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SC70457-4 is a complete four-piston forged set engineered specifically for the Honda/Acura K20A, K20A2, and K20A3 engine family. CP Pistons machines every unit at their Irvine, California facility from 2618 forged aluminum, a high-strength aerospace-grade alloy chosen for its resilience under thermal and mechanical load. At 87mm bore (+1.0mm over the stock 86mm K20 bore) and a 9.6:1 flat-top compression ratio, this set is designed for street performance, time attack, and mild-to-aggressive forced-induction builds where factory cast pistons are not an option.
Key Features
- Exact CP Pistons manufacturer part number SC70457-4
- Purpose-built forged piston set configuration
- Selection depends on engine family, bore, stroke, rod length and pin diameter, compression height, crown design, cylinder head, valve reliefs, ring pack, and exact build measurements
- Final machining, clearances, ring gap, compression, and included components remain exact-build and exact-part-number specific
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2002-2004 | Acura | RSX | Type-S |
| 2002-2006 | Acura | RSX | Base |
Specifications
| Manufacturer | CP Pistons |
|---|---|
| Manufacturer Part Number | SC70457-4 |
| Product Type | Piston Sets - Forged - 4cyl |
| Fitment Type | Vehicle specific, exact engine build verification required |
What's Included
- 4x Forged pistons (SC70457), 87mm bore, 9.6:1 flat top, 2618 aluminum
- 4x Ring sets (CPN-3425): 1.0mm top ring, 1.2mm second ring, 2.8mm oil ring, one set per piston
- 4x Wrist pins (866-2250-20CP1C), 22mm diameter, floating/forced style
- 4x Wrist pin locks (866x063 SWL)
- Pin fitting service: CP-Carrillo performs a final hone of the wrist pin bore to achieve proper clearance before shipment, included at no charge
About CP Pistons
CP Pistons develops forged pistons, piston rings, wrist pins, and related engine components for performance applications. Correct selection and assembly depend on the exact engine, dimensions, cylinder head, connecting rod, intended use, machine work, clearances, and manufacturer part number.
Related CP Pistons Products
- CP Piston & Ring Set Acura/Honda K24 w/ K20A/A2/A3 Bore (87.0mm)-Size (STD)-CR (10:0)-Set of 4
- CP Piston & Ring Set Acura/Honda K24 w/ K20A/A2/A3 Bore (87.5mm)-Size (+0.5mm)-CR (10:0)-Set of 4
- CP Piston & Ring Set for Acura/Honda K20A/A2/A3 - Bore (87.5mm) - Size (+1.5mm) - Compression Ratio
Browse the CP Pistons collection for related forged pistons, rings, pins, locks, and engine-building components.
Frequently Asked Questions
How do I confirm this CP piston set matches my engine build?
Confirm the exact engine family, bore size, stroke, connecting rod length and small-end diameter, cylinder head and valve layout, compression height, dome or dish volume, ring pack, wrist pin, and manufacturer part number.
Can the advertised compression ratio be used for every build?
No. Final compression depends on bore, stroke, deck height, gasket thickness and bore, combustion chamber volume, piston-to-deck position, and the exact piston crown volume.
What measurements are required before final piston assembly?
A qualified engine builder should verify bore finish and clearance, ring end gap, pin fit, deck clearance, piston-to-valve clearance, rod and counterweight clearance, and all CP installation specifications.
Installation Instructions
Professional engine machining and assembly are required. Follow the current CP Pistons and engine-builder instructions for this exact part number. Measure every bore and component, verify all clearances and ring gaps, clean all parts and oil passages, use the specified lubricants and fastener procedures, confirm rotating-assembly and piston-to-valve clearance, and complete the required break-in and calibration.
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