What material are these Mahle pistons made from?

These Mahle MS pistons are constructed from 4032 aluminum alloy. This material is chosen for its strength and favorable thermal expansion characteristics, making it well-suited for high-performance engine applications.

What is the compression ratio of this piston set?

This piston set features a 10.2:1 compression ratio. This is a common ratio for performance builds aiming for increased power output while maintaining reasonable drivability.

Are these pistons compatible with all S85 engines?

This set is designed for the BMW S85 5.0L V10 engine. While it's a direct fit for the intended application, it's always recommended to confirm specific fitment details with your engine builder or by checking your vehicle's specifications.

Mahle S85 Piston Set 92.5mm Bore 10.2 CR 197859542

Name: Mahle MS Piston Set BMW S85 B50 92.5mm Bore 75.2mm Stroke 140.mm Rod 21mm Pin 2.1cc 10.2CR Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s85-b50-92-5mm-bore-75-2mm-stroke-140-mm-rod-21mm--t14-353434
Price: 1782.71 USD
Availability: BackOrder

Mahle MS Piston Set BMW S85 B50 92.5mm Bore 75.2mm Stroke 140.mm Rod 21mm Pin 2.1cc 10.2CR Set of 6

$1782.71

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 S85 5.0L engines. Features 92.5mm bore and 10.2:1 compression ratio.

Key Features

Fits BMW S85 5.0L V10 engines.
Mahle MS Piston Set includes six pistons.
Features a 92.5mm bore size.
Compression ratio is 10.2:1.
Constructed from 4032 aluminum alloy.
Includes 21mm wrist pins.

This piston set is designed for the BMW S85 5.0L engine. Please verify compatibility with your specific vehicle model and year.

⚠️ 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

This is a Mahle MS Piston Set specifically for the BMW S85 5.0L V10 engine. If you're rebuilding or upgrading the heart of your M5 or M6, these pistons are built to handle the demands of that high-revving powerplant. They are designed with a 92.5mm bore and a 10.2:1 compression ratio, which is a common target for performance builds seeking improved power without sacrificing too much drivability.

Mahle uses 4032 aluminum for these pistons, a well-known material in performance engine building. This alloy offers a good balance of strength and thermal expansion properties, making it suitable for the high temperatures and pressures found in a performance V10. The pistons feature a 2.1cc dish volume and come with a 21mm wrist pin, designed to work with a 140.7mm connecting rod and a 75.2mm stroke. Each piston weighs in at 372 grams, contributing to a balanced rotating assembly. This set includes six pistons, enough for a complete engine rebuild.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. For optimal results, ensure your engine builder is aware of the specific requirements for installing these pistons, including proper ring gap, bearing clearances, and cylinder wall preparation. This set is a solid option for those looking to restore or enhance their S85 engine with reliable components.