Abstract
In 2001, the new four-cylinder engine launched by BMW was the world’s first SI engine for cars to have a fully variable valve train, BMW Valvetronic. Compared to its predecessor, it achieved a consumption reduction of 12 % whilst its basic technology provided the pattern for all future BMW SI engines. Since the launch of Valvetronic, its technology has undergone continuous development so that it will continue to meet all the demands placed on it in future at the same time as offering further potential. Mass-producing a system such as Valvetronic has been and remains at least as demanding a challenge as was its development. BMW is the only engine manufacturer to have attempted this feat, and has already produced and sold more than 2.5 million engines with Valvetronic.
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References
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Unger, H., Schwarz, C., Schneider, J. et al. The Valvetronic. MTZ Worldw 69, 30–37 (2008). https://doi.org/10.1007/BF03227902
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DOI: https://doi.org/10.1007/BF03227902