CP Piston & Ring Set for Acura/Honda K24 w/K20A/A2/A3 - Bore (86mm) - Size (STD) - Compression Ratio 9.0:1 - SC7040-4

CP Pistons Forged Piston Set — Honda K20 86mm, 9.0:1 (SC7040-4)

A standard-bore forged set at 9.0:1, which is the compression ratio most boosted K20 builds land on — enough to keep the engine responsive off boost without fighting knock once the turbo lights.

Standard bore means a fresh hone rather than a bore job on a good block, which keeps machine work and cost down on a build that doesn't need the extra displacement.

CP pistons are compatible with oversized valves and high-lift camshafts, so a head that's been worked doesn't force a different piston. Forged construction with a valve relief design built for the K-series combustion chamber.

Sold as a complete set: 4 pistons, 4 wrist pins, 4 wrist pin locks, and 4 ring sets.

Fitment: 02-06 Acura RSX Type-S (K20A2),  blocks running a K20/K20A2/K20A3 head.

Verify your compression before ordering. 9.0:1 is calculated against a specific head gasket thickness and chamber volume — deck height and any head work move the final number.