Piston Ring, Engine

Ring Gap
Compression Rings 0.254 - 0.508 mm (0.010 - 0.020 inch)
Oil Control (Steel Rails) 0.254 - 1.270 mm (0.010 - 0.050 inch)
Ring Side Clearance
Compression Rings 0.038 - 0.076 mm (0.0015 - 0.0030 inch)
Oil Control (Steel Rails) 0.06 - 0.21 mm (0.002 - 0.008 inch)
Ring Width
Compression Rings 1.971 - 1.989 mm (0.0776 - 0.0783 inch)
Oil Control (Steel Rails) 3.848 - 3.975 mm (0.1515 - 0.1565 inch)