We're talking about the Porsche Type 901 (see photo ... We still don't know all there is to know about it. The engine is an air-cooled flat six of 1991 cc (80mm bore, 66mm stroke) with two ...

Porsche hasn't offered a four-cylinder engine since the 968 went out of production in 1995 – the better part of two decades ago. There'd been talk of a four-pot Boxster or an even smaller model ...