Supertech Subaru WRX 92mm Bore -5cc Dish 8.3:1 CR Coated Pistons- Set of 4 (SWF20062-0/Excl Rings)

This set includes four Supertech forged pistons, each with a 92mm bore and a -5cc dish, designed to achieve an 8.3:1 compression ratio. These pistons are specifically made for Subaru WRX engines and come with a special coating on the piston skirts to help reduce friction and wear during operation. They are built from strong, lightweight aluminum alloy, which is crucial for handling the increased stresses in a performance engine. The dish design is important for controlling the combustion chamber volume and achieving the target compression ratio, which directly impacts engine power and efficiency.

Supertech is known for making well-built internal engine components, and these pistons are no exception. They are forged, meaning the aluminum is shaped under extreme pressure, creating a denser, stronger, and more durable piston than cast alternatives. This makes them suitable for engines that are pushed harder, whether for daily driving or more spirited use. The 8.3:1 compression ratio is a notable change from stock, typically indicating these are intended for use with forced induction setups where the turbocharger or supercharger will increase the effective compression. This lower static compression ratio helps prevent detonation when boost is applied.

It's important to note that this set does not include piston rings, so you will need to source those separately. Also, these pistons are not CARB approved and cannot be shipped to California. When rebuilding your engine, always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially regarding ring gap, piston-to-wall clearance, and torque specifications.