What is the compression ratio achieved with these pistons?

These Mahle MS pistons are designed to achieve a 10.1:1 compression ratio when used with the appropriate cylinder head and gasket specifications for the BMW S85 B50 5.0L V10 engine.

What material are these pistons made from and why is it important?

The pistons are forged from 4032 aluminum alloy. This material is chosen for its excellent strength and resistance to thermal expansion, which is crucial for handling the high temperatures and stresses found in performance V10 engines.

Are these pistons compatible with all BMW S85 engines?

These pistons are specifically designed for the BMW S85 B50 5.0L V10 engine. It is important to verify that your specific engine model and build plan align with the specifications, such as bore size, compression height, and pin diameter, before installation.

Mahle S85 V10 Forged Piston Set 197859522

Name: Mahle MS Piston Set BMW S85 B50 5.0L V10 Forged Dome Piston - Set of 10
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s85-b50-5-0l-v10-forged-dome-piston-set-of-10-t14-353469
Price: 1782.71 USD
Availability: BackOrder

Mahle MS Piston Set BMW S85 B50 5.0L V10 Forged Dome Piston - Set of 10

$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 B50 5.0L V10 engines. Forged dome pistons, set of 10.

Key Features

Fits BMW S85 B50 5.0L V10 engines.
Forged from 4032 aluminum alloy for strength and thermal stability.
Dome piston design contributes to a 10.1:1 compression ratio.
92.00mm bore diameter with 27.3mm compression height.
Designed for use with a 75.2mm stroke and 140.7mm connecting rod.
Includes 21mm wrist pins and weighs 366 grams per piston.

This piston set is specifically designed for the BMW S85 B50 5.0L V10 engine. Not CARB approved, cannot ship to California.

⚠️ 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 S85 B50 5.0L V10 engine found in performance BMWs. If you're rebuilding the heart of your V10, these forged pistons are a solid choice for durability and performance. They feature a dome design that contributes to the engine's compression ratio, specifically targeting a 10.1:1 compression with the specified components.

These pistons are forged from 4032 aluminum alloy, a material known for its strength and resistance to thermal expansion, making it well-suited for high-performance applications where temperatures can get intense. Each piston measures 92.00mm in bore diameter with a 27.3mm compression height, designed to work with a 75.2mm stroke and a 140.7mm connecting rod. The pin diameter is 21mm, and each piston weighs in at 366 grams. The dome volume is 2.1cc, which is a key factor in achieving that 10.1:1 compression ratio when paired with the correct cylinder head and gasket combination.

This set includes ten 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. Always refer to the manufacturer's detailed installation instructions and specifications to ensure proper fitment and performance when rebuilding your S85 engine.