Singer, the re-imaginer of 964 Porsche 911s, has made a new engine with engine specialists Cosworth. The 4.0-liter flat -six sports four valves per cylinder, revs to 8,000 rpm, and makes 420 hp.Early prototype crankshaft and connecting rods for the 4.0-liter, four-valves per cylinder, naturally aspirated flat-six.Underside view of prototype piston head.Topside view of prototype piston head.External view of a prototype cylinder barrel and engine valvetrain.External view of prototype valvetrain, showcasing the four valves per cylinderVariable-valve timing mechanism.Overhead view of the reimagined 4.0-liter flat-six mounted on the dynamometer, showing the prototype, electrically powered fan which has been re-positioned to optimize distribution of cool air across the cylinders.Singer’s Chief Test Driver, Marino Franchitti, and Cosworth’s Managing Director, Bruce Wood, discuss the engine development.Singer’s Chief Test Driver, Marino Franchitti, and Cosworth’s Managing Director, Bruce Wood, in discussion with prototype components.Detailed view of a prototype carbon-fiber intake manifold, which feeds air into the cylinder barrel and provides a mounting point for the fuel injector.Detailed view of the underside of a prototype cylinder head, displaying the four-valve system utilized to optimizes gas exchange in the reimagined flat-six.Overhead view of the early prototype carbon-fiber intake plenum.Detailed view of prototype overhead camshaft, with variable-valve timing modules.Overhead view of a prototype four-valve piston head within the cylinder barrel.Franchitti with the engine in a Cosworth dyno room.A development engine mounted on the dynamometer.Franchitti and Wood with a development engine on the dynamometer.Franchitti and Wood outside the engine testing bay at Cosworth’s UK facility.Franchitti and Wood at Cosworth’s UK facility.Detailed view of variable-valve timing modules, mounted to the prototype dual overhead camshafts.