Not only have you never heard of it, it never even saw daylight - and it's unlike any Porsche you can imagine.

The Holden is fitted with a gargantuan 1,172.8cc flat-four engine, representing one of the earliest experiments in high-cylinder motorcycle design. Talk about the sheer audacity of packaging four ...

Since 1963, an air-cooled (later water-cooled) six-cylinder boxer engine has been used in a car so iconic that both its engine placement and configuration have largely remained unchanged. It's the ...

From the eyes of the casual observer, Porsche's entire identity is marked by the flat-6 engine. That's hardly surprising, as it's the engine configuration of choice for Porsche's most popular ...