Forged Pistons for Subaru, EJ257 WRX STI (stroker), 100mm, 10:1 (CP Pistons SC7443)
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|
Make |
Subaru |
|
Model |
EJ257 WRX STI (stroker) |
|
Part Number |
SC7443 |
|
Cylinders |
4 |
|
Bore (in) |
3.937 |
|
Bore (mm) |
100 |
|
Size |
+0.5mm |
|
Stroke |
83 |
|
Conrod |
130.5 |
|
Comp Height (in) |
1.123 |
|
Comp Height (mm) |
28.5 |
|
Dom/Dish CC |
-8.4 |
|
Compression Ratio |
10 |
|
Weight (Grams) |
395 |
|
Pin (mm) |
23 |
|
Rings |
RS1658-3937-0 |
|
Ring Thickness |
1.2 x 1.2 x 2.0mm |
|
Pin included (Standard) |
905-2500-18CP1S |
|
Upgraded Pin |
905-2500-20CP3S |
|
Ultra Duty Pin |
905-2500-26CP3S |
|
Locks |
905x055 SUB |
CP pistons are compatible with oversized valves and high lift camshafts. CP Pistons represent the highest quality and is engineered for maximum power. Standard features include: Deep valve reliefs accommodate high lift camshafts; Larger valve reliefs for +1mm valve sizes; Custom skirt cam and barrel design; Accumulator grooves; High strength aluminum forgings; High performance rings; Fully CNC machined and balanced to +/- 1 gram; Wrist pins included at no additional cost; Double pin oilers force fed from oil ring groove; Pin lock grooves for easy lock removal; Pin fitting included.
| Product Name | Forged Pistons for Subaru, EJ257 WRX STI (stroker), 100mm, 10:1 (CP Pistons SC7443) |
|---|---|
| Brands | CP Carrillo |
| Engine | EJ257 WRX STI |
| Make | Subaru |
Delivery & Freight
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Product images are for description purposes only. Actual product may vary.
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If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
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 compression ratio for the SC7443 pistons?
The SC7443 pistons have a compression ratio of 10:1, which is suitable for performance applications in the EJ257 WRX STI, particularly when optimising for power and efficiency.
What are the specific machining requirements for the SC7443 pistons?
When installing SC7443 pistons, ensure that the bore clearance is set correctly according to your engine build specifications. Additionally, verify that the ring gaps are properly set as per your tuning requirements to avoid potential issues.
Can the SC7443 pistons accommodate high lift camshafts?
Yes, the SC7443 pistons feature deep valve reliefs designed to accommodate high lift camshafts, making them suitable for builds that require enhanced airflow and performance.
What is the weight of each SC7443 piston?
Each SC7443 piston weighs approximately 395 grams, which helps in reducing reciprocating mass and improving engine response.
What type of wrist pins are included with the SC7443 pistons?
The SC7443 pistons come with standard wrist pins (part number 905-2500-18CP1S) included at no additional cost. Upgraded and ultra-duty wrist pins are also available for those looking for enhanced durability.
