![]() While the direct-injection flat sixes are essentially still a 3.6 and a 3.8, the smaller engine is more oversquare than before (with a larger 97.0mm bore and shorter 81.5mm stroke for 3614cc), while the harder-edged 3.8 is dramatically more oversquare (running a 102.0mm bore and a much-shorter 77.5mm stroke for exactly 3800cc). Previously, both capacities shared the same 82.8mm stroke, but the 3.8 ran a 99.0mm bore - 3.0mm larger than the 3.6’s. On paper, the most obvious change is to the engine’s bore and stroke configuration. Cylinder head, pistons, conrod, crankshaft, induction system, exhaust system, oil system, engine case, you name it, they’re different. Europe’s strict Euro 5 emissions standard drove the changes, but we are happy Porsche pulled the trigger because this engine is a beauty. Not one single component has been carried over from the existing 3.6- and 3.8-litre flat sixes that have powered the Carrera and Carrera S 911s since 2004. PDK improves acceleration while reducing fuel consumption over the previous generation of Tiptronic S equipped 911s through optimized and adaptive gearshifts.īoth direct-injection 911 engines are all-new. Since Porsche’s double-clutch also boasts an automatic gearshift function, it replaces the former Porsche Tiptronic S automatic transmission on both the Carrera and Carrera S. The seven speed gearbox combines the driving comfort of an automatic transmission with the gearshift capacity of a sequential gearbox used in race cars. The new generation 911 is available for the first time with the new Porsche-Doppelkupplung (PDK), Porsche’s double-clutch gearbox. With this extra power, the Carrera S now offers a top speed of 187 mph. The 911 Carrera S with its 3.8-liter engine has been upgraded for 2009 with the addition of an extra 30 horsepower.
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