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Refinement of Engine In-Cycle Losses of Parasitic and Errant Dynamic Nature

Home  Research Programme  Surface Tribology  Top Compression Ring  Cylinder Liner  Piston Skirt  Experiments   
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 About Encyclopaedic

EPSRC together with a combination of academic researchers, industrial partners and technology providers supported the Encyclopaedic Project to create a new range of products and predictive tools to reduce friction, enhance fuel efficiency, and refine NVH.


In this site you will find information about our research into piston-ring/liner interactions, including findings from experimentation and predictions from numerical models.


In car engines the compression ring conjunction accounts for 65% to 70% of piston cylinder parasitic losses. This is the most complex of engine tribological contacts on account of the ring bore conformability, ring dynamics (including twisting and fluttering) and global deformation represented by in-plane and out-of-plane modes.




"The top compression ring alone can account for up to 5% of the total engine losses" (Andersson 1991). For such a small conjunction this is a significant source of inefficiency.

The project brings together the collaboration of three universities with a vertical integrated consortium of industrial concerns. The aim is to reduce the piston parasitic and errant dynamic losses, thus improving engine efficiency. This is a multi-disciplinary research integrating dynamics, structural integrity, NVH, tribology, surface engineering and physical chemistry, thus a multi-physics, multi-scale approach. The partners include Loughborough University, Cranfield University, The University of Sheffield  and six industrial partners; Aston Martin Lagonda, Prodrive, BP Castrol, Capricorn, Es-Technology, and Ricardo Consulting Engineers.This is an EPSRC (Engineering and Physical Sciences Research Council)  funded programme grant.
 Click on the logos for a link to our partner's web-pages