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2009 Mercedes-Benz SL 65 AMG
The new SL 65 AMG features dramatic new styling with fenders that incorporate bold new headlamps and modified gill-type air outlets behind the front wheels. A redesigned hood with twin power domes and a wider, single-bar grille emphasizes the width of the body and makes a symbolic visual connection to the famous 1954 300SL. Standard AMG body styling further enhances the aggressive new appearance. 604-Horsepower V12 Engine Mercedes-AMG, the high-performance division of Mercedes-Benz, has developed the most powerful engine ever installed in a production car. Developing 604 horsepower, the limited-production V12 models can accelerate from 0 to 60 miles per hour in a breathtaking 4.2 seconds, and their potential top speed is significantly higher than the 155 mph of their electronic speed limiters. Perhaps more important in everyday driving than sheer horsepower is the twin-turbo’s enormous peak torque of 738 lb.-ft., available on a wide plateau from 2,000 to 4,000 rpm. A Major Boost for Mercedes V12 Power The standard 5,439-cc Mercedes-Benz V12 engine has been enlarged by installing a special crankshaft that increases the piston stroke from 87 to 93 millimeters. With larger heat-resistant forged pistons (up from 80 to 82.6 mm) as well, the AMG 12-cylinder now displaces 5,980 cubic centimeters, or about 365 cubic inches. To provide more fuel and air for the larger engine, new AMG camshafts provide higher intake valve lift and longer opening duration, and fuel injectors with larger orifices are used in conjunction with higher fuel pressure – 3.8 bar or 54 pounds per square inch. What’s more, larger turbochargers pack more air into the cylinders, with maximum turbocharger boost now set at 1.5 bar (22 psi). Hot V12 Engine Stays Cool Air that’s pressurized by the turbochargers gets hot as a result, so it’s circulated through a special water-cooled intercooler before entering the engine. A dedicated radiator for the intercooler is 70 percent larger, resulting in intake air temperatures that run about 25 percent cooler than the standard engine. The denser intake air plays a major role in increasing the engine’s horsepower and torque. All this additional power means a lot more heat, so new oil jets in the aluminum block spray more oil onto the underside of each piston. A larger oil cooler complements a larger oil pump, which circulates more cooling oil throughout the engine. One Man, One Engine Technicians at Mercedes-AMG build every engine by hand, ensuring the closest possible tolerances. Individual workmanship and skill count here: each technician is responsible for a complete engine, from the installation of the crankshaft in the engine block to the assembly of the camshafts as well as a wire harness and oil fill-up. Each completed engine is affixed with a plaque signed by the technician who built it and is bench-tested to ensure maximum performance. New Audio Technology With its 6.5-inch color display screen, the standard COMAND system with GPS navigation has been refined with a new multimedia interface and a four gigabyte hard drive as well as an integrated six-disc CD-DVD player and a Music Register for around 1,000 MP3 tracks. The interface makes it easy to connect an iPod, USB stick, memory card and other devices. Music tracks can be indicated on the COMAND display located on the center console as well as a smaller display in the center of the instrument cluster, and they can be selected easily using the buttons on the multi-function steering wheel. Bluetooth-enabled cell phones will work hands-free – even with the phone in a pocket or purse, the audio is automatically muted when a call is made or received, and callers are heard over the audio system speakers. In addition, phone address book info can be displayed by the COMAND system. From Coupe to Roadster in 16 Seconds At the push of a button, the SL’s retractable hardtop can be fully opened or closed in just 16 seconds, transforming the car from a quiet, weather-tight coupe to a top-down, open-air convertible. A hydraulic pump and 11 computer-controlled hydraulic cylinders power the system, and roof operation is controlled by a switch on the center console. A clever folding design allows for a surprisingly large cargo area of 7.2 cubic feet when the top is down. With the top up, the trunk holds 10.2 cubic feet. ABC Active Suspension The SL chassis uses a fully independent, double-control-arm front suspension and the patented Mercedes-Benz five-link rear suspension. All SL models come with second-generation Active Body Control (ABC), the Mercedes-Benz active-suspension technology that virtually eliminates body roll in cornering, squat under acceleration and dive during braking. Mercedes-Benz engineers use ABC’s interplay of hydraulic, electronic and mechanical parts to reduce body roll by 68 percent (compared to the same vehicle with a conventional suspension), providing the driver with needed feedback through the vehicle chassis. A ‘Sport’ switch on the center console can make it 95 percent reduced roll, along with tighter shock damping. Active suspension solves the usual tradeoff between ride comfort and handling precision, so SL roadsters offer excellent comfort and league-leading handling. Updated 01:53 PM - July 05, 2008
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