Forged Pistons for Subaru, EJ257 WRX STI, 100.5mm, 10:1 (CP Pistons SC7418)
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|
Make |
Subaru |
|
Model |
EJ257 WRX STI |
|
Part Number |
SC7418 |
|
Cylinders |
4 |
|
Bore (in) |
3.957 |
|
Bore (mm) |
100.5 |
|
Size |
+1.0mm |
|
Stroke |
79 |
|
Conrod |
130.5 |
|
Comp Height (in) |
1.208 |
|
Comp Height (mm) |
30.7 |
|
Dom/Dish CC |
-6.93 |
|
Compression Ratio |
10 |
|
Weight (Grams) |
440 |
|
Pin (mm) |
23 |
|
Rings |
RS1658-3957-0 |
|
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, 100.5mm, 10:1 (CP Pistons SC7418) |
|---|---|
| Brands | CP Carrillo |
| Engine | EJ257 WRX STI |
| Make | Subaru |
Delivery & Freight
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Disclaimer:
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 bore clearance for the CP Pistons SC7418 in an EJ257 engine?
For the CP Pistons SC7418, a typical bore clearance of 0.0015" to 0.0025" is recommended for optimal performance. However, this can vary based on the specific application and operating conditions, so it's essential to consult with your engine builder for precise measurements.
What type of rings are included with the SC7418 pistons?
The SC7418 pistons come with high-performance rings, specifically the RS1658-3957-0 set. These rings are designed to provide excellent sealing and durability under high boost and RPM conditions.
Can I use these pistons with upgraded valve sizes?
Yes, the CP Pistons SC7418 are designed with deep valve reliefs to accommodate oversized valves and high lift camshafts, making them suitable for performance builds that require such modifications.
What is the weight of the SC7418 pistons, and how does it affect performance?
The SC7418 pistons weigh 440 grams each. A lighter piston can improve throttle response and reduce reciprocating mass, which can enhance overall engine performance, especially at higher RPMs.
Are the wrist pins included with the SC7418 pistons, and what are the options for upgrades?
Yes, the SC7418 pistons include standard wrist pins at no additional cost. For those looking for enhanced performance, upgraded pins (part number 905-2500-20CP3S) and ultra-duty pins (part number 905-2500-26CP3S) are also available.
