Favourable sealing performance of the piston ring pack is an important condition for the engine to maintain efficient, stable operation. Analysis on blow-by in piston ring pack for an inline six cylinder diesel engine was carried out, through the establishment of sealing system theory model. The Matlab program was compiled for numerical calculation. The results of the study provide a basis for improving the air tightness of the piston ring pack, reducing air leakage, thereby improving the performance of internal combustion engine.
