2-Step Variable Valve Actuation

Our 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. 

Performance benefits of Jacobs 2-Step VVA
  • Helps OEMs meet the upcoming 2027/2029 NOx emissions regulations and Greenhouse Gases (GHG) (CO2) reduction 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
JVS's 2-Step Variable Valve Actuation Technology
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.

Active Decompression Technology (ADT)
LIVC Testing

Watch Jacobs 2-Step VVA aux rocker for LIVC testing. 

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Let's talk about your program

Our engineers are always available to discuss your current or future technology challenges. Contact us using this form, and a member of our team will contact you within two business days.

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