Do piston rings rotate around their grooves during operation?

Piston rings do not rotate around their grooves during engine operation. Instead, they remain in a fixed position within their respective grooves on the piston. The design and function of piston rings are critical for maintaining a proper seal between the piston and the cylinder wall, which prevents combustion gases from escaping and controls oil consumption.

In their fixed position, these rings expand and contract in response to changes in temperature and pressure, ensuring they maintain contact with the cylinder wall. This is crucial for efficient engine performance. The rings' design typically includes features such as a slight gap that allows for thermal expansion and helps with maintaining the proper sealing mechanism.

Although there can be some lateral movement due to engine vibrations or forces acting on the piston assembly, this does not constitute rotation around their grooves. Therefore, the assertion that piston rings rotate is incorrect.