- AMG 6.0-litre V12 biturbo engine with 450 kW/612 hp and 1000 Nm
- AMG sports suspension based on Active Body Control
- AMG high-performance braking system and new 19-inch forged wheels
- Nappa leather upholstery in a new AMG V12 diamond-pattern design
Top of the line in the exclusive 12-cylinder roadster segment is the SL 65 AMG. Its AMG 6.0-litre V12 biturbo engine produces 450 kW/612 hp with maximum torque of 1000 Nm (738 lb-ft) – unrivalled figures even four years after the market launch. The SL 65 AMG accelerates from 0 to 100 km/h (62 mph) in just 4.2 seconds, impressive testimony to the outstanding power of the AMG V12 engine; top speed is 250 km/h/155 mph (electronically limited).This exclusive dynamism is down to the outstanding power of the 5980cc AMG V12 engine developed by Mercedes-AMG: the peak output of 450 kW/612 hp is continuously available between 4800 and 5100 rpm, while the electronically limited maximum torque of 1000 Nm (738 lb-ft) is on tap between 2000 and 4000 rpm. At just 1000 rpm the AMG V12 biturbo engine already delivers a torque of 570 Nm (420 lb-ft) to the crankshaft, and 750 Nm (553 lb-ft) at 1500 rpm.Fulminating and effortless acceleration at the highest speeds is just as much a strength of the AMG twelve-cylinder as cruising along serenely in a high gear. Both the instant responsiveness and almost vibration-free, refined running impress in equal measure, guaranteeing the long-distance comfort typical of a Mercedes. Opening the bonnet reveals a technical masterpiece: the engine cover of deep-drawn aluminium and carbon-fibre reinforced plastic (CRP) is a visual delight.Twelve-cylinder biturbo engine with know-how from motor sports During the concept and design phases of the V12 engine the AMG engineers made full use of the know-how gained from their many years of motor racing tradition. The AMG V12 engine features a finely balanced crankshaft of higher-strength material, forged pistons made from a special, extremely temperature and pressure-resistant material, a highly efficient oil-spray cooling system with a separate nozzle for each piston, and larger piston bolts. The main and connecting rod bearings are also made from a higher-grade material to compensate
temperature and pressure peaks more efficiently.
The charge cycle in the cylinder heads benefits from optimised combustion chambers and the longer opening times of the intake camshafts. A modified oil pump ensures a reliable supply to all lubrication points, even under the highest loads. An engine oil cooler is integrated into the AMG front apron, and an additional cooler is located in the wheel arch.
Particularly efficient intercooler
The AMG V12 biturbo engine is intercooled by a large low-temperature cooler located in the front end. The system operates on the particularly efficient principle of an air-water heat exchanger, and effectively cools the intake air compressed by the turbocharger before it enters the combustion chambers. Under full load, the larger surface of the low-temperature cooler achieves a 25 percent lower intake air temperature and ensures a high output and torque yield in all ambient temperatures and operating conditions. The compressor, turbine housing and turbine wheel of both turbochargers are larger in size, while the maximum charge pressure is 1.5 bar/22 psi.
The electronically controlled, AMG-specific fuel injection system operates at a variable system pressure of 3.6 to 5.0 bar (52 to 73 psi). The fuel pressure is variably and instantly adjusted depending on the performance requirement and ambient temperature. The engine electronics execute commands from the accelerator pedal within milliseconds, leading to outstanding responsiveness under all load conditions.
AMG sports exhaust system for typical AMG twelve-cylinder vocals
The typical AMG twelve-cylinder sound of the SL 65 AMG is provided by the AMG sports exhaust system with two oval, chromed twin tailpipes in a V12 design. The tri-metallic coating used in the catalytic converters results in a faster response from a cold start, more efficient emission control as well as superior long-term durability. Naturally the SL 65 AMG also fulfils all standard exhaust emissions limits such as EU 4. The engine is also able to take specific requirements of the U.S. market, such as LEV-II, On-Board Diagnosis II and oxygen sensor diagnosis, in its stride.The exceptional status of the AMG V12 engine was also recognised in the “International Engine of the Year Awards 2004”: in the “Best Performance Engine” category, the jury voted the 450 kW/612 hp AMG engine the winner ahead of 70 competing units from Europe, the USA and Japan. In the AMG engine workshops, each engine is traditionally hand-assembled according to the “One man, one engine” philosophy. This means that a single technician assembles the complete V12 engine by hand according to the most stringent quality standards – as witness his signature on the engine’s AMG badge.
AMG SPEEDSHIFT and asymmetrical locking differential
Power transfer in the SL 65 AMG is by the AMG SPEEDSHIFT five-speed automatic transmission with three drive modes. Pressing the “S/C/M” button in the centre console enables the driver to choose between the different transmission characteristics provided by “Sport”, “Comfort” and “Manual” modes. At any time the gears can also be shifted using the silver-coloured aluminium AMG shift paddles on the AMG ergonomic sports steering wheel.To cope with the engine’s enormous output and torque potential, the drive train features particularly robust and efficient components: not only a number of transmission components such as the clutch discs and the shift/torque converter lockup logic, but also the drive shafts, wheel location, wheel bearings and rear axle spring links are designed for extremely high strength.The reinforced rear axle differential housing accommodates a mechanical, asymmetrical multiple-disc locking differential with a locking factor of 30 percent under load; especially with a very sporty style of driving, this provides optimal rear wheel traction. In conjunction with the appropriately configured acceleration skid control, which has a feature known as traction logic, this means that the engine power is transferred to the road with best possible efficiency.