Manley BMW N55/S55 37cc Platinum Series Dish Extreme Duty Piston Set - 84.5mm Bore

If you're rebuilding the engine in your BMW N55 or S55, a solid set of pistons is crucial for handling increased power and ensuring long-term reliability. This Manley Platinum Series piston set is built for those demanding applications, offering a significant upgrade over stock components. They feature a 37cc dish design and an 84.5mm bore, specifically tailored for these high-performance BMW engines.

These pistons are forged from a domestic 2618 alloy, a material known for its exceptional strength and ability to withstand high temperatures and pressures. Manley uses proven cam and barrel skirt profiles, which help reduce friction and wear on your cylinder walls while still allowing the engine to make substantial power. The ring lands and grooves are machined to very strict standards, which is key for achieving a good seal with your piston rings, leading to better compression and more power. They also come standard with tool steel wrist pins for added durability.

When you're putting together a high-performance engine, every component matters. Manley's unique manufacturing process allows them to machine the skirt and ring grooves in a single operation, ensuring the ring grooves are perfectly square to the piston skirt. This attention to detail contributes to the overall performance and longevity of your engine build. Keep in mind these pistons are not CARB approved and cannot be shipped to California.