2-Step Variable Valve Actuation

Jacobs Two-Step Variable Valve Actuation (VVA) system is for OEMs challenged with meeting future transient emissions and fuel economy targets at a lower overall system cost. 

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JVS's 2-Step Variable Valve Actuation Technology

Performance benefits of Jacobs® 2-Step VVA

  • Helps OEMs meet the upcoming 2027/2029 NOx emissions regulations
  • Reduces fuel consumption
  • Optimizes compression ratio vs load
  • Improves transient response when compared to Fixed Miller
  • Improves emissions by keeping the aftertreatment system hot during low load operation
  • Reduces engine-out NOx emissions
  • Developed with over 60 years of engine brake and integrated valvetrain experience
  • Available for multiple valvetrain and fuel types including diesel, natural gas, and hydrogen
  • Applicable to all engine displacements, including large engines
  • Provides the benefits of a fully-flexible VVA system with a less complex, lower cost system
  • Compatible with Jacobs® CDA and engine brake
  • Higher engine braking power due to increased compression ratio
2-step VVA performance graph

How Jacobs 2-Step VVA works

Using Jacobs proven mechanisms, a variable lift valvetrain provides the means to meet exhaust thermal management, engine performance, and emissions needs with minimal changes to the base engine, with the goal of reducing the size and cost of the aftertreatment system leading to reduced overall system costs.

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Download this information package for more details and technical information about Jacobs’ 2-Step Variable Valve Actuation.