Piston Ring, Engine

Piston top ring end gap mm (inch) 0.200 - 0.450 mm (0.008 - 0.018 inch)
Piston bottom ring end gap mm (inch) 0.450 - 0.700 mm (0.018 - 0.028 inch)
Piston top ring groove width mm (inch) 1.64 - 1.66 mm (0.0645 - 0.0654 inch)
Piston bottom ring groove width mm (inch) 1.79 - 1.81 mm (0.0705 - 0.0713 inch)
Piston oil ring groove width mm (inch) 3.5 - 3.53 mm (0.1378 - 0.1399 inch)
Piston top ring width mm (inch) 1.578 - 1.598 mm (0.062 - 0.063 inch)
Piston bottom ring width mm (inch) 1.728 - 1.74 mm (0.068 - 0.069 inch)
Piston top ring-to-groove clearance mm (inch) 0.050 - 0.082 mm (0.002 - 0.0003 inch)
Piston bottom ring-to-groove clearance mm (inch) 0.050 - 0.082 mm (0.002 - 0.0003 inch)