piezo-driven, outside opening nozzle as well as the complete redesign of the cylinder head and valve drive are the key differences in this unit. Accordingly, the engine peripherals were also adapted for use as a naturally aspirated engine in the mid-engine layout. The conflict between the emissions legislation and available installation space led to the development of the two-branch exhaust system with new catalytic converters, particulate filters and main muffler. In addition to systems such as thermal management and Auto Start Stop, intelligent partial engine operation is also employed. With a displacement of four liters, nominal power of 309 kW (420 PS), engine speeds of up to 8,000 rpm and the mid-engine layout, maximum driving pleasure, high efficiency and excellent day-to-day usability are combined once more.

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