BLOOMFIELD, CT, USA – Jacobs Vehicle Systems®, the world’s leading manufacturer of heavy-duty diesel engine retarding systems and valve actuation mechanisms, has launched a new 2-Step Variable Valve Actuation (VVA) system. By enhancing performance and efficiency across an engine’s operating range, 2-Step VVA will help engine manufacturers further improve fuel consumption and reduce tailpipe emissions, as well as deliver a range of other benefits.