ZRP Forged Pistons for BMW 2.8L M50 / M52 / M54 84.50mm 8.7:1

BMW 2.8L M50 / M52B / M54 pistons are developed for moderate to high level builds, primarily for street or club race cars that wish to develop their engine for high mileage and/or street use. Designed by ZRP engineers and manufactured in Germany from high-silicon, low-expansion 4032 (T6) alloy. This enables the engine builder to use a smaller piston-to-bore clearance, resulting in a better seal. This minimizes cold-start piston slap noise, common in engines using forged pistons, providing quiet operation and low oil consumption. We have chosen a full round skirt design with an underside reinforcing band, with oversized and deeper valve pockets to allow for the use of high lift camshaft profiles. They have offset pins for quiet operation and the piston pins are made from 9310 alloy. Other features include anti-detonation grooves to protect the top rings, gas pressure accumulator groove for better ring sealing, and vibration relief. Premium Japanese 1.00mm x 1.20mm x 2.80mm ring pack included. Product Features and Design Anti-detonation grooves for increased lifespan and performance Gas pressure accumulator groove on the second ring land for increased lifespan. Horizontal grooves in the pin bore designed to allow oil to get between the piston pin and pin bore area. CNC machined ring grooves High silicon/low expansion 4032-T6 alloy Pin bores polished Clip cut-outs on the intake side edge Full round skirt design with underside reinforcing band for high HP/Boost applications Valve pockets designed to allow for oversized valves and high lift camshafts Pistons designed to optimize compression for increased engine longevity and higher horsepower potential Optional coatings offered on request "Blast Off Bronze" Thermal Barrier coating Molybdenum side skirt and under crown "Stealth Black" coating