Piston Ring, Engine

Piston ring
End gap
Top 0.15 - 0.30 mm (0.0006 - 0.0012 inch)
Intermediate 0.25 - 0.50 mm (0.0098 - 0.0197 inch)
Oil control 0.15 - 0.65 mm (0.0059 - 0.0256 inch)
Groove width
Top 1.53 - 1.55 mm (0.0602 - 0.0610 inch)
Intermediate 1.52 - 1.54 mm (0.0598 - 0.0606 inch)
Oil control 3.030 - 3.050 mm (0.1193 - 0.1201 inch)
Ring width
Top and intermediate 1.47 - 1.50 mm (0.0579 - 0.0591 inch)
Ring-to-groove clearance
Top 0.03 - 0.08 mm (0.0012 - 0.0032 inch)
Intermediate 0.02 - 0.07 mm (0.0007 - 0.0028 inch)