A Concise History of Thermoplastic Sealing Engine Cover Systems

The technology to manufacture thermoplastic rocker covers has evolved significantly since early applications in the US launched in 1980. New sealing methods and the widespread use of aluminum in cylinder heads make it easier to take advantage of the cost, weight and part integration opportunities that thermoplastics and the injection molding process have to offer.

By understanding these developments, a functional, lightweight, low-cost, full-featured cover can be designed and manufactured.