CP Piston & Ring Set for Honda B-Series - Bore (85mm) - Size (+1.0mm) - Compression Ratio (12.5)

If you're rebuilding the heart of your 1988-2000 Honda Civic or 1994-1997 Acura Integra, especially for a performance build, a set of high-performance pistons like these from CP Pistons is a critical component. These are forged pistons, meaning they start as a solid block of aluminum alloy that's heated and hammered into shape under immense pressure. This process creates a much stronger and more durable piston than cast pistons, which are poured into a mold. This strength is essential for handling the increased cylinder pressures and temperatures common in modified B-series engines.

This particular set is designed for an 85mm bore, which is a +1.0mm oversize from the stock dimension. This allows for a clean-up hone of the cylinder walls if they've become worn or slightly out of round, ensuring a perfect seal. With a 12.5:1 compression ratio, these pistons are intended to raise the compression of your B-series engine. This higher compression generally leads to more power and improved throttle response, especially when paired with other engine modifications like a performance camshaft or upgraded intake and exhaust systems. The set includes the pistons and the necessary rings to complete the installation.

When installing these pistons, it's important to follow the manufacturer's recommended clearances and lubrication procedures. Because these are an oversize piston, a proper cylinder bore and hone are required to ensure they fit correctly and seal well. This set is not CARB approved and cannot be shipped to California. Always consult your engine builder or a trusted mechanic for specific installation details and recommendations for your build.