Piston Ring, Engine

Top Groove Side Clearance 0.05-0.085 mm (0.002-0.0035 inches)
Second Groove Side Clearance 0.05-0.09 mm (0.002-0.0035 inches)
Gap [1] 0.25-1.27 mm (0.0098-0.05 inches)
Side Clearance
Top Groove 0.05-0.085 mm (0.002-0.0033 inches)
Second Groove 0.05-0.09 mm (0.002-0.0035 inches)
Ring Gap
Top 0.15-0.36 mm (0.006-0.014 inches)
Second 0.5-0.71 mm (0.0197-0.0280 inches)

[1] With segment at 89.0 mm