Vehicle details
Like its predecessor, the 968 was offered in coup and convertible bodystyles.[6] The 968 was powered by an updated version of the 944s straight-four engine, now displacing 3.0 L with a 104 mm bore and an 88 mm stroke and rated at 240 PS (177 kW; 237 hp) at 6, 200 rpm and 305 Nm (225 lbft) of torque at 4, 100 rpm. Modifications to the engine include a higher 11.0:1 compression ratio, lighter crankshaft, crankcase and pistons along with revised intake valves and intake manifold. Changes to the 968s powertrain also included the addition of Porsches then-new VarioCam variable valve timing system, newly optimized induction and exhaust systems, a dual-mass flywheel, and updated engine management electronics. The 968s engine was the fourth-largest four-cylinder engine ever offered in a production car at that time. A new 6-speed manual transmission replaced the 944s old 5-speed, and Porsches dual-mode 4-speed Tiptronic automatic became an available option. Both the VarioCam timing system and Tiptronic transmission were very recent developments for Porsche. The Tiptronic transmission had debuted for the first time only 3 years prior to the debut of the 968, on the 1989 Type 964 911. The VarioCam timing system was first introduced on the 968 and would later become a feature of the Type 993 air-cooled six-cylinder engine.[7][8][9] Much of the 968s chassis was carried over from the 944 S2, which in itself shared many components with the 944 Turbo (internally numbered 951) due to lack of development funds at the time. Borrowed components include the Brembo-sourced four-piston brake calipers on all four wheels with ventilated brake rotors, ABS, aluminium semi-trailing arms and aluminum front A-arms, used in a Macpherson strut arrangement. The steel unibody structure was also very similar to that of the previous models. Porsche maintained that 80% of the car was new.[10][11][12] The 968 can attain a top speed of 252 km/h (157 mph) when equipped with the manual transmission and has a 0100 km/h (62 mph) acceleration time of 6.5 seconds.[13] For the 1993 model year, the 968 received minor changes which included a pollen filter to increase the cleanliness of the air being channeled through the air conditioner and the introduction of special packages. The seat package included heated driver and front passenger seats, the sound package included an additional amplifier in the coup and two additional speakers installed at the rear in the convertible while the suspension package included larger 17-inch wheels and an improved braking system with cross-drilled brake discs.[14]