What is the advantage of forged pistons over cast pistons?

Forged pistons are made by shaping metal under extreme pressure, which creates a denser, stronger grain structure. This makes them significantly more resistant to cracking and deformation under high stress, such as from increased compression or boost, compared to cast pistons.

Does this piston set include rings, wrist pins, and clips?

Typically, piston sets like this are sold without rings, wrist pins, and clips. These critical components are usually purchased separately to ensure you have the correct specifications for your build.

Can this piston set be shipped to California?

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

Wiseco Subaru FA20 86mm 10.5:1 CR Piston Set K684M86

Name: Wiseco Subaru FA20 86mm 10.5:1 CR 9.5cc Piston Set
Brand: Wiseco
SKU: wiseco-wiseco-subaru-fa20-86mm-10-5-1-cr-9-5cc-piston-set-t14-875071
Price: 695.54 USD
Availability: BackOrder

Wiseco Subaru FA20 86mm 10.5:1 CR 9.5cc Piston Set

$695.54

On Backorder

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

Wiseco Subaru FA20 86mm 10.5:1 CR 9.5cc Piston Set

Key Features

Fits Subaru FA20 engines.
86mm bore size.
10.5:1 compression ratio.
9.5cc dish volume.
Forged construction for improved strength and durability.
Not CARB approved; cannot ship to California.

This piston set is designed for Subaru FA20 engines. Please verify compatibility with your specific vehicle application.

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Product Details

If you're rebuilding the engine in your Subaru FA20-powered vehicle and looking for a solid upgrade, this Wiseco piston set is a popular choice. These pistons are designed to replace your factory ones, offering a robust build for enhanced performance and durability. They feature an 86mm bore and a 10.5:1 compression ratio, which is a common target for naturally aspirated builds or those running moderate boost, aiming for a good balance between power and drivability without excessive cylinder pressures.

Wiseco is well-known for its forged pistons, and this set is no different. Forging is a process that shapes metal under extreme pressure, creating a denser, stronger grain structure than cast pistons. This makes them much more resistant to the stresses of higher compression or boost, reducing the risk of cracking or deformation. The 9.5cc dish volume is specific to achieving that 10.5:1 compression ratio with the stock cylinder head volume, ensuring a predictable outcome for your build. These pistons are built to handle the demands of a performance engine, whether you're building a track car or a spirited daily driver.

When installing these pistons, remember they are a critical component of your engine's rotating assembly. Proper balancing of the rotating assembly, including these pistons, connecting rods, and crankshaft, is essential for smooth operation and longevity. Ensure you have the correct piston rings, wrist pins, and clips, as these are typically sold separately and are crucial for proper sealing and function. Always refer to the manufacturer's installation instructions for precise clearances and assembly procedures.