Technology advances for Porsche engines

  • 10-Jan-2009 07:47 EST
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A 3.0-L Audi diesel will power the Porsche Cayenne.

Big changes for Porsche’s second-generation Boxster and Cayman sports cars reflect the engine technology developments for the 911, with upgrades bringing more power and better fuel efficiency to the flat-six units. The models are also available with Porsche’s PDK (Doppelkupplungsgetriebe) double-clutch gearbox.

Less weight, lower frictional losses, and lighter moving masses all contribute to enhanced efficiency. A two-piece crankcase with integrated crankcase bearings replaces the former four-piece block with separate bearing case. The engines provide a “higher standard of thermal and mechanical robustness,” says Porsche.

The former 2.7-L engines are upped to 2.9 L with a power output of 188 kW (252 hp) in the Boxster and 195 kW (261 hp) in the Cayman. The 3.4-L power unit in the S-versions of each model get 120-bar (1740-psi) DFI (direct fuel injection) to help produce 228 kW (306 hp) in the Boxster S and 235 kW (315 hp) in the Cayman S. The Cayman S with PDK and Launch Control featured in the optional Sports Chrono Package makes 0-100 km/h (0-62 mph) in 4.9 s.

Fitted with PDK, both the Boxster and the Cayman for the first time outperform the 9.0 L/100 km consumption mark, stated Porsche. Both models with the new 2.9-L Boxer engine achieve 8.9 L/100 km—11% less than the former models with Tiptronic S. The 3.4-L versions with PDK see reduced fuel consumption by 16% to 9.2 L/100 km. CO2 with PDK fitted is 221 g/km. Power-to-weight ratio of the Cayman S is 4.2 kg/bhp and output per liter is 68.4 kW (91.7 hp). Maximum revs for the Cayman S rise to 7500 rpm. Maximum torque is up 30 N·m (22 lb·ft) to 320 N·m (236 lb·ft). Compression ratio is 12.5:1.

Porsche is also to introduce its first diesel engine—supplied by Audi—in February. It will be offered in the Cayenne. This decision was taken in response to changed legal regulations, especially in European markets, resulting in tax incentives for vehicles with diesel engines, stated Porsche.

The company added that its stake in the Volkswagen Group, which claims to be the world’s largest manufacturer of modern diesel engines for passenger cars and includes Audi, had opened up new opportunities to use diesel technology.

The Cayenne will be offered with Audi’s 3.0-L V6 turbodiesel producing 176 kW (236 hp). The average consumption of the Cayenne diesel is 9.3 L/100km, with CO2 emissions of 244 g/km.

The spontaneous throttle response and the high torque characteristics of this diesel engine deliver the required performance levels for a sporty all-terrain vehicle such as the Cayenne, claims Porsche. The maximum torque of 550 N·m (406 lb·ft) is said to complement sporty chassis dynamics.

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