Piston Ring, Engine

Top Groove Side Clearance: 0.05-0.085 mm (0.002-0.0033 inches)
Second Groove Side Clearance: 0.05-0.09 mm (0.002-0.0035 inches)
Top Ring Gap: 0.15-0.36 mm (0.006-0.014 inches)
Second Ring Gap: 0.5-0.71 mm (0.0197-0.0280 inches)
Groove Clearance: 0.20 mm (0.008 inches)
Gap with segment at 89.0 mm: 0.25-1.27 mm (0.0098-0.05 inches)