Wiseco BMW 2.5 12V M20B25 Dish 8.8:1 CR 85MM Bore Piston Shelf Stock Kit

If you're rebuilding the engine in your BMW with the M20B25 2.5L 12-valve engine, a solid set of pistons is crucial for reliable performance. This Wiseco shelf stock piston kit is built for that job, offering a dish-style piston designed to achieve an 8.8:1 compression ratio. This compression ratio is a good balance for many performance builds, allowing for increased power while still being manageable with pump gasoline in many setups.

Wiseco is well-known for its forged pistons, and this kit is no different. Forging is a manufacturing process that shapes metal under extreme pressure, resulting in a stronger, more durable piston than cast alternatives. This makes them ideal for engines that see regular use or are being built for higher performance applications. The 85mm bore size is specific to the M20B25 engine, ensuring a proper fit within the cylinder walls. These pistons are designed to fit right into your existing M20 block, simplifying the rebuild process.

This kit includes the pistons themselves, ready for your machine shop to hone the cylinders to the correct size. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's specifications and the manufacturer's installation instructions for proper assembly and break-in procedures.