Concentric camshafts have been in production for use on overhead valve engines, where they allow to vary valve overlap. But this technology also offers potential for emission reduction and improved fuel economy on modern overhead camshaft gasoline and diesel engines.
BorgWarner and ThyssenKrupp Presta commonly developed a whole family of so called Concentric-Cam systems, which consist of phaser technology of BorgWarner and assembled camshafts from ThyssenKrupp Presta. The functionality the system offers goes beyond what is available in the market today.
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