CP Pistons EJ257 WRX STI (Stroker)
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CP Pistons for EJ257 WRX STI (Stroker) Engines
Available in:
For engines with 83mm stroke crank.
- Bore: 99.5mm (STD) / Comp: 8.5:1 - Part#: SC7433
- Bore: 99.75mm (+0.25mm) / Comp: 8.5:1 - Part#: SC7434
- Bore: 100mm (+0.5mm) / Comp: 8.5:1 - Part#: SC7435
- Bore: 100.5mm (+1mm) / Comp: 8.5:1 - Part#: SC746
- Bore: 99.5mm (STD) / Comp: 9.0:1 - Part#: SC7437
- Bore: 99.75mm (+0.25mm) / Comp: 9.0:1 - Part#: SC7438
- Bore: 100mm (+0.5mm) / Comp: 9.0:1 - Part#: SC7439
- Bore: 100.5mm (+1mm) / Comp: 9.0:1 - Part#: SC7440
- Bore: 99.5mm (STD) / Comp: 10.0:1 - Part#: SC7441
- Bore: 99.75mm (+0.25mm) / Comp: 10.0:1 - Part#: SC7442
- Bore: 100mm (+0.5mm) / Comp: 10.0:1 - Part#: SC7443
- Bore: 100.5mm (+1mm) / Comp: 10.0:1 - Part#: SC7444
STD bore size pistons are not recommended in a used bore for any performance engine unless the bores have done minimal work with minimal wear and the correct piston to bore clearance can be adhered to.
All piston manufacturers have a specific piston to bore clearance that they recommend. If STD bore pistons are requested and there is a piston to bore clearance issue we will not exchange or refund, due to the reasons given above.
| Product Name | CP Pistons EJ257 WRX STI (Stroker) |
|---|---|
| Brands | CP Carrillo |
| Engine | EJ257 WRX STI |
| Make | Subaru |
Delivery & Freight
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended bore clearance for the CP pistons in the EJ257?
The recommended piston to bore clearance varies depending on the specific piston and application. It's crucial to follow CP Carrillo's specifications for each piston size to ensure proper fitment and performance. Always consult the manufacturer's guidelines for clearance recommendations.
Can I use STD bore size pistons in a worn engine block?
STD bore size pistons are not recommended for use in a worn engine block. They should only be used if the bores have minimal wear and can maintain the correct piston to bore clearance. If there are clearance issues, we do not offer exchanges or refunds.
What compression ratio options are available for the CP pistons for the EJ257?
The CP pistons for the EJ257 are available in three compression ratios: 8.5:1, 9.0:1, and 10.0:1. Choose the compression ratio based on your specific performance goals and tuning setup.
Do these pistons come with locks, and what should I use?
These CP pistons are supplied without locks. You should use the factory locks from your existing setup to ensure proper retention and performance.
What is the maximum bore size available for these pistons?
The maximum bore size available for the CP pistons for the EJ257 is 100.5mm. Ensure that your engine block can accommodate this size and that proper machining is performed for optimal performance.
