Piston Ring, Engine

Piston ring
Ring closed gap
Top ring Standard 0.20 - 0.35 mm (0.0079 - 0.0138 in)
Second ring Standard 0.37 - 0.52 mm (0.0146 - 0.0205 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)