BMW 2,8L M50 / M52 / M54 Stempler (84,5mm)

8,7:1 / 32.5 / 135mm Plejlstænger

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Tags BMW M50 BMW M52 BMW M54 Motor 8,7:1 84,50

Part no: 41102-845

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BMW 2,8L M50 / M52 / M52 Pistons

The BMW 2.8L M50 / M52B/ M54 pistons are developed for mild to high tuning, mainly for road or club race cars that want to develop their engine for high mileage and/or street use. Designed by ZRP engineers and manufactured in Germany from 4032 (T6) high-silicon, low-expansion alloy. This allows the engine builder to run a closer piston to bore clearance thus producing a better seal. This minimizes the slapping noise during cold start, common place among engines running forged pistons, providing a quite operation and low oil consumption.
We have chosen a Full round skirt design with bottom reinforcing band, with oversize and deeper valve pockets to allow high lift camshaft profiles to be used. They have Offset pins for quiet operation and the wrist pins are made from 9310 alloy. Other features include Anti-detonation grooves to protect the first rings, gas pressure accumulator groove for better ring seal and vibration relieve. Premium Japanese quality 1.00mm x 1.20mm x 2.80mm ring package included.

Product Features and Design

Anti-detonation grooves for long wear life and performance
Gas pressure accumulator groove in the 2nd ring land for longer wear life.
Horizontal slots in the pin bore designed to allow oil to enter between the wrist-pin and pin-bore area.
Precision CNC machined ring grooves
4032-T6 high-silicon / low-expansion alloy
Honed pin bores
Clip cuts on the edge of the Intake side
Full Round skirt design with bottom reinforcing band for High HP/Boost applications
Valve Pockets designed to allow over size valves and high lift camshafts
Pistons designed to optimize squish for longer engine life and increased horsepower potential

Optional coatings offered per request

Thermal barrier coating “Blast Off Bronze”
Moly Side-Skirt and Under-Crown coating “Stealth Black”

Additional information

Application: 2.8L M50 / M52 / M54
Bore Size: 84.00mm, 84.50mm, 85.00mm
Weight 334 Gram
Stroke 84.00mm
Comp Ratio 8.7:1
Oem Comp Ratio 10.2:1
Comp Height 32.50mm
Rod 135.00mm
Pin Diam. 22.00mm
Deck Clearence -1.30
Dome CCS -12.50, -13.20, -13.90
Ring Set 21-GNH8400, 21-GNH8450, 21-GNH8500
Wrist Pin Pn WP098