Furthermore, the Schaeffler plant in Hirschaid has manufactured 160 million roller tappets for the “HEMI” engine over 25 years of production. Schaeffler said the milestones reflected its continuous optimisation of components for high-performance, efficient internal combustion engines used in hybrid powertrains. The Schaeffler plant in Hirschaid has been manufacturing the roller tappet for the “HEMI” engine since 2001, covering the entire value chain. Following the resurgence of the V8 engine, Schaeffler has experienced increased customer demand, it says. Unlike conventional roller tappets, the HEMI roller tappet features a hydraulically actuated mechanical locking mechanism controlled by the engine management system.