Background
With Mercedes having acquired a controlling interest in uber-tuners AMG in 1999, they were now determined to fully deploy those acquired, rarefied skills across their full model range. AMG might have been subsumed into the mothership, but the Stuttgart marque was canny enough to leave them as a distinct and autonomous sub-brand who hired their own engineers and maintained their own specialist plant in Affalterbach, Baden-Württemberg.
Inevitably enough, this attention would extend to the CLK-Klass GT coupe and convertible based on the W202 C-Klass saloon. The CLK first appeared in 1997 in C208 (coupe) and A208 (convertible) form. A facelift happened along in 1999 with the factory coding morphing into C209 and A209. For the exalted AMG fettled model, a single Affalterbach engine savant would be allocated to the hand building of each engine. AMG started with the 5-litre M113, 90-degree V8 engine and stroked it to 5.4-litres. A forged steel crankshaft, forged, weight-matched connecting rods and pistons were all fitted. A lightweight, AMG-specific chain-driven single overhead camshaft per bank featured, with two intake and one exhaust valves per cylinder, as well as 8 coil packs and 16 spark plugs in this twin-spark unit. This endowed the CLK 55 AMG with around 340 bhp and 376 Ib-ft of torque.
AMG expended much attention on other aspects of the CLK 55, of course. The five-speed automatic transmission was a fully adaptive unit, electronically controlled and with reinforced internals over those of lesser models. The uprated driveshaft, measuring four inches in diameter, routes into a reinforced rear differential to better handle the extra power. AMG also fitted higher-rated springs, restricted shock valves, larger diameter anti-roll bars and stiffer bushings. Brake discs were thicker and vented concluding the usual impressively holistic Affalterbach upgrade.
In Mercedes-Benz terms the CLK 55 AMG Convertible was built in modest numbers. For the first year the A209 was built by long-standing coachworks Karmann of Osnabruck and would represent the last car built by them prior to the company shutting it doors for the final time after 103 years.








