Forged Pistons for Subaru, EJ257 WRX STI, 99.75mm, 10:1 (CP Pistons SC7416)
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|
Make |
Subaru |
|
Model |
EJ257 WRX STI |
|
Part Number |
SC7416 |
|
Cylinders |
4 |
|
Bore (in) |
3.927 |
|
Bore (mm) |
99.75 |
|
Size |
+0.25mm |
|
Stroke |
79 |
|
Conrod |
130.5 |
|
Comp Height (in) |
1.208 |
|
Comp Height (mm) |
30.7 |
|
Dom/Dish CC |
-7.4 |
|
Compression Ratio |
10 FT |
|
Weight (Grams) |
439 |
|
Pin (mm) |
23 |
|
Rings |
RS1658-3927-0 |
|
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, 99.75mm, 10:1 (CP Pistons SC7416) |
|---|---|
| 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 SC7416 pistons in an EJ257 engine?
For the SC7416 pistons, a typical bore clearance of 0.0015" to 0.0020" is recommended. However, always verify with your specific engine build and tolerances, as clearance can vary based on factors like heat expansion and intended use.
What compression ratio do the SC7416 pistons provide in an EJ257 engine?
The SC7416 pistons provide a compression ratio of 10:1 when used in the EJ257 engine. This ratio is suitable for performance applications, but ensure your fuel quality and tuning are adequate to support it.
Can I use the SC7416 pistons with upgraded valve sizes?
Yes, the SC7416 pistons feature deep valve reliefs designed to accommodate oversized valves, including +1mm sizes. This allows for enhanced airflow and performance when using high lift camshafts.
What is the weight of the SC7416 pistons and how does it affect performance?
The SC7416 pistons weigh 439 grams each. Lighter pistons can improve engine response and reduce reciprocating mass, contributing to better overall performance, especially at higher RPMs.
Are the wrist pins included with the SC7416 pistons suitable for high-performance applications?
Yes, the SC7416 pistons come with standard wrist pins included at no additional cost. For even greater strength, consider upgrading to the Ultra Duty pins, which are designed for high-performance applications.
