Porsche 911 GT3 RS 4.0: Giant with the largest engine ever in a Porsche 911

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The Porsche 911 has always been known as a giant killer, extracting a huge amount of power from a small displacement engine, but is some is good, more is better. At least that is what's behind--literally--the largest engine ever in a Porsche 911, the 911 GT3 RS 4.0 limited edition.

Only 600 cars will be made for distribution worldwide, the Porsche 911 GT3 RS 4.0 is not, at 4.0-liters, only the largest Porsche engine ever, but Porsche engineers also extracted the most horsepower-per-liter ever--125 hp per liter--from a naturally-aspirated Porsche flat-six engine. And it's not just size that generates that 500 hp. The 4.0-liter reaches that peak output at a zinging 8250 rpm. Expect to use, however. Maximum torque is 339 lb/ft way up at 5750 rpm.

To hang together at those speeds, the engine has forged pistons, connecting rods of titanium and as Porsche notes, "the crankshaft has been lifted unchanged from the 911 GT3 RSR race car." The GT3 RS 4.0 is available only with a six-speed manual transmission.

Porsche has tweaked the suspension with bits "typically encountered in motor racing", and Porsche has gone after weight like a politician cutting pork out of the budget. No, wait. Just the opposite. The Porsche 911 GT3 RS 4.0 uses carbon fiber bucket seats as well as carbon fiber front fenders and luggage compartment lid. Even the carpets have been "weight-optimized."

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