How many pistons do I need to order for my engine?

This piston is sold individually. You will need to order one piston for each cylinder in your BMW M50B25 engine. The M50B25 is typically a 6-cylinder engine, so you would order six pistons.

What does '+0.50 Oversized' mean for this piston?

The '+0.50 Oversized' designation means this piston is larger than the standard bore size. Your engine's cylinders will need to be precisely machined (bored and honed) to 84.50mm to properly fit this piston. This is a common practice when rebuilding an engine or when replacing worn cylinders.

What is the advantage of a forged piston over a cast piston for a turbo build?

Forged pistons are made by shaping aluminum under extreme pressure, which creates a denser grain structure. This makes them significantly stronger and more resistant to deformation and failure under the high heat and pressure of a turbocharged engine compared to cast pistons.

Wiseco Forged Piston M50B25 Turbo 84.50MM +0.50 8.8:1 ASC-01

Name: Wiseco BMW M50B25 2.5L 24V Turbo 84.50MM Bore +0.50 Oversized 8.8:1 - Single Piston
Brand: Wiseco
SKU: wiseco-wiseco-bmw-m50b25-2-5l-24v-turbo-84-50mm-bore-0-50-oversized-8-8-1-single-t14-189560
Price: 219.40 USD
Availability: BackOrder

Wiseco BMW M50B25 2.5L 24V Turbo 84.50MM Bore +0.50 Oversized 8.8:1 - Single Piston

$219.40

On Backorder

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

Wiseco forged piston for BMW M50B25 2.5L 24V turbo engines. 84.50MM bore, +0.50 oversized, 8.8:1 compression.

Key Features

Fits BMW M50B25 2.5L 24V turbo engines.
Forged aluminum construction for increased strength and durability.
84.50mm bore size, +0.50mm oversized for a specific machined cylinder dimension.
8.8:1 compression ratio, suitable for turbocharged applications.
Sold individually, order one per cylinder.

This piston is designed for BMW M50B25 2.5L 24V turbo engines. It is +0.50mm oversized and requires cylinders to be machined to 84.50mm bore size. Not CARB approved; cannot ship to California.

Secure CheckoutFast Shipping631-982-0042

Product Details

If you're building a boosted M50B25 engine for your BMW, a strong set of pistons is crucial. This Wiseco piston is forged from high-strength aluminum, making it well-suited for the increased cylinder pressures and temperatures that come with turbocharging. It's designed to be 84.50mm in bore size and is +0.50mm oversized, meaning it's intended for a cylinder bore that's been machined to that specific dimension. The 8.8:1 compression ratio is a popular choice for turbo builds, offering a good balance between power and detonation resistance under boost.

Wiseco is known for making solid engine components, and these pistons are no exception. The forging process creates a denser, stronger grain structure compared to cast pistons, which is essential for handling the demands of forced induction. This piston is sold individually, so you'll need to order one for each cylinder in your M50B25 engine. Remember that when re-boring your cylinders to the +0.50mm size, it's important to use precise machining techniques to ensure a proper fit and seal.