Mubea engine valve springs are wire springs made from cold-formed high-tensile spring steel. This automotive application requires springs capable of withstanding extremely high loads in addition to today's rigid quality requirements. Minimum force tolerances, highest fatigue stress characteristics and extremely good relaxation behaviour are required to ensure optimised valve train design and long engine service lifetimes.

For the new generation of engines, Mubea can offer designs capable of further reductions in required spring forces and valve spring heights by utilising special designs (including, cylindrical, conical, beehive springs made out of round or profiled wire). Mubea's application of boundary layer modification technology (MRM) uses the high tensile strength of CrSiV/CrSiNiV steels in order to achieve positive residual stresses. This process has significantly increased bearable loads to a point where it has been possible to reduce costs, as intensive piece hardening processes are often no longer necessary.

Mubea has also supported the development of electro-mechanical valve trains and produces actuator springs that meet the stringent accuracy and loads required for these applications. Much of this work is in tight co-operation with FEV Motorentechnik.

The main factors in Mubea's success are high material quality, leading manufacturing technology and total process quality assurance. In addition to a world-wide presence, Mubea have many years of development experience, which along with state-of-the-art testing, rapid prototyping and fully automated plant, leave Mubea in a robust position to support global engine programmes. With more than 1 billion valve springs supplied since 1996 we have achieved a leading position in all key markets.