Piston Ring, Engine

Piston Ring Compression:
Top Groove Side Clearance 0.05 - 0.027 mm (0.0019 - 0.0011 inch)
Second Groove Side Clearance 0.05 - 0.027 mm (0.0019 - 0.0011 inch)
Top Ring Gap 0.25 - 0.50 mm (0.010 - 0.020 inch)
Second Ring Gap 0.25 - 0.50 mm (0.010 - 0.020 inch)
Piston Ring Oil:
Groove Clearance 0.05 - 0.021 mm (0.0019 - 0.0082 inch)
Gap 0.25 - 1.27 mm (0.010 - 0.050 inch)