Supertech Mazda Miata 1.8L 83.5mm Bore -4cc Dish 8.6:1 CR Pistons - Set of 4 (Excl Rings)

What you get in this package is a set of four Supertech forged pistons, each measuring 83.5mm in bore diameter and featuring a -4cc dish. These pistons are specifically made for the Mazda Miata 1.8L engine and are designed to achieve a compression ratio of 8.6:1. It's important to note that this set does not include piston rings, which will need to be purchased separately.

Forged pistons like these are a significant upgrade over cast pistons, especially if you're planning on pushing your Miata's engine harder, perhaps with forced induction or higher performance tuning. The forging process creates a much stronger and more durable piston structure, capable of handling increased cylinder pressures and temperatures. The -4cc dish is a specific design feature that helps achieve the 8.6:1 compression ratio when paired with the correct cylinder head and gasket combination, making it suitable for builds aiming for a slightly lower compression, often beneficial for turbo or supercharged applications to prevent detonation. The 83.5mm bore size is a common overbore for the 1.8L Miata engine, allowing for increased displacement and potentially more power.

When rebuilding or upgrading your Miata's engine, choosing the right pistons is crucial for reliability and performance. These Supertech pistons are a well-built option for enthusiasts looking to build a robust 1.8L engine. Remember to consult your engine builder or a trusted mechanic for the correct piston ring set and installation procedures, as proper ring gap and installation are critical for engine longevity and performance. Please be aware that these pistons are not CARB approved and cannot be shipped to California.