Background
Having decided that its venerable 190e small entry-level saloon would make a fantastic platform for a purpose-built race car - thanks to its low-drag bodywork, sophisticated rear suspension setup and other cutting-edge mechanical features - Mercedes-Benz set about producing a road-going homologation version of the ‘hot’ 190, initially to allow the 190 to compete in rallying, and later in road-going competition use after Audi’s Quattro system rendered it obsolete before it even saw the dirt.
Under the bonnet, M-B decided to enlist legendary performance house Cosworth to tune and develop its four-cylinder engine, with the resulting 2.3-litre 16-valve lump boasting a new head, dual overhead camshafts and other supporting modifications, resulting in a power output of 183bhp, enabling Mercedes to go toe-to-toe with its competitors in Group A touring car championships.
In 1988, the 2.3-litre engine was bored-out to 2.5 litres, and double-row timing chains were employed to rectify the snapping issue that had become prominent on early single-row 2.3-litre engines. The peak figures of the engine was also increased as a result of these modifications, with power output now sitting at 200bhp, along with a nominal torque increase.
In competition use, the 190E Cosworth performed well, scoring two wins during its first year racing, second-place in the championship and then went on to further success, with a then-unknown Ayrton Senna also spending time behind the wheel of a 190 Cosworth during the inaugural 1984 Nurburgring race of champions.















