The influence of a piston ring assembly design on blowby and friction in a SI engine
by Jeong Eui Yun, Yooseok Chung
International Journal of Vehicle Design (IJVD), Vol. 17, No. 2, 1996

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.

Online publication date: Wed, 28-May-2014

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