Forged Pistons for Subaru, EJ20 WRX, 93mm, 8.5:1 (CP Pistons SC7401)
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|
Make |
Subaru |
|
Model |
EJ20 WRX / EJ205 |
|
Part Number |
SC7401 |
|
Cylinders |
4 |
|
Bore (in) |
3.661 |
|
Bore (mm) |
93 |
|
Size |
+1.0mm |
|
Stroke |
75 |
|
Conrod |
130.5 |
|
Comp Height (in) |
1.285 |
|
Comp Height (mm) |
32.6 |
|
Dom/Dish CC |
-9.5 |
|
Compression Ratio |
8.5 |
|
Weight (Grams) |
378 |
|
Pin (mm) |
23 |
|
Rings |
RS1313-3661-0 |
|
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, 93mm, 8.5:1 (CP Pistons SC7401) |
|---|---|
| Brands | CP Carrillo |
| Engine | EJ20 |
| 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 SC7401 pistons in an EJ20 engine?
For the SC7401 pistons, a typical bore clearance of 0.0015" to 0.0025" is recommended. However, exact clearances should be determined based on the specific build and intended use, considering factors like thermal expansion and operating conditions.
What is the compression ratio of the SC7401 pistons and how does it affect performance?
The SC7401 pistons have a compression ratio of 8.5:1. This ratio is suitable for applications requiring a balance between boost pressure and reliability, making it ideal for both street and moderate race setups. Higher compression can lead to increased power but may require careful tuning and fuel quality.
Are the SC7401 pistons compatible with upgraded valve sizes?
Yes, the SC7401 pistons feature deep valve reliefs designed to accommodate oversized valves and high lift camshafts. This allows for improved airflow and performance without compromising piston integrity.
What type of wrist pins are included with the SC7401 pistons?
The SC7401 pistons come standard with 23mm wrist pins. Upgraded and ultra-duty pins are also available for those looking to enhance durability under high-stress conditions.
What machining processes are necessary before installing the SC7401 pistons?
Before installation, ensure that the cylinder bores are honed to the correct size and finish to match the SC7401 pistons. Additionally, check ring gaps and adjust as necessary to suit your engine's specifications and intended use.
