Title: The influence of a piston ring assembly design on blowby and friction in a SI engine

Authors: Jeong Eui Yun, Yooseok Chung

Addresses: Automotive Technology laboratory, Institute for Advanced Engineering, Yongin P.O. Box 25, Kyonggi-do, 449-800, South Korea. ' Daewoo Motor Co. Ltd., Chongchon-dong 199, Bupyung-ku, Inchon, South Korea

Abstract: Small pressure transducer and signal transmit systems were developed, and applied to measure the inter-ring gas pressure in a four-stroke SI engine running at a full load condition. Inter-ring gas pressure was measured to tune in the orifice discharge coefficients for the concurrent simulation study. Discharge coefficient of top ring was observed to be significantly lower than that of other rings. Measurement of cylinder pressure and blowby were also made simultaneously. Simulations were performed under the starved lubrication condition using a commercially available RINGPAK program adjusted with the experimental results to investigate the influence of piston ring assembly design variables on blowby and friction.

Keywords: blowby; friction; inter-ring gas pressure; orifice discharge coefficient; pressure transducers; piston ring assembly; assembly design; SI engines; spark iginition; simulation; vehicle design.

DOI: 10.1504/IJVD.1996.061984

International Journal of Vehicle Design, 1996 Vol.17 No.2, pp.147 - 162

Published online: 28 May 2014 *

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