Supertech Toyota FRS/Subaru BRZ 86mm 32.5mm CH -15.5cc Crown 9.5:1 CR Piston - Set of 4 (Excl Rings)

If you're rebuilding the engine in your Toyota FRS or Subaru BRZ and looking for a solid set of pistons to handle increased performance, these Supertech forged pistons are a strong option. Designed for an 86mm bore, they feature a -15.5cc crown volume that results in a 9.5:1 compression ratio when installed in a stock bore engine. This compression ratio is a popular choice for naturally aspirated builds or those running moderate boost, offering an improved powerband without being overly sensitive to fuel quality.

These pistons are forged from high-strength aluminum, a process that makes them significantly more durable and resistant to detonation than cast pistons. This makes them well-suited for engines that see regular track use or are modified for higher output. The 32.5mm compression height is specific to the FRS/BRZ engine, ensuring proper piston-to-valve clearance and deck height when paired with the correct connecting rods. Remember that this set includes four pistons but does not include piston rings, which will need to be purchased separately.

When installing these pistons, it's crucial to follow the manufacturer's recommended clearances and lubrication procedures. Proper balancing of the rotating assembly is also highly recommended to ensure smooth operation and longevity. These pistons are a key component for anyone looking to build a reliable and powerful engine for their FRS or BRZ.