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 suitable for high-performance engine applications.

What is the compression ratio of this piston set?

This piston set is designed to achieve a 12.3:1 compression ratio. This is a notable increase over stock and is intended for performance-oriented engine builds.

Are these pistons compatible with all S85 engines?

These pistons are specifically designed for the BMW S85 5.0L engine. It is always recommended to verify fitment with your specific engine code and consult the manufacturer's documentation for precise compatibility details.

Mahle MS Piston Set S85 B50 92.50mm Bore 197859642

Name: Mahle MS Piston Set BMW S85 B50 92.50mm Bore 75.2mm Stroke 140.7mm Rod 21mm Pin 12.2cc 12.3CR Set 10
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s85-b50-92-50mm-bore-75-2mm-stroke-140-7mm-rod-21m-t14-353445
Price: 1782.71 USD
Availability: BackOrder

Mahle MS Piston Set BMW S85 B50 92.50mm Bore 75.2mm Stroke 140.7mm Rod 21mm Pin 12.2cc 12.3CR Set 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 5.0L engines. 92.50mm bore, 12.3:1 CR. Part# 197859642. Not CARB approved.

Key Features

This set includes forged pistons for the BMW S85 5.0L engine.
Features a 92.50mm bore size.
Designed with a 12.3:1 compression ratio.
Constructed from 4032 aluminum alloy for strength and thermal stability.
Each piston uses a 21mm pin and is compatible with a 140.7mm connecting rod.
The dish volume is 12.2cc.

⚠️ 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 Mahle MS Piston Set includes everything you need to rebuild the heart of your BMW S85 5.0L engine. You get a complete set of forged pistons, designed to meet the specific demands of this high-performance V10. These pistons feature a 92.50mm bore and are engineered with a 12.3:1 compression ratio, which is crucial for maximizing power and efficiency in the S85 powerplant.

Mahle has utilized 4032 aluminum alloy for these pistons, a material known for its strength and thermal expansion properties, making it well-suited for demanding engine builds. Each piston measures 27.3mm from the center of the pin to the top of the crown, has a 75.2mm stroke, and uses a 140.7mm connecting rod with a 21mm pin. The 12.2cc dish volume contributes to the overall compression ratio. At 372g each, these pistons offer a well-balanced weight for consistent engine operation.

When rebuilding an S85 engine, using high-quality, precisely manufactured components like these Mahle pistons is essential for reliability and performance. It's important to note that this set is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.