The Return of the Twin-Turbo V8
The automotive landscape has seen a shift toward hybridization and forced-induction smaller-displacement engines, yet Mercedes-AMG is making a defiant statement with its latest release. The Mercedes-AMG CLE 646 Spezialanfertigung marks the return of the twin-turbo 4.0-litre V8 engine to the platform. This model serves as the second entry in the brand’s exclusive Mythos series, a collection of limited-run vehicles designed specifically for automotive collectors.
Despite the technical prowess packed into the vehicle, the production run is restricted to a mere 30 units globally, all of which are already accounted for. This rarity positions the car as a significant collector’s item rather than a mass-market performance vehicle, signaling that while AMG retains the engineering capability to produce high-displacement internal combustion engines, they are constrained by modern regulatory environments.
Engineering and Performance Specifications
At the heart of the CLE 646 sits the M177 Evo “hot-vee” motor. This engine configuration features a flat-plane crankshaft, which allows for improved throttle response and higher engine speeds compared to a traditional cross-plane layout. The output is a robust 646bhp, paired with 622lb ft of torque. Unlike many modern performance vehicles that rely on all-wheel-drive systems to maximize traction, this model funnels its power exclusively to the rear wheels.
The transmission is handled by a nine-speed MCT multi-clutch unit, integrated with an electronically controlled limited-slip differential. These components manage the power delivery to the rear axle, resulting in a 0-62mph acceleration time of 3.9 seconds. While this figure is impressive for a rear-wheel-drive machine, the car is engineered for track-focused dynamics rather than straight-line drag racing performance.
Weight Reduction and Chassis Enhancements
To optimize the handling characteristics of the CLE 646, Mercedes-AMG has implemented a rigorous weight-reduction program, stripping 170kg from the base model. This was achieved by removing rear seats, sound deadening, and various driver assistance systems, and replacing standard components with lightweight alternatives. The roof, bonnet, boot lid, and sills are crafted from carbon fibre to lower the center of gravity and improve structural rigidity.
The suspension setup is the result of a collaboration with KW, featuring four-way adjustable dampers that allow drivers to fine-tune the handling for specific track surfaces. Stopping power is provided by a high-performance ceramic brake system with 420mm front discs clamped by six-piston calipers. Despite these efforts, the vehicle remains heavy by sports car standards, with a curb weight of 1,895kg, which underscores its role as a grand-touring track machine rather than a lightweight racer like the Porsche 911 GT3.
Exterior Design and Aerodynamics
The visual presence of the CLE 646 is defined by a significant increase in track width. The vehicle is 52mm wider than the standard AMG CLE 53, creating an aggressive stance that accommodates massive 305/30 ZR20 front tires and 335-section rear tires. Every element of the bodywork has been modified to improve airflow and downforce.
The aerodynamic package includes an adjustable front splitter and a rear wing, both designed to manage high-speed stability. Carbon fibre is utilized extensively throughout the exterior, and the rear glass has been replaced with polycarbonate to further reduce weight at the highest point of the chassis. These modifications serve a dual purpose: they provide the mechanical cooling necessary for the high-output V8 and ensure that the vehicle remains planted during high-speed cornering.
The Concept of the Mythos Series
The Mythos series represents a strategic pivot for Mercedes-AMG. By limiting production to small batches, the manufacturer can bypass certain mass-production constraints, allowing for the inclusion of highly specialized engineering that might not be feasible for wider release. However, this strategy raises questions regarding the branding and future direction of AMG’s flagship performance models.
Many enthusiasts expected a successor to the legendary Black Series models, yet this vehicle carries the Spezialanfertigung label. The lack of traditional Black Series naming conventions suggests that Mercedes is positioning these vehicles as ultra-exclusive boutique products. As the automotive industry continues to navigate the transition toward lower emissions, the CLE 646 stands as a reminder of the performance capabilities of the internal combustion engine, even if its availability is reserved for a select few.
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