Whereas in the past the trend was more towards naturally aspirated engines with high-rev concepts, in recent years there has been a shift towards downsizing – small engines with turbocharging. Increasingly stringent requirements in terms of fuel consumption and exhaust emissions make modern engine construction a challenge at all levels.
Lightweight construction, reduction of friction and low CO2 emissions have top priority. In order to achieve these requirements, the highest demands are placed on production. As a result, the already tight specifications regarding shape and position tolerances as well as surface qualities are usually narrowed down even further.
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