Mercedes-Benz M102 engine

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The M102 family is a inline-four gasoline automobile engine family built by Mercedes-Benz from 1980 until 1995. It was the first of a new generation of modular engines that replaced the M115, a derivative of the M121 engine in production since 1955. It would be complemented by the derived OM601 diesel engine in 1983 and the M103 six cylinder petrol and OM602 and OM603 five and six cylinder diesel engines in 1985. This family of motors was a clean sheet design featuring thin walled cast iron cylinder block facilitating 30-40 kg reduction in weight, as compared to the predecessor. The 15 degree offset of the cylinder bank allowed for better engine balancing and more compact placing. The cylinder head featured a hemispherical cross-fire combustion chamber. The M102 was the first 4 cylinder engine to feature multi-point fuel injection, and they would systematically replace the carburetor models towards the end of production. Later models added hydraulically adjusted valve lash and catalytic...

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