Supertech Mazda Miata 1.8L 83.5mm Bore 2.5cc Dome 9.5:1 CR Pistons - Set of 4 (Excl Rings)

If you're rebuilding the engine in your Mazda Miata and looking to improve its performance, a set of forged pistons like these from Supertech is a solid choice. These pistons are designed for the 1.8L engine and feature an 83.5mm bore with a 2.5cc dome, resulting in a 9.5:1 compression ratio. This setup is a popular option for those seeking a balance between power and reliability for street or track use.

Forged pistons are made from a solid block of aluminum that's heated and hammered into shape, making them significantly stronger and more durable than cast pistons. This strength is crucial for handling the increased pressures and temperatures found in a performance-oriented engine build. The 9.5:1 compression ratio is a good middle ground, offering improved throttle response and power over stock without being overly aggressive for pump gas, though it's always wise to consult with your engine builder regarding fuel requirements and tuning. This set includes four pistons, but remember that piston rings are sold separately, so you'll need to source those to complete the installation.

When installing these pistons, it's important to ensure your engine block is properly machined to the correct bore size and that all clearances are set according to manufacturer specifications. Proper balancing of the rotating assembly is also key for a smooth-running and long-lasting engine. These pistons are a critical component for anyone serious about getting the most out of their Miata's 1.8L engine.