Power Cylinder Blow-by: Blow-by Mechanisms J2797_202202

DOI: https://doi.org/10.4271/J2797_202202

Issuing Committee: Piston and Ring Standards Committee

Publisher: SAE International

Pages: 34

Rationale: This Five-Year Review and update include additional detail and clarifications on fundamental mechanisms of blow-by. Some of the updates are: Addition of Breathers that can affect blow-by. Removal of Oil Jets, Piston Pins, and Connecting Rods causing high blow-by Addition of Concentricity of the piston features that can cause blow-by Removed piston guidance and the associated figures as a cause of blow-by Removed Skirt Axial Profile and the associated figures as a cause of blow-by Added Microwelding as a factor that can cause high blow-by Updated the information regarding piston ring conformability Removed the effects of Oil Viscosity causing blow-by Removed Torque procedure and Improper O-rings affecting blow-by Added “Other Publications” in Section 2 with references to key technical publications on ring conformability