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Variable Valvetrain System Technology

This combination of 27 papers covers a decade of technical information reviewing the wide-range of approaches to Variable Valve Actuation (VVA). Each approach has unique benefits and a range of applications. These papers present a balanced view of the progress and challenges associated with VVA technology.

Fuel economy and reduced emissions continue to be large factors in engine technology. Therefore the continued development of VVA will become necessary on virtually all gasoline engines, and must be adopted on diesel engines. The benefits achieved with the applications of this technology include: fuel economy, reduced emissions, improved power, performance, reliability and durability.

Topics include:

  • Engine Cycles with VVA
  • Cam Phasing Systems
  • Profile Switching and Lost Motion Systems
  • Cylinder Deactivation
  • Mechanical Variable Valvetrain Systems
  • Camless Valve Actuation


  • Published By: SAE International
    Pages: 328
    27 Papers   See List
    Binding: Softbound
    Product Code: PT-122
    Product Status: Available
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    Robert J Moran

    Originally from the United Kingdom, Robert Moran graduated from Loughborough University with a Degree in Mechanical Engineering in 1993. He started his engineering career at Perkins Engines working on the layout, design and analysis of cylinder heads and valve trains. In 1997 he moved to the United States working for Ricardo, where he worked on the layout design of several new cylinder heads, including technologies such as cam phasing and cylinder deactivation. In 1998 he joined AVL and since then has developed a detailed knowledge of various VVA systems, from mechanical WT systems to the design and test of “camless" systems utilizing hydraulic valve actuation. Robert has developed an SAE seminar on WA technology and has integrated the requirements of system design, thermodynamics, engine development and system optimization to give a balanced perspective of the latest developments in this ever-widening technical field.

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    Variable Valvetrain System Technology

    ISBN: 978-0-7680-1685-7
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    ARi SAE Foundation PRI SAE Institute - An affiliate of SAE International SAE Brasil SAE India SAE UK - A Section of SAE International A World In Motion