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Mercedes-Benz M121 engine
The Mercedes-Benz M121 engine was a 1.9 liter single overhead camshaft inline four-cylinder engine introduced by Mercedes in 1955 and used in various model lines during the 1950s and 1960s. Originally rated at at 5500 RPM, it replaced the 1.8 liter M136 introduced in 1953, offering improved performance over the M136's lateral camshaft design.
Applications included mid-size sedans, such as the 190, the 190SL roadster, and trucks such as the Unimog and L319 models.
==History==
The M121 engine was developed just after the end of World War II. It was built in the Sindelfingen Works factory, which assembled the Mercedes Ponton Model series to which the engine belonged to.〔("Historical Perspective" ), ''Mercedes Benz Ponton'', Retrieved on 11-22-2010.〕 The M121 engine made its debut in 1955. It was the first generation of 4-cylinder engines from Mercedes Benz. The M121 replaced the less efficient M136 1.8 liter engine, a pre World War II engine that was introduced 2 years before in 1953. The M121 benefited from innovations and technology from Mercedes' larger engines such as the M186 3.0 liter and M180 2.2 liter engines. One of these innovations was a new single over head camshaft design which allowed for more power and efficiency. It was developed by a team led by Hans Scherenberg. Within this team, Karl-Heinz Goschel was one of the key engineers who developed the engine design.
The M121 series was in production until 1967, when the M115 series engine took its place.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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