Technician A says that some piston rings have chamfers or reliefs cut into them to cause them to twist. Technician B says that chrome rings should not be used in out-of-round cylinders. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct that some piston rings have chamfers or reliefs cut into them to cause them to twist. This twist helps the ring seat better against the cylinder wall, creating a better seal. 
Technician B is correct that chrome rings should not be used in out-of-round cylinders. Chrome rings require a perfectly round cylinder to function properly. If the cylinder is out-of-round, the chrome ring will not conform properly and will not create an effective seal.

Technician a Says That Some Piston Rings Have Chamfers or Reliefs