Which part of piston is the largest wear?

Usually the largest wear part of piston is piston ring groove.

Because the pressure of the gas increases the unit pressure of the piston ring on the ring groove.Due to the high-speed reciprocating motion of the piston, the impact of the piston ring on the ring groove is great.

In addition, the high temperature of the combustion gas causes the working temperature of the piston head to be high, and the closer to the top of the piston, the higher the temperature and gas pressure.?So the wear of the first ring groove is the most serious, and the wear of the following ring grooves is gradually reduced.