Supertech Nissan CA18DET 83.5mm (+0.5) 30mm CH Flat Top 8.5:1 CR Piston - Set of 4 (Excl Rings)

If you're rebuilding the engine in your Nissan CA18DET, getting the right pistons is crucial for performance and reliability. This set from Supertech is designed for engines bored out to 83.5mm, which is a 0.5mm oversize from the factory specification. These pistons feature a flat top design and are intended to achieve a compression ratio of 8.5:1, making them a solid choice for many performance builds where a balance between power and drivability is desired.

These pistons are forged, meaning they start as a solid block of aluminum that's heated and hammered into shape under immense pressure. This process creates a much stronger and more durable piston than cast aluminum, which is important for handling the increased stresses found in a performance or rebuilt engine. The 30mm wrist pin bore is a standard size for many performance applications, and the flat top design helps maintain a specific compression ratio when paired with the correct cylinder head and gasket combination. Remember that this set includes four pistons but does not include piston rings, so you'll need to source those separately.

When installing these pistons, ensure your cylinder bores are properly honed to match the piston size and that you follow the manufacturer's recommended clearances. Proper installation is key to ensuring these pistons perform as expected and last for many miles. It's also important to note that these pistons are not CARB approved and cannot be shipped to California.