Manley 94-01 Acura Integra GSR (B18C1) 81.5mm +.5mm Oversize Bore 12.5:1 Dome Piston Set with Rings

If you're rebuilding the engine in your 1994-2001 Acura Integra GSR, especially if you're aiming for more power or a complete overhaul, a set of high-performance pistons like these from Manley is a critical component. These pistons are designed to replace your stock ones, increasing the bore size to 81.5mm, which is 0.5mm larger than the original specification. They also feature a 12.5:1 compression ratio dome, which will raise your engine's compression for a noticeable boost in power and throttle response when paired with appropriate tuning.

Manley uses their signature 2618 alloy forgings for these pistons, a material known for its strength and ability to handle the stresses of a performance engine. The pistons come with tool steel wrist pins and have proven cam and barrel skirt profiles. These profiles are shaped to help the piston move smoothly within the cylinder walls, reducing wear while still allowing the piston to generate substantial power. The ring lands and grooves are machined to strict standards, which is key for ensuring a good seal between the piston and cylinder wall, leading to better compression and more efficient combustion.

This set includes everything you need to get your engine rebuilt with these upgraded pistons, including the rings. Manley's manufacturing process ensures that the ring groove squareness to the skirt is precise, which is important for long-term reliability. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For optimal performance, it's recommended to consult with a professional engine builder or tuner to ensure your engine management system is properly adjusted for the increased compression ratio.