Supertech Nissan KA24 89.5mm Bore -27cc Dish 8.6:1 CR Pistons - Set of 4 (Excl Rings)

Supertech is known for making well-built engine components, and these forged pistons for the Nissan KA24 engine are a prime example. If you're rebuilding the heart of your KA24-powered Nissan, these pistons are designed to handle increased stress and performance demands. They feature a 89.5mm bore and a -27cc dish, which helps achieve a compression ratio of 8.6:1. This specific compression ratio is often chosen for naturally aspirated builds aiming for a good balance of power and reliability, or for forced induction setups where a lower compression is needed to prevent detonation.

These pistons are forged from high-strength aluminum alloy, a common practice for performance engine builds because forging creates a denser, stronger grain structure compared to cast pistons. This makes them more resistant to the extreme pressures and temperatures found in performance engines. The -27cc dish is a notable feature, indicating a specific volume removed from the piston crown. This dish volume, combined with the combustion chamber volume of your cylinder head and the piston's compression height, determines the final compression ratio. For the KA24, this 8.6:1 CR is a popular choice for those looking to improve performance without sacrificing too much daily drivability or requiring extremely high-octane fuel.

This set includes four pistons, but remember that piston rings are sold separately. It's crucial to select the correct ring set that matches the bore size and piston groove dimensions for proper sealing and engine health. Given the price point and the nature of forged components, these pistons are intended for engine builds where performance and durability are key considerations. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially when dealing with critical engine components like pistons.