Forged Pistons for Subaru, EJ20 WRX, 92.5mm, 8.5:1 (CP Pistons SC7400)
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|
Make |
Subaru |
|
Model |
EJ20 WRX / EJ205 |
|
Part Number |
SC7400 |
|
Cylinders |
4 |
|
Bore (in) |
3.642 |
|
Bore (mm) |
92.5 |
|
Size |
+0.5mm |
|
Stroke |
75 |
|
Conrod |
130.5 |
|
Comp Height (in) |
1.285 |
|
Comp Height (mm) |
32.6 |
|
Dom/Dish CC |
-8.9 |
|
Compression Ratio |
8.5 |
|
Weight (Grams) |
365 |
|
Pin (mm) |
23 |
|
Rings |
RS1313-3642-0 |
|
Ring Thickness |
1.2 x 1.5 x 4.0mm |
|
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, EJ20 WRX, 92.5mm, 8.5:1 (CP Pistons SC7400) |
|---|---|
| Brands | CP Carrillo |
| Engine | EJ20 |
| 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 SC7400 pistons?
For the SC7400 pistons, a typical bore clearance of 0.0015" to 0.0025" is recommended. This ensures proper thermal expansion and prevents piston slap during operation. Always confirm with your engine builder for specific clearance requirements based on your application.
What compression ratio can I expect with the SC7400 pistons in an EJ20 engine?
The SC7400 pistons provide a compression ratio of 8.5:1 when used in an EJ20 engine. This ratio is suitable for applications requiring a balance between performance and reliability, especially when using forced induction.
Are the SC7400 pistons compatible with aftermarket camshafts?
Yes, the SC7400 pistons are designed with deep valve reliefs to accommodate high lift camshafts and oversized valves. This makes them suitable for performance builds that include aftermarket camshaft upgrades.
What is the weight of the SC7400 pistons and how does it affect performance?
Each SC7400 piston weighs 365 grams. The lightweight design helps reduce reciprocating mass, which can improve engine response and overall performance, especially at higher RPMs.
Do the SC7400 pistons come with wrist pins, and what are the options?
Yes, the SC7400 pistons include standard wrist pins at no additional cost. Upgraded and ultra-duty wrist pins are also available for those looking to enhance durability in high-performance applications.
