Supertech Mazda Miata 1.8L 84mm Bore -4cc Dish 8.6:1 Pistons - Set of 4 (Excl Rings)

If you're rebuilding the engine in your Mazda Miata and looking to upgrade the internals, these Supertech forged pistons are a solid choice for your 1.8L engine. This set is designed for an 84mm bore and features a -4cc dish, which helps achieve a compression ratio of 8.6:1. This is a common target for boosted applications where a slightly lower compression ratio is beneficial for managing detonation and allowing for more aggressive tuning.

These pistons are forged from high-strength aluminum, a material chosen for its excellent strength-to-weight ratio. This means they can handle the increased cylinder pressures and temperatures associated with performance modifications, especially forced induction, without adding excessive rotational mass to your engine. The 84mm bore size is a common upgrade for the 1.8L Miata engine, often used when rebuilding or modifying the block. It's important to note that this set includes the pistons only; piston rings are sold separately and will need to be purchased to complete the installation.

When installing these pistons, ensure you follow the manufacturer's recommended clearances and lubrication procedures. Proper installation is key to achieving the longevity and performance these components are capable of. Remember, these pistons are not CARB approved and cannot be shipped to California. Always consult your engine builder or a trusted mechanic to ensure these pistons are the right fit for your specific build goals and vehicle.