Piston Ring, Engine

Piston Ring
Ring closed gap
Top ring Standard 0.23-0.28 mm (0.0091-0.0110 in.)
Second ring Standard 0.37-0.52 mm (0.015-0.0203 in.)
Oil ring Standard 0.20-0.50 mm (0.0079-0.0197 in.)
Ring groove gap
Top ring Standard 0.040-0.080 mm (0.0016-0.0031 in.)
Second ring Standard 0.030-0.070 mm (0.0012-0.0028 in.)