What is the compression ratio of these pistons?

These Wiseco pistons are designed with a 9.5:1 compression ratio. This is a popular choice for builds looking for improved performance without going too extreme, suitable for naturally aspirated or mild forced induction applications.

Are these pistons a direct replacement for stock M50B25 pistons?

No, these are custom pistons designed for performance builds and engine rebuilds. They feature a specific bore size and crown design that may require machine work and careful consideration of other engine components for proper fitment and function.

What does the '0-TDC' designation mean for these pistons?

The '0-TDC' refers to the piston crown's design and its position relative to the cylinder head's valves at Top Dead Center. This specification is important for ensuring adequate valve-to-piston clearance, especially in modified engines where valve lift or duration might be increased.

Wiseco BMW M50B25 Piston Set 84.50mm 9.5:1 CR 13158

Name: Wiseco BMW M50B25 84.50mm 9.5:1 CR 0-TDC - Set Of 6
Brand: Wiseco
SKU: wiseco-wiseco-bmw-m50b25-84-50mm-9-5-1-cr-0-tdc-set-of-6-t14-713495
Price: 1277.22 USD
Availability: InStock

Wiseco BMW M50B25 84.50mm 9.5:1 CR 0-TDC - Set Of 6

$1277.22

Only 4 left in stock

Wiseco BMW M50B25 84.50mm 9.5:1 CR 0-TDC - Set Of 6

Key Features

Set of 6 custom pistons for BMW M50B25 engines.
84.50mm bore size.
9.5:1 compression ratio.
Forged aluminum construction for strength and reduced weight.
0-TDC piston crown design for proper valve clearance.
Not CARB approved; cannot ship to California.

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Product Details

Wiseco is well-known for making strong internal engine components, and this set of custom pistons for the BMW M50B25 engine is no exception. If you're rebuilding the top end of your M50B25, these pistons are designed to handle the demands of a performance build. They feature a bore size of 84.50mm and a compression ratio of 9.5:1, which is a common target for naturally aspirated or mild forced induction setups, offering a good balance between power and reliability.

These pistons are forged from high-strength aluminum, a material chosen for its excellent strength-to-weight ratio. This means they are robust enough to withstand the increased pressures and temperatures of a performance engine while keeping reciprocating mass down, which can help with engine response. The 0-TDC (Top Dead Center) designation refers to the piston crown design, indicating its position relative to the valves at the top of the stroke, crucial for proper valve clearance in modified cylinder heads. This set includes six pistons, enough for a complete engine rebuild.

When undertaking an engine rebuild of this caliber, it's important to ensure all components are properly matched and installed according to manufacturer specifications. This piston set is intended for custom applications, so careful attention to machining, balancing, and assembly is key to achieving optimal performance and longevity. Please note that these pistons are not CARB approved and cannot be shipped to California.