Piston Ring, Engine

Piston ring
Ring closed gap
Top ring Standard 0.20 0.25 mm (0.0079 0.0098 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)