What material are these pistons made from?

These pistons are forged from 2618 aluminum. This material is chosen for its strength and durability, making it suitable for high-performance engine builds.

What is the compression ratio of these pistons?

These pistons contribute to a 12.5:1 compression ratio. This is achieved through their -9.2cc dish volume and are designed to work with the S54 engine's stroke and rod length.

Can these pistons be shipped to California?

No, this piston set is not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle S54B Forged Piston Set 87.50mm Bore 12.5 CR 930000145-

Name: Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin +9cc 12.5 CR - Single
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s54b-87-50mm-bore-91-0mm-stroke-139mm-rod-21mm-pin-t14-756894
Price: 171.42 USD
Availability: BackOrder

Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin +9cc 12.5 CR - Single

$171.42

On Backorder

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

Mahle forged piston set for BMW S54 3.2L engines. Features 87.50mm bore and 12.5 CR for improved performance.

Key Features

Fits BMW S54 3.2L engines.
Forged from 2618 aluminum for strength and durability.
87.50mm bore size.
12.5:1 compression ratio with a -9.2cc dish volume.
Includes a 21mm wrist pin.
Designed for a 91.0mm stroke and 139mm rod length.

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

Mahle is well-known for making solid engine components, and this forged piston set for the BMW S54 3.2L engine is no exception. If you're rebuilding the top end of your S54, these pistons are built to handle the demands of a performance engine. They feature a specific bore size of 87.50mm, a 91.0mm stroke, and a 139mm rod length, all designed to work together for optimal engine function.

These pistons are forged from 2618 aluminum, a strong material often used in high-performance applications because of its durability under stress. They come with a 21mm pin and have a dish volume of -9.2cc, which contributes to a 12.5:1 compression ratio. This higher compression ratio can lead to improved throttle response and more power when paired with appropriate tuning. Each piston weighs in at 357g, keeping rotating mass manageable for the engine.

Please note that this piston set is not CARB approved and cannot be shipped to California. It is sold as a single piston, so be sure to order the correct quantity for your engine build.