Piston Kit for BMW N55B30 / N55B30A (Part No. 11257584125) — (Fits: BMW)
Piston kits specifically designed for the BMW N55B30 engine (3.0L inline-six) typically fall into the high-performance category. Manufactured using the ZL109 aluminum alloy casting process, their standard specifications typically feature a bore of 84.00mm or 84.50mm, a stroke of 89.6mm, and a compression ratio of 10.2:1. These kits are typically equipped with dish-type piston crowns—featuring a dish volume ranging from approximately -10.5 to -14.7cc—and are paired with reinforced piston pins, specifically engineered to withstand the demands of higher boost pressure conditions.
Description
Key Specifications (Typical Performance Kit)
Engine: BMW N55B30 3.0L Inline-6
Bore: 84.00 mm (Standard Size) or 84.50 mm (Oversize)
Stroke: 89.60 mm
Compression Ratio: 10.2:1 (Common specification for turbocharged engines) · Compression Height: 1.275 IN – 1.276 IN
Piston Material: ZL109 Cast Aluminum Alloy
Piston Type: Dish-top; Piston Volume (Dish): -10.50 CC to -14.70 CC
Piston Pin Diameter: 22 mm (Common specification)
