11257537124 11257542292 8PCS Engine Piston Ring Kit For 550i 650i X5 E60 E61 E63 E65 E70 N62B48 4.8L Car Replacement Parts This 8-piece engine piston ring kit is designed for vehicles equipped with the N62B48 4.8L V8 engine.It includes eight pistons and rings, providing a complete solution for engine rebuilds or replacements.The cylinder bore measures Φ93.00mm, with wrist pin diameters of Φ21mm and lengths of 54mm.Ring thicknesses are set at 1.2mm for the first ring, 1.5mm for the second ring, and 2.4mm for the third ring, contributing to consistent engine performance and reduced risk of cylinder expansion.The design supports precise fitment in corresponding engine configurations, maintaining operational integrity.Suitable for use by professional mechanics and vehicle enthusiasts during engine servicing.Compatibility should be verified using the part number or vehicle identification details before installation.