Piston Ring, Engine

Piston Ring
Ring closed gap
Top ring Standard 0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Second ring Standard 0.37 - 0.52 mm (0.0144 - 0.0203 inch)
Oil ring Standard 0.20 - 0.50 mm (0.0079 - 0.0197 inch)

Ring groove gap
Top ring Standard 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Second ring Standard 0.030 - 0.070 mm (0.0012 - 0.0028 inch)