Forged Pistons for Subaru, EJ20 WRX, 92mm, 8.5:1 (CP Pistons SC7399)
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|
Make |
Subaru |
|
Model |
EJ20 WRX / EJ205 |
|
Part Number |
SC7399 |
|
Cylinders |
4 |
|
Bore (in) |
3.622 |
|
Bore (mm) |
92 |
|
Size |
STD |
|
Stroke |
75 |
|
Conrod |
130.5 |
|
Comp Height (in) |
1.285 |
|
Comp Height (mm) |
32.6 |
|
Dom/Dish CC |
-8.15 |
|
Compression Ratio |
8.5 |
|
Weight (Grams) |
359 |
|
Pin (mm) |
23 |
|
Rings |
RS1313-3622-0 |
|
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, 92mm, 8.5:1 (CP Pistons SC7399) |
|---|---|
| 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 SC7399 pistons?
The recommended bore clearance for the SC7399 pistons in an EJ20 engine typically ranges from 0.0015" to 0.0025". However, it's crucial to verify this with your specific engine build and ensure proper machining practices are followed.
What compression ratio do the SC7399 pistons provide?
The SC7399 pistons have a compression ratio of 8.5:1, making them suitable for applications that require a balance between boost and reliability. Ensure that your engine's tuning and fuel quality are compatible with this compression ratio.
Are the SC7399 pistons compatible with high lift camshafts?
Yes, the SC7399 pistons feature deep valve reliefs designed to accommodate high lift camshafts and oversized valves. This allows for improved airflow and performance in modified EJ20 engines.
What is the weight of the SC7399 pistons, and how does it affect performance?
The SC7399 pistons weigh 359 grams each. Lighter pistons can reduce reciprocating mass, leading to improved throttle response and higher RPM potential. However, ensure that your engine's balance and overall rotating assembly are properly configured.
What type of wrist pins are included with the SC7399 pistons?
The SC7399 pistons come with standard wrist pins included at no additional cost. If you require upgraded or ultra-duty pins for higher performance applications, consider the options available such as the 905-2500-20CP3S or 905-2500-26CP3S.
