Excessive blow by on new rings indicates what problem?

Excessive blow by on new rings typically indicates potential ring seating problems. When piston rings are newly installed, they need time and proper conditions to seat correctly against the piston and cylinder wall. Blow by occurs when combustion gases escape past the rings into the crankcase due to inadequate sealing.

If the rings do not seat properly, which can be caused by factors such as improper installation, insufficient tension, or issues with the cylinder wall finish, the effectiveness of the seal is compromised leading to excessive blow by. This compromises engine efficiency and can lead to increased oil consumption and emissions. Correctly seated rings create a tight seal that controls combustion gas flow and maintains pressure within the combustion chamber, essential for optimal engine performance.

Understanding ring seating is crucial in engine building and maintenance. Properly addressing any ring seating issues is key to ensuring that the engine operates efficiently and reliably over time.