Bye Bye Turbos, Porsche Cayman GT4 Will Get Naturally Aspirated Flat-Six

Sports Car

Finally the Cayman will be getting its voice back after losing it to a turbo four-cylinder.

Given that the 911 GT3 can make 500 horsepower using 4.0-liters bored out of six opposing cylinders lying on their bellies without even using forced induction, it’s safe to say that Porsche knows a thing or two about getting the most out of its engines. That, along with strict fuel economy standards, meant that many were displeased but none were surprised when Porsche announced that the 718 Cayman and Boxster would get getting a turbocharged four-cylinder, but as Car and Driver points out, that leads to one main issue.

Namely, if the German automaker is already squeezing 350 horsepower out of 2.5-liters using a turbocharger, how did it expect to get any more out of the block for subsequent GT4 model? According to C&D’s interview with Porsche GT development boss Andreas Preuninger, it won’t. Instead of relying on a small four-cylinder engine to deliver amounts of power that put reliability on the back burner, it will upsize the new Cayman GT4 to a six-cylinder. While Preuninger didn’t actually give any details about the GT4 engine, his comments leave no other alternative. Better still is that Preuninger claims that any forced induction alternative should be off the table due to a lack of emotion.

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“Natural aspiration is one of our main selling propositions,” Preuninger said. “We offer a car for people who want to feel something special, who want to have as much emotion as possible, as much throttle response and immediacy from a sports-car engine. And at Motorsport we think that can be achieved a little bit better with a [naturally aspirated] high-revving engine than any kind of turbo.” The only problem now is that most of the current 911 lineup also has turbochargers force-feeding its inline-six engines, meaning Porsche will have to reach even higher for a naturally-aspirated six-pot. Rumors of this emerged February when an Australian dealership leaked information about a 4.0-liter flat-six Cayman GT4 RS.

This would likely be the same 4.0-liter inside the current 911 GT3 that just beat its predecessor's Nurburgring lap time by a metaphorical mile, but Porsche would likely tune it down from its 500 horsepower perch. Following a trend that’s becoming the norm at Porsche, this isn't the end of the good news because unlike the upcoming 911 GT3 RS, the Cayman GT4 or GT4 RS will not lose its manual transmission, though it could gain a PDK option. You can count this enthusiast satisfied. More so if a Cayman GT4 ends up in our press fleet.