Piston Ring, Engine

Compression Rings
Side Clearance:
Top Groove 0.05-0.027 mm (0.0019-0.0027 inch)
Second Groove 0.05-0.027 mm (0.0019-0.0027 inch)
Ring Gap:
Top 0.25-0.50 mm (0.010-0.020 inch)
Second 0.25-0.50 mm (0.010-0.020 inch)

Oil Ring
Groove Clearance 0.05-0.021 mm (0.0019-0.0082 inch)
Gap 0.25-0.76 mm (0.010-0.040 inch)