Supertech Ford Zetec 85.5mm Bore -9cc Dish 8.7:1 CR Pistons - Set of 4 (Excl Rings)

This is a set of four Supertech forged pistons designed for Ford Zetec engines, featuring an 85.5mm bore and a -9cc dish that results in a compression ratio of 8.7:1. These pistons are built for performance applications where increased displacement and a specific compression ratio are desired. The forged construction offers a strong foundation for engines that will see demanding use, providing durability over cast alternatives.

Each piston in this set measures 85.5mm in bore diameter. The -9cc dish is a key feature, carefully calculated to achieve the 8.7:1 compression ratio when paired with the appropriate cylinder head and gasket combination. This compression ratio is often chosen for naturally aspirated builds aiming for a balance between power and pump gas compatibility, or for forced induction setups where a lower static compression is beneficial to manage boost pressure and prevent detonation. The pistons themselves are well-built from forged aluminum, a material known for its strength and ability to withstand higher cylinder pressures and temperatures compared to cast pistons.

This set includes the four pistons, but please note that piston rings are sold separately and will need to be acquired to complete the installation. Proper ring selection is crucial for sealing, oil control, and overall engine health. Ensure you select rings compatible with the 85.5mm bore and the specific groove dimensions of these Supertech pistons. Due to emissions regulations, this product cannot be shipped to California.