Benefits: Two-step Variable Valve Actuation

environmental icon

Improves engine out NOx emissions

to help OEMs meet 2027/2029 regulations

fuel gas pump icon

Reduces fuel consumption

warm temperature thermometer

Keeps aftertreatment system hot

during low load operation to lower emissions

More performance benefits
  • 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
  • Faster warm up of engine and aftertreatment system
  • Developed with over 60 years of engine brake and integrated valvetrain experience
  • Provides the benefits of a fully-flexible VVA system with a less complex, lower cost system
  • Higher engine braking power due to increased compression ratio

Flexible Solutions

  • Compatible with other valvetrain technologies such as cylinder deactivation and engine braking
  • Available for multiple valvetrain and fuel types including diesel, natural gas and hydrogen
  • Applicable to all engine displacements, including large engines

A full suite of 2-Step VVA technologies is available. Download our brochure to learn more about the technologies and their unique benefits.

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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