Mercedes-Benz M102 engine

The M102 was a family of inline-four gasoline engines built by Mercedes-Benz from 1980 until 1995. It was the first of a new generation of modular engines that replaced the M115 and was a clean sheet design, with a thin-walled cast iron block that saved 30 to 40 kilograms, a cylinder bank offset by 15 degrees and a hemispherical cross-fire combustion chamber. It was the first four-cylinder engine of the company to use multi-point fuel injection, and its four-valve DOHC heads, originally developed by Cosworth for racing, powered the 190E 2.3-16 and 2.5-16 performance models. The in-house M111 replaced it in 1992 to 1993, although the commercial W461 G-Wagen and the TN van kept the single-cam M102 until the mid-1990s.