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Porsche : Porsche 911 Carrera 4
Subtle exterior differences that distinguish the 911 Carrera 4 models from their rear-wheel drive siblings include a different wheel design than the standard 911 Carrera, as well as plainly visible titanium-color brake calipers. The rear engine hood carries a titanium-color “Carrera 4” logotype. The 3.4-liter six-cylinder boxer engine in the 911 Carrera 4 produces 300 horsepower @ 6,800 rpm. A dual-stage resonance air intake system boosts power and torque at midrange engine speeds. With 258 lb.-ft. of peak torque at 4,600 rpm and at least 220 lb.-ft. available between 2,700 rpm-7,000 rpm, the 911 Carrera 4 can accelerate from rest to 62 miles per hour (0-100 km/h) in just 5.2 seconds.
An aluminum cylinder block and heads make the engine light. Patented LOKASIL high-silicon cylinder liners help reduce friction and wear to such a level that Porsche can recommend a 15,000-mile (24,000 km) oil change interval and a 30,000-mile (48,000 km) oil filter change interval. The Porsche-patented VarioCam ® system helps boost low-end and mid-range torque by varying valve timing between 1,250-5,120 rpm. Sequential multi-port fuel injection features separate fuel mixture control for each cylinder bank, and a coil-on-plug (“distributorless”) ignition system provides quick response and reliable operation. The ME 7.2 engine control module incorporates the E-Gas electronic throttle. In place of a traditional throttle cable setup, E-Gas electronically transmits pedal position to the engine control unit. This system provides even sharper throttle response and ensures low emissions.
As in the previous 911 Carrera 4, the new-generation model uses an all-wheel drive system based on a viscous multi-plate clutch. The previous system located the viscous unit in the rear transaxle, which added weight to the rear. In the current 911 Carrera 4, Porsche located the viscous unit directly behind the front differential, which simplifies assembly and maintenance and moved some weight to the front. The front location allows Porsche to offer the optional Tiptronic S transmission in the 911 Carrera 4, because both the 911 Carrera and 911 Carrera 4 use the same transaxle. Porsche equips the 911 Carrera 4 with the advanced Porsche Stability Management system (PSM) as standard equipment. Porsche added PSM to the 911 Carrera option list for 2000, and for 2001 it’s available as an option on the Boxster and Boxster S models. Photos : Porsche AG
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