Supertech Mazda 1.8L 85.5mm Bore -3.5cc Dome 9:1 CR Pistons - Set of 4 (Use SWM31071-2/Excl Rings)

If you're rebuilding the engine in your Mazda 1.8L and looking for a solid set of pistons to handle more power or just refresh your internals, this set from Supertech is a strong contender. These are forged pistons, which means they're built from a solid block of aluminum that's heated and hammered into shape. This process makes them significantly stronger and more durable than cast pistons, so they can better withstand the higher pressures and temperatures found in performance applications or when you're pushing your engine hard.

This particular set is designed for an 85.5mm bore and features a -3.5cc dome, resulting in a 9:1 compression ratio. This compression ratio is a good balance for many modified 1.8L Mazda engines, offering a noticeable bump in performance without being so high that it requires exotic fuel or extensive tuning. The forged construction also means they're lighter than many cast alternatives, which can help reduce reciprocating mass for improved engine response. Remember, these pistons do not include rings, so you'll need to source those separately, typically a set like the SWM31071-2 is recommended.

When you're putting in new pistons, it's a good time to inspect your cylinder walls for wear and ensure your connecting rods are straight and balanced. Since these are a performance-oriented part, it's always a good idea to consult with your engine builder or a trusted mechanic to confirm they're the right fit for your specific build goals and that you have the necessary supporting modifications for optimal performance and reliability.