From Wikipedia, the free encyclopedia
Reciprocating internal combustion engine
Porsche flat-6 engine
Flat-6 engine in an older air-cooled 911
The Porsche flat-six engine series is a line of mechanically similar,
naturally aspirated and sometimes
turbocharged ,
flat-six
boxer engines , produced by
Porsche for almost 60 consecutive years, since 1963.
[8]
[9] The engine is an evolution of the
flat-four
boxer used in the original
Volkswagen Beetle .
[10]
[11]
[12]
The flat-six engine is most often associated with their
911 model , Porsche's flagship rear-engined sports car which has used flat-six engines exclusively since 1963.
[13] The engines were
air-cooled until 1999, when Porsche started using
water-cooled engines .
[14]
[15]
[16]
[17]
In April 2011, Porsche announced the third generation of the 997 GT3 RS with an enlarged 4.0-litre engine having a power output of 500 PS (368 kW; 493 hp). The
naturally-aspirated 4.0-litre flat-six engine (the largest engine offered in a street-legal 911) was introduced with their
911 (997) GT3 RS 4.0 , in 2011.
[18] The engine itself uses the crankshaft from the RSR with increased stroke dimensions (from 76.4 mm to 80.4 mm). This change increased the power output to 500 PS (368 kW; 493 hp) at 8,250 rpm and 460 N⋅m (339 lbf⋅ft) of torque at 5,750 rpm.
[19] giving it a
power-to-weight ratio of 365 hp per ton. Only 600 cars were built.
[18]
[20] At 493 hp (368 kW),
[21] the engine is one of the most powerful six-cylinder naturally aspirated engines in any production car with a 123.25 hp (92 kW) per litre output.
[22]
[6]
[23]
[24]
[25]
Other Porsche models that use flat-six engines are the 1970–1972
Porsche 914/6 (
mid-engine ), the 1986–1993
Porsche 959 (
rear-engine ), and the 1996–2021
Porsche Boxster/Cayman (mid-engine).
[26]
[27]
[28]
The
Porsche 962
sports prototype also used a
twin-turbocharged flat-six engine.
[29]
[30]
[31]
[32]
Applications
Road cars
Porsche
Race cars
References
^
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^
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^
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^
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^
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^
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^
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^
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^
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