Blow by gases from combustion chamber to crankcase. A dynamic analysis of parameters affecting the phenomenon

Internal Combustion Engines (ICEs) are the generators of energy for many transportation applications. Apart from the fact that they are low efficiency machines, they are also responsible for air pollution. The combustion chamber as a working volume, is affected by gas leakages toward the crankcase due to imperfect sealing of the rings. This escape is known as blow by and affect both efficiency and emissions. In this paper a short bibliographic review concerning the phenomenon is introduced. The equations that rule the ring dynamics, inter-ring pressures and mass flows are described and solved for a diesel engine using ©Ricardo RINGPAK Solver. Ring dynamics, ring gap, masses, static twist and engine speed are the analysed parameters. However, blow by gasses are affected from many other factors.