N52B30 Car Engine Overhaul Rebuild Kit Pistons Rings Connecting Con Rod Bearings Set For E87 E90 E92 E60 130i 330i 530i This engine overhaul rebuild kit is designed for compatibility with E87, E90, E92, and E60 models equipped with the N52B30 engine.It supports engine rebuilding efforts by offering a complete set of internal components engineered to restore performance and efficiency. The kit features a compression ratio of 9.3:1, contributing to improved power output and engine responsiveness.It includes pistons, piston rings, connecting rods, and rod bearings—each designed to meet precise specifications for fitment and function. Pistons are constructed with materials and include ring dimensions of 1.2mm for the first ring, 1.5mm for the second ring, and 2.0mm for the third ring, supporting consistent sealing and reduced oil consumption.Connecting rods are built to maintain structural integrity under operating stress, while rod bearings are shaped to minimize friction and support smooth crankshaft rotation. This rebuild kit is suitable for use in engine overhauls performed by both experienced DIY users and professional mechanics.The components are designed for direct replacement, simplifying the reassembly process during full engine builds. Disclaimer: This aftermarket part is not affiliated with the manufacturer.Mentioned brands/models are for compatibility identification only.