Both the 911 Turbo and 911 GT2 are will get the new 3.6-litre version of the horizontally-opposed, six-cylinder A91, with a 97.0mm bore and 81.5mm stroke (compared with the old engine’s 100mm x 76.4mm). This ultra-modern direct injection unit also gets twin turbochargers and intercoolers.
Official power figures are yet to be revealed, but Autocar sources suggest a 20bhp increase over the old cars, taking the four-wheel drive 911 Turbo up to 500bhp and the rear-wheel drive 911 GT2 to around 550bhp.
The updated rear-wheel drive 911 GT3 will get a naturally-aspirated 3.8-litre version of the A91 engine with 102mm bore and 77.5mm stroke. It will receive a number of internal revisions over the engine used in the 911 Carrera S, including lightweight pistons. This should push power from today’s 415bhp to nearer 430bhp.