Piston Ring, Engine

Piston ring end gap-compression (top, in gauge) 0.17-0.33 mm
Piston ring end gap-compression (bottom, in gauge) 0.3-0.55 mm
Piston ring end gap-oil ring (steel rail, in gauge) 0.15-0.65 mm (0.006-0.026 inch)
Piston ring groove width-compression (top) 1.535-1.52 mm (0.0603-0.0598 inch)
Piston ring groove width-compression (bottom)
Piston ring groove width-oil 3.05-3.03 mm (0.12001-0.11929 inch)
Piston ring width-compression (top and bottom) 1.460-1.490 mm (0.05748-0.05866 inch)
Piston ring width-oil ring Side seal, snug fit
Piston ring-to-groove clearance-1st ring 0.030-0.065 mm (0.0012-0.00315 inch)
Piston ring-to-groove clearance-2nd ring 0.030-0.070 mm (0.0012-0.0028 inch)