California-based restoration and reimagining specialist Singer has shared further insight into the engine development of the Porsche 911 Carrera Coupe and Cabriolet Reimagined by Singer.
Rob Dickinson, Singer’s founder and creative director, said, “Our services reference the wide-bodied, naturally aspirated cars of the 1980s. The goal was to pursue the ultimate, naturally aspirated G model 911, reimagined for the 21st century in both coupe and cabriolet body styles.
“At the heart of the car, we wanted a remarkable flat-six, with optimized throttle response, the reward of thrilling horsepower at high revs, and prodigious torque throughout the rev range for maximum real-world driver engagement.
“To deliver this mission, we brought together our learnings from the last 15 years of working intimately with the 911 and partnered with Cosworth to bring their experience and capabilities to bear on the development process for a very special engine.”
Heritage and cutting-edge technology
The restoration process builds on Singer’s long experience with the Porsche 911 and insights from its Dynamics and Lightweighting Study (DLS) services, which developed the company’s first four-valve cylinder head. Singer continues to explore the performance potential of the Type 964 flat-six via ongoing optimization and the development of a revised four-valve cylinder head.
Singer has jointly developed the engine with Cosworth, which has used its experience in variable valve timing, combustion chamber design and intake and exhaust path.
The engine in the Porsche 911 Carrera Coupe and Cabriolet is the first engine restored by Singer to feature variable valve timing, optimizing drivability at low speeds, power at high revs and a more linear torque curve across the entire rev range. It is also the first naturally aspirated engine restored by Singer to use water-cooled cylinder heads combined with air-cooled cylinders and an electrically powered fan, using learnings from the DLS Turbo program.
Cosworth’s hypercar engine expertise has been applied throughout the development process – post-restoration, the engine’s internal components use ultra-low-friction surface coatings derived from top-level motorsport, supporting reliable operation at extreme speeds and loads.
The cylinder head also features fully machined intake and exhaust ports, along with precision-machined combustion chambers, to maximize performance and ensure consistent cylinder-to-cylinder repeatability.
The results
Together, these features enable the 4.0-liter flat-six to produce 420hp and deliver a broader torque curve across a wider range of engine speeds, while also supporting Singer’s expanding international restoration services.
The engine is capable of revving beyond 8,000rpm, and owners can specify an optimized 6-speed manual gearbox that sends power to the rear wheels. A raised gear shifter with an exposed mechanism is also available, as well as a new titanium exhaust system that improves gas flow and enhances the engine’s characteristic sound.
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