What is the compression ratio with these pistons?

These Mahle MS pistons feature a -13.1cc dish volume, which results in a 11.5:1 compression ratio when used with the stock BMW S54 3.2L engine components.

What material are these pistons made from?

The pistons are forged from 2618 aluminum. This material is chosen for its strength, durability, and good thermal expansion properties, making it suitable for high-performance engine applications.

Are these pistons compatible with forced induction?

Yes, the forged 2618 aluminum construction and the 11.5:1 compression ratio make these pistons a strong option for both naturally aspirated and forced induction (turbocharged or supercharged) setups on the BMW S54 engine.

Mahle S54B Piston Set 87.00mm Bore 930286125

Name: Mahle MS Piston Set BMW S54B 87.00mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -13.1cc 11.5 CR Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s54b-87-00mm-bore-91-0mm-stroke-139mm-rod-21mm-pin-t14-432942
Price: 1085.79 USD
Availability: BackOrder

Mahle MS Piston Set BMW S54B 87.00mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -13.1cc 11.5 CR Set of 6

$1085.79

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle MS Piston Set for BMW S54B 3.2L engines. 87.00mm bore, 11.5:1 CR. Set of 6.

Key Features

Fits BMW S54 3.2L engines.
87.00mm bore diameter.
91.0mm stroke and 139mm connecting rod length.
Features a 21mm wrist pin and -13.1cc dish volume.
Achieves an 11.5:1 compression ratio.
Forged from 2618 aluminum for strength and durability.

This piston set is designed for the BMW S54 3.2L engine. Please verify fitment with your specific vehicle application.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

Mahle's MS Piston Set is built for the demanding BMW S54 3.2L engine. If you're rebuilding the top end of your S54, these pistons are a solid choice for performance and reliability. They're designed to handle the stresses of high-output naturally aspirated or forced induction applications, offering a significant upgrade over stock components.

Each piston in this set measures 87.00mm in bore diameter, with a 91.0mm stroke and a 139mm connecting rod length. They feature a 21mm wrist pin and a dish volume of -13.1cc, which helps achieve a compression ratio of 11.5:1. This specific compression ratio is well-suited for a wide range of tuning setups, providing a good balance of power and drivability. The pistons are forged from 2618 aluminum, a strong material known for its durability and resistance to expansion under heat, ensuring longevity even under aggressive use. Each piston weighs in at 337g, contributing to a balanced rotating assembly.

This set includes all six pistons needed for a complete engine rebuild. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.