CP Pistons | Forged Performance Pistons
Where to buy CP Pistons in Australia: Chicane Australia lists CP forged pistons and ring sets online and ships Australia-wide from the NSW Central Coast. Sets are matched by engine code: Subaru EJ20/EJ205 and EJ257 (including an EJ257 stroker set) for the WRX and STI, the Honda K20C1 in the Civic Type R FK8 and FL5, the Audi 2.5T FSI (DAZA/DNWA) with a 23mm pin, and the 2.3L EcoBoost in the Focus RS and Mustang. There is also a CP ring set for EJ255/EJ257 engines in 100mm bore. Most CP items show a 3 - 5 Days lead time, while the EJ20 and EJ257 stroker sets show 5 - 7 Days.
CP forges its pistons from 2618-T6 alloy and finishes them on CNC machines, with X-Forging used to add strength while saving weight.
Shop by Vehicle
- CP Pistons for Subaru WRX & STI (EJ)
- Subaru: WRX (GC), WRX (GD), WRX STI (GD), WRX STI (GR), WRX STI (GV), WRX STI (VA)
- Honda: Civic Type R (FK8), Civic Type R (FL5)
- Audi 2.5T: RS3 (8V.5), RS3 (8Y), TT RS (8S)
- Ford 2.3L EcoBoost: Focus RS (LZ)
Shop by Product Type
- Forged piston sets: Subaru EJ20/EJ205, EJ257 and EJ257 stroker, Honda K20C1 (Civic Type R FK8/FL5), Audi DAZA/DNWA 2.5T FSI (23mm pin) and Ford 2.3L EcoBoost (Focus RS LZ, Mustang FM/FN).
- Ring sets: the CP ring set for EJ255/EJ257 engines in 100mm bore, supplied as a single-piston set.
See every brand's range in pistons.
Choosing the Right Part
CP pistons are selected against the specific engine, not just the car, so confirm these identifiers before ordering:
- Engine code: EJ20/EJ205, EJ255, EJ257, K20C1, DAZA/DNWA 2.5T FSI, and so on.
- Chassis code where relevant: for example FK8 or FL5 for Honda Civic Type R.
- Bore size: listed in the product title where applicable, such as 100mm for the EJ255/EJ257 ring set.
- Compression ratio and stroke: standard or stroker combinations change piston compression height.
- Wrist pin diameter and pin wall thickness: for example the 23mm pin option on the Audi 2.5T kit.
- Kit contents: check whether an item is a full set or supplied as a single piston or single-piston ring set.
CP X-Forging uses internal bracing and ribs to increase rigidity while reducing weight, and moves the pin bosses inward so shorter, stronger wrist pins can be used. Shelf pistons also benefit from profiled pin bore technology, which uses a trumpet-shaped bore to reduce stress compared with traditional honing. Anti-detonation (contact reduction) grooves help protect the top ring, while accumulator grooves help maintain ring seal under high boost.
Installation & What You'll Need
Fitting forged pistons is an engine-out, full-rebuild task. Installation by a professional engine builder is recommended.
- Machine shop measurement and honing to the correct piston-to-wall clearance for 2618 alloy.
- Correct ring end gap filing and ring fitment for your boost and fuel combination.
- Rod and pin fitment checks, including circlips and pin retention hardware.
- Balancing and deck clearance checks for stroker combinations.
- 2618 alloy requires larger cold-start clearances, so tuning and warm-up practice should be discussed with your builder.
FAQ
Where can I buy CP Pistons in Australia?
Chicane Australia sells CP forged pistons and ring sets and ships Australia-wide from the NSW Central Coast. Shop by vehicle above, search by CP part number, or contact our team with your engine code, bore size and build details.
Why are CP Pistons made from 2618 alloy?
2618-T6 aluminium is a low-silicon, high-expansion alloy designed for racing. Its ductility lets it bend rather than shatter under extreme loads or detonation, which suits high-boost engines such as the EJ257 and K20C1. It needs larger cold-start clearances in exchange for that strength.
What is X-Forging technology?
X-Forging uses internal bracing and ribs to increase structural rigidity while reducing weight. Moving the pin bosses inward allows shorter, stronger wrist pins to be used, lowering reciprocating mass without compromising the piston's ability to handle high cylinder pressures.
Is the EJ255/EJ257 ring set a full engine set?
No. The CP ring set for the EJ255/EJ257 in 100mm bore is supplied for a single piston, so order one per cylinder.
Need help choosing? Contact our team at sales@chicaneaustralia.com.au.
