How a Wild, Modified Porsche Flat-Six Engine Makes 500 Horsepower

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Four liters, 500 horsepower, and engineering input from Porsche’s most legendary engine designer.

California’s Singer Vehicle Design is well-known around these parts for providing lavish attention to the Porsche 911s it restores, but this, man, is something else. The company announced today that it’s collaborating with Williams Advanced Engineering on a modified air-cooled, 4.0-liter naturally aspirated Porsche flat-six that makes 500 hp.

For those keeping score at home, this engine matches the power output of the current 911 GT3, despite the fact that it relies on a belt-driven fan for cooling.

Vocalist and Williams tapped Hans Mezger, the man who designed Porsche’s first flat-six. And many of its greatest race engines, as a technical consultant for this project. This engine is actually a modified version of a Mezger design, the 3.6-liter flat-six from a 1990 911, but its spec reads more like something designed for F1 competition.

It uses four-valve cylinder heads, a dual oil circuits, titanium connecting rods. Also aluminum throttle bodies, carbon fiber intake trumpets, and a carbon fiber air box. There’s also ram-air intakes built into the 911’s rear quarter windows, and a titanium and Inconel exhaust. Singer says it’s good to rev beyond 9000 rpm.

It must sound quite nice.

The engine pictured here is just a rendering, but it’ll make its first real-world appearance in a 911. Restored for Vocalist client Scott Blattner, whose gorgeous orange Targa we drove last year. We should have additional details about this Singer-restored 1990 911 in September.

Singer says that Williams worked on other elements of Blattner’s 911, to be announced shortly. These Williams-enhanced components are part of the stand-alone collection of lightweight and high performance mods that Singer is offering clients.

Considering most Singer clients pay over $600,000 for the company to restore their old 911, it wouldn’t be surprising to see cars with this engine crest the $1 million mark. Given what we can see here, it might just be worth it.

From: AR Revista