What is the compression ratio with these pistons?

These Mahle MS pistons feature a -29cc dish volume. When installed in a BMW S54 3.2L engine with the stock stroke and rod length, this configuration results in a 9.0:1 compression ratio.

Are these pistons suitable for a stock engine rebuild?

Yes, these forged pistons are a strong option for rebuilding or upgrading your S54 engine. The 2618 aluminum alloy offers improved strength and durability compared to stock cast pistons, making them well-suited for high-performance applications.

What does the 'Not CARB approved' note mean?

This means the part does not meet California Air Resources Board (CARB) emissions standards. As a result, it cannot be legally shipped to or installed on a vehicle registered in California.

Mahle S54B Piston Set 87.50mm Bore 9.0 CR 930000045

Name: Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -29cc 9.0 CR Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s54b-87-50mm-bore-91-0mm-stroke-139mm-rod-21mm-pin-t14-191468
Price: 1085.79 USD
Availability: BackOrder

Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -29cc 9.0 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 BMW S54B 87.50mm Bore 9.0 CR Set of 6. Forged pistons for improved engine performance.

Key Features

Set of 6 Mahle MS forged pistons for BMW S54 engines.
Pistons measure 87.50mm bore diameter.
Designed for a 91.0mm stroke and 139mm connecting rod length.
Features a 21mm wrist pin diameter.
Piston dish volume is -29cc, resulting in a 9.0:1 compression ratio.
Constructed from strong 2618 aluminum alloy for durability.

This piston set is designed for the BMW S54 3.2L engine. Please verify compatibility 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

Forged from 2618 aluminum, this Mahle MS piston set is built for the demanding requirements of the BMW S54 engine. Each piston measures 87.50mm in bore diameter, with a 91.0mm stroke and a 139mm rod length. The 21mm wrist pin is a common size for performance applications, ensuring compatibility with many aftermarket connecting rods. These pistons feature a -29cc dish volume, which, combined with the engine's specifications, results in a 9.0:1 compression ratio. This is a solid choice for rebuilding or upgrading your S54 engine, offering improved strength and durability over cast pistons.

At 334 grams each, these pistons are well-balanced for high-RPM operation. The 2618 aluminum alloy is known for its excellent strength and resistance to thermal expansion, making it ideal for high-performance engines where heat and pressure are significant factors. This set includes all six pistons needed for a complete engine rebuild. Please note that this part is not CARB approved and cannot be shipped to California. It also carries a Prop 65 warning.