12-cylinder AMG biturbo engine, an output of 450 kW/612 hp and a maximum torque of 1000 Nm – the new SL 65 AMG is the world's most powerful and highest-torque series-produced roadster. The open-top two-seater not only maintains Mercedes-AMG's impressive V12 tradition; it also offers a level of per-formance previously unheard of in this engine size class: the SL 65 AMG acceler-ates from 0 to 100 km/h in 4.2 seconds and passes the 200 km/h mark after just 12.9 seconds; its top speed is 250 km/h (electronically governed).
With its modified AMG sports suspension, mechanical differential lock and newly developed AMG high-performance brake system with composite discs, front and rear, the ultra-powerful high-performance Roadster's dynamic handling is certainly impressive. And the exclusive standard equipment on-board this open-top dream car underlines the technological ambition behind it. The new AMG V12 flagship model extends the number of SL-Class engine versions to five. The market launch of the SL 65 AMG is scheduled for June 2004.
Much of the credit for the AMG 6.0-litre V12 engine's extraordinary performance must go to the biturbo system, which features larger turbochargers and powerful water-type charge-air cooling. The remarkable maximum torque of 1000 Nm remains constantly on tap between 2000 and 4000 rpm. The 570-Nm torque which the AMG V12 biturbo engine delivers to the crankshaft at just 1000 rpm rises to 830 Nm 500 rpm later.
The AMG 12-cylinder is as ideally suited to powerful acceleration in the highest engine speed range as it is to relaxed cruising in high gear. Superbly responsive, yet smooth and refined, it guarantees the high level of touring comfort traditionally associated with Mercedes. Exciting high-tech features are revealed as soon as the bonnet is opened. The redesigned engine cover, which is made from deep-drawn aluminium and carbon-fibre reinforced plastic (CFRP) is a visual treat.
The 12-cylinder engine is assembled by hand at the AMG engine facility – right next to the line where the supercharged AMG V8 for the Mercedes-Benz SLR McLaren is produced. The "one man, one engine" philosophy is reflected by the characteristic signature plate on the AMG V12 which bears the name of the specialist who assembled the engine and guarantees the highest standards of quality and workmanship.
AMG SPEEDSHIFT with steering-wheel controls and asymmetric differential lock
In the SL 65 AMG power is transmitted by the AMG SPEEDSHIFT 5-speed automatic transmission with steering-wheel gearshift controls and manual mode. In keeping with the tremendous levels of power and torque available, a number of measures have been taken to optimise key transmission components – including the adoption of newly developed clutch pack discs and modified shift and torque-converter-lockup logic. There are also special drive shafts, larger hub carriers and wheel bearings and special spring links at the rear axle.
In the reinforced rear axle differential case, fitted with a heat sink, is a mechanical, asymmetric, multiple-disc limited-slip differential with a lock factor of 40 percent under load. This ensures good traction, particularly with a very sporty driving style. With the modified acceleration skid control system, which is equipped with traction logic, the high engine output can always be optimally transmitted to the road.
Text and photos courtesy of DaimlerChrysler AG
