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Webinar: Piston Ring Conformability

Wednesday, January 30, 2013

12:00 PM - 01:30 PM

Join us for this webinar addressing piston ring conformability, given by Val Dunaevsky, VVD Engineering.

Piston Ring Conformability

Presenter: Val Dunaevsky, VVD Engineering

Where: STLE University, live webinar event broadcast to your computer

When: Thursday, January 31, 2013 at 12-1:00 p.m., with optional Q&A from 1-1:30 p.m.

Cost: $39 for members, $59 for non-members


The piston ring is one of the most tribologically intensive and functionally important parts of the reciprocating engines and compressors. Piston rings account for 50-60 % of friction loss between the piston and bore. The three main functions of piston rings in reciprocating engines/compressors are: Sealing the working chamber from the crankcase; Supporting heat transfer from the piston to the cylinder wall, and Regulating oil consumption. Piston rings are also being used increasingly as seals for rotating shafts in some rotary compressors and transmissions, for example.

There are a number of system parameters that affect performance of the piston rings. These include piston design, cylinder bore geometry, lubricants, and cylinder bore finish, operating speed, rings design and other.

The purpose of the seminar is to focus predominantly on the issue of conformability of the piston rings, which is defined by rings’ design and cylinder bore distortions. The conformability is one of the major mechanisms affecting piston rings’ performance.

By attending the webinar, one will be able to learn about the factors influencing the rings conformability and how to estimate conformability.


Dr. Valery (“Val”) Dunaevsky is a recognized expert in surface metrology, tribology and contact mechanics. He is the acclaimed author of many technical papers and patents. He is a leading face in the field of piston rings mechanics. Dr. Dunaevsky is the author of the 2D conformability analysis of piston rings that has been utilized by many motor builders. He was the first one who understood the necessity of a 3D conformability analysis. Piston rings conformability is one of the major factors affecting oil consumption and cylinder kit efficiency. Under Dunaevsky leadership the advanced conformability methodology is being developed.

Contact Us

Phone: (847) 825-5536

Email: Kara Sniegowski at klemar@stle.org

Reminder: Computer speakers or headphones are needed to hear the audio. 

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